I added TPU fibers to PLA to make it super tough!

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I wanted to find out if I could resize my old 3 mm filament into a modern 1.75 mm filament, which led me onto a journey of making custom multi-color filament with incredible details on the inside. This method also allowed me to create a sample of TPU-Core PLA filament that tremendously improved the impact properties of my printed samples, all made on rather in-expensive equipment. Let's find out more!
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Chapters
00:00 Introduction
02:00 3 mm filament to 1.75 mm filament
05:50 WInFiDEL Sensor
06:41 Sponsor
8:15 Using the WInFiDEL Sensor
9:14 Multi-Color Filament
12:50 My Logo in Filament
14:50 Multi-Material Filament (TPU-Core PLA)
16:41 Applications
17:15 Prospect
#3Dprinting #Filament #Engineering
DISCLAIMER: Part of this video was sponsored by Squarespace.
FTC Disclaimer: A percentage of sales is made through Affiliate links

[@CNCKitchen]

*QUESTION:* Which material combinations would you like to see and why? Want to get your 3D prints to the next level already today? Check out our Heat Set Inserts and Tools at cnckitchen.store (Free shipping worldwide starting at €100).

[@Some-nerd-who-tinkers]

Mix carbon fiber PETG with ninja flex TPU

[@eskanderx1027]

ABS + chocolate 😋

[@Some-nerd-who-tinkers]

Fiber glass composite pla 😋😋😋

[@RENATINHOBR99]

maybe PLA with a core of water soluble support like polydissolve, maybe to do some really light weight prints, insted of solid lines you will get tubes of PLA

[@lucasverocai1631]

This process can indeed open a path to multimaterial filament such as continuous carbon/glass fiber core embedded (inside an easy to respool material at first, for test purposes), the non strech fiber mechanical properties might be a hassle to deal with though... PA6/12, PC, TPU or Nylon for high end continuous fiber embedded filament, but might be even trickier to process. Anyway, good luck if you try this. Great video as always !

[@timseguine2]

"Yo Dawg, I heard you like layer adhesion problems. So I put layers in your filament so you can have layer adhesion problems while you're having layer adhesion problems."

[@ericwheelhouse4371]

You are having adhesion problems with pla?

[@timseguine2]

@@ericwheelhouse4371 14:28

[@djordjezivic2481]

@@ericwheelhouse4371 never under estimate a bad printer (my 2018 wanhao duplicator i3)

[@stevrgrs]

So basically you’re doing what candy makers have done for over 100 years :P 😂

[@comethiburs2326]

@@stevrgrs candy makers dont make candy with two different plastics and different melting points. Stuffed candy is generally coated or injected, as for hard candy it's rarely if ever done with a mix of, let's say butter based caramel and hard candy, as the butter caramel would leak out of the strip before it hardens, ruining the pattern. Irony or not it's apple to oranges. he's right about temp differentials being a problem with multimaterial printing.

[@mannycrafts]

Wow, this is insane. Mans maxed out his engineering level and just grinding sidequests now.

[@Some-nerd-who-tinkers]

He’s completed the CNC part of his username and will soon begin the Kitchen stage. Edit: tbh he’s already cooking

[@hyozanhades09]

He is manufacturing a new reality for earth in his kitchen !!!

[@ameliabuns4058]

Lol

[@drummerboymaddux]

😂😂

[@brandonsaffell4100]

If you think our man has reached his final form you underestimate him.

[@dittot]

Roughly every year or so, someone makes a completely game-changing 3D printing video showcasing an inventive new way of doing things which could open up so many new possibilities. This is one of those.

[@StarkRG]

And at least a third of those seem to be done by CNC Kitchen. How many of the things Stephan has showcased over the years have become standard practice?

[@TD-er]

Yep I was wondering which 3D printer manufacturer is also watching this and thinking to add a filament-diameter scanner into the printhead to be able to automatically compensate for under/over extrusion during printing. Maybe this is even more important for flexible filaments to get a really consistent printing results?

[@givemeanameman1]

Its interesting, but its already being done... Continuous Carbon Fiber filaments for high strength parts for example. "fiber" filaments rarely have increased strength, because the fibers have to be chopped up so small that they don't do much. So Continuous Carbon Fiber filament and the like were invented to change this. The game changer is being able to make multifilament at home, even as a proof of concept.

[@whatevernamegoeshere3644]

I work maintenance in a cable factory. The first 5 minutes of the video were pretty much most accessories of an extruder re-invented lol. You should really look up Kabmak extruders to get some inspirations because there are things like vacuum attachments and straightening rollers that could be added even to your machines. You could also add a mechanical brake to the pay-off spool to add pre-tensioning and it would make the plastic more consistent as it would feed through straight. The rollers serve the same purpose, but for wobbly lines. Another important addition would be a hot air blower to pre-heat the filament so you couldn't have to run a volcano type nozzle or anything special. You would need a lot less forces on that filament if it went into the nozzle already at say 50C. As for what you could be adding to it? Oh boy! Make 3 separate filament pay-offs with U-shaped "shells" on 2 of them and one filler. You could just add nylon strings or fishing line to the center spool and print multiple times as much filament at once. Hell, add a caterpillar-type tensioner brake to it and you're gonna have time to change filament on the go without interruption if you find a way to weld them in between.

[@jakeharms1386]

Thank you so much. This is exactly what I wish every comment on KZbin was like

[@shawnalfaro6943]

I agree with all of these suggestions! Preheating the filament is a great idea, even with something simple as a halogen light bulb. And the roller suggestion is also great!

[@audioman81]

Preheat the filament too was first thing I thought when he was struggling to pull it through too. Can't believe he didn't think of that when he was basically already doing that to stretch down in size to insert it.

[@bastienx8]

Just putting a hot air blower or halogen lamp at the entry is not very energy efficient, for a process that takes hours this is something to consider

[@sementhrower420]

Off topic, but I think you might be the right person to ask this, if you don't mind helping out a random internet stranger :D I'm working on creating coaxial nylon-nichrome wires where I want to embed a nichrome wire in the core of a nylon monofilament line. The ultimate goal is to achieve this with 0.1mm D nylon and 0.01mm D nichrome wire, but I'll first try to do it with larger D nylon. What Stephan built here is roughly what I am also planning on doing, and in addition also feeding the nichrome wire through the core of the nozzle. Do you think this would be workable and do you have any tips? Thanks in advance!

[@OldCurmudgeon3DP]

Hard candy is made in a similar fashion. All the design is created in a large (8-9" diameter) chunk then stretched into the final bite-size form. The pattern is retained through the stretching process same as with yours.

[@EFLO3D]

Same with “millefiori” glass art.

[@benjaminvdvyt]

This was the first thing that came to mind. Watching how candy is made, is extremely similar and follow the same principles.

[@OG-ProfessorFarnsworth]

His old video about the PC core ABS he mentioned actually talks about the same thing. I believe the original researchers made large blanks with the desired pattern that they then had a machine to extrude into a filament. Exactly what you’re thinking! But requires specialized equipment. Assuming I’m remembering correctly! 😅

[@wakafeek]

Beat me to it! I was about to say this is how they do designs in saltwater taffy too

[@dooleve]

Funnily enough, this is mentioned in the subtitles at 13:58, but he doesn't say it out loud

[@lescarneiro]

This TPU core experiment is just GENIUS! That's why I love your channel, you do science with your experiments, not just funny things for likes and subs

[@danilolattaro]

Absolutely genius!

[@zackj997]

Why a solid core instead of the TPU and PLA emulsified together? People already use silk PLA for flexibility in certain applications since it already has TPU in it.

[@rich1051414]

@@zackj997 The solid core unmixed turns it into a composite. When you have two materials with different properties together, their strengths can add together in ways that wouldn't if they were thoroughly mixed. In this case, the flexibility of the TPU functions like dampening rebar, preventing fracture propagation while preserving the stiffness that PLA offers.

[@ronnetgrazer362]

@@zackj997 Really? Most of my silk prints seem more brittle, not less. I'm a sucker for off-brand budget filament deals so that might be a factor.

[@kbee225]

It sounds genius if you know very little polymer science. PU and PLA are not chemically similar so they form what we call non-compatible blends. These blends are basically those that cause boundary layer separation because the two materials are not chemically bonding with each other, this forms a weak material that is worse in most aspects than the homopolymers themself. This is why when making polymers blends with dissimilar materials we use compatibilizers to act as a glue and bind both the materials together.

[@ac281201]

4:13 This phenomenon is actually a result of two combined effects: necking and strain hardening. When tension is applied to the nylon filament, it begins to undergo plastic deformation at its weaker points, leading to a reduction in diameter. At the same time, the nylon string strengthens in these areas of reduced thickness, which concentrates the strain on the thicker segments of the string. The combination of these effects causes the string to shrink to a new, constant diameter before ultimately breaking. Articles for more information: en.wikipedia.org/wiki/Necking_(engineering) en.wikipedia.org/wiki/Work_hardening

[@miqo85]

aka continuous necking

[@hugofernandez8522]

It's kind of right but not quite, the effect is due to the majority of the chains in the polimer getting aligned and because all the chains are in the same orientation they become stronger

[@hugofernandez8522]

In amorfous materials like polymers you don't have strain hardening like in metallic materials

[@ac281201]

@@hugofernandez8522 Yes, you are correct, in the case of polymers this effect is the result of chain alignment and not crystal shifts like in metals, but still, this effect is called strain hardening (or work hardening) in both cases

[@louisvaught2495]

As others have mentioned, this is not work hardening, it's chain alignment. No, they are not the same thing. Work hardening is a crystallographic behavior (polymers do have crystal structure) while chain alignment is just generally the idea that you can do things to the material that cause the long molecules to be oriented in roughly the same direction. Chain alignment doesn't require work-hardening because polymers are viscous and have huge molecules. Things like melt-spinning can also cause higher chain alignment. Chain alignment also doesn't have to interact with the crystal structure of the plastic, and happens even in amorphous materials. It's just about the average direction the polymer chains are oriented.

[@tomallo99]

That's insane, really, creathing a visible logo INSIDE of a filament spool, with hardware that's DIY and accessible to a hobbyist? Man, you just keep on delivering bangers, your ingenuity is amazing

[@XVRickXV]

You could think of the TPU as muscle and the PLA as bone and have them switch places. The tpu absorbing more impact on the outside and the PLA receiving less shock because of being shielded by the flexible TPU the same way that flesh protects bones most of the time. Awesome experiment!

[@lickytime9683]

The outside of the filament would also be bending more than the core, so having the outside made of tpu must be beneficial too

[@cfeigel]

The WInFiDEL sensor lets you measure filament diameter. Now you can implement a PID loop to automatically figure out the proper temperature at a given speed. If you want faster production, turn up the speed and the PID should correct for the change.

[@AndrewAHayes]

This is why I love this channel, most of the other channels I used to watch are either all doing Voron builds or reviewing the same printer that's been done a hundred times already. This channel is unique!

[@kylebuffington7673]

So many new ideas continue to pop up in 3D printing. Non-planar printing, arc overhangs, and now you are showing off multi-material filaments. Ten years from now, 3D printing is going to be absolutely off the charts.

[@lukesmith9059]

I would love to see more videos on metamaterials! If the stiffness of the tpu-pla is close to normal pla it would truly be the king of all printing materials for parts that don't need high temperature resistance.

[@not2unknown1]

A PLA core with a water soluble PVA mantle could create interesting structures or grids when you print it and put it in water. Kind of like how aerogel is made, but bigger.

[@ziocrielo6148]

3d printed sponge lol

[@paulpoleon8570]

Aero light plastic for rc plane wings or something

[@ericbuchner2982]

Unfortunately with the constant cross-section shown in the video I don't think this would give useable results. The core never bonds to itself, so if you dissolved the outer layer the entire print would just fall apart. It might work if you could vary the cross-section so the core sticks out in places, but that would be much harder to get working.

[@markswayne6326]

If you printed it with stripes of PVA that are diagonal edge to edge but left solid PLA layers between, the PVA might be able to dissolve out while leaving behind a structure that wouldn’t come apart.

[@Avets610]

Always pushing the limits of 3d printing, great job. The watermark filament honestly blew my mind.

[@SamChaneyProductions]

This is one of the coolest advancements in consumer 3D printing tech I've seen in a long time. What a great innovation. Even as a mechanical engineer I'm a little surprised how well you got this to work with such a simple setup, especially getting such disparate polymers into a single filament!

[@loganluckless372]

I work at a company called Hills inc. where we do cross section logo fibers and other wild multi extrusion projects. Cross section logo fibers like that are used a decent amount in industry by basically making a dot matrix on the core of each fiber and routing the colored polymer to it's place in the matrix.

[@janbeck8269]

How about filaments with an embedded cf or Kevlar strand. Is that done?

[@domkri9502]

Every time you publish a Video it takes two days and your content is featured by all the 3D printing/ Maker Websites, this is amazing. Thanks for your R&D work and making it open to use for everyone Danke 🎉

[@FTBT3D]

That TPU/PLA is so cool! what a great experiment

[@MarcStollmeyer]

Embedding your logo in the filament is such a flex and extra way of tagging your prints as genuine.

[@capslfern2555]

I love that, watermarked 3D prints

[@lucianoag999]

Except that everyone can do it.

[@TurboSunShine]

Oh god i was so young back then... excellent technique! love the 4mm to 1.75 downsizing!

[@skelliton_67]

The nylon string reducing in diameter when tensile force is applied is called "necking". I got this definition from google, "In engineering and materials science, necking is a mode of tensile deformation where relatively large amounts of strain localize disproportionately in a small region of the material. The resulting prominent decrease in local cross-sectional area provides the basis for the name neck."

[@JakeWitmer]

Can this be modeled in a bottom-up simulation?

[@swissfreek]

Your videos are always amazingly thought-provoking. You come up with truly innovative concepts for investigation that no one (or very few) have talked about. I love it.

[@arcrad]

Dude you are the GOAT of 3d printing experiments. Is there anyone else out there doing stuff as cool?

[@TheToelle]

A CNC-Kitchen Video 🎉 my Evening is saved.. Why my evening? Because each one of them teaches me enough to continue reading for hours… thank you!

[@MrTree421]

You have really outdone yourself with this video. The research you have done in this video is easily enough to write another master thesis. Outstanding!

[@Markfps]

What a crazy idea PLA + TPU core, amazing job man! This is surely a neat improvement for prints that will face a lot of physical stress

[@thomasleftwite]

You are a pioneer in expanding the possibilities for 3D printer users.

[@umikaliprivate]

I dare you to print on a regular fdm 3D printer using solder. I mean it would be liquid af, but if you could cool it fast enough, this could be revolutionary.

[@properprinting]

Man, this is genius! The most interesting use case I've seen for the Prusa XL and this really inspires!

[@fearlessmangoose3118]

Amazing proof of concept. I love the macro shots in this video !

[@greenboy3d]

What a coincidence that we both made a video about mixing TPU with PLA at the same time hahaha 😅 But I was a bit faster 🙃

[@Craftlngo]

Upvote for more awareness. Your idea to mount a corkscrew extruder on a 3D printer could be a real game changer!

[@mr.shplorb662]

Not to brag or anything

[@csforesman]

Wow. So glad I saw this comment and went to check out your channel. As cool as the idea in this CNC kitchen video is (and no slight to Stefan, this really is a great idea), I think your pellet extruder has way more potential to revolutionize 3d printing. Amazing work.

[@Nachtschicht1]

I've recently seen your video about that and I think you deserve a lot more attention. What would you think about about combining your idea of direct printing from pellets with Stephan's filament-extruder and Thomas' thickness-sensor to regulate the speed of the extruder to match the amount of filament that the printer needs to build a printer which makes its own filament on the fly? That would solve the problems with the much heavier printhead and reduced printing-quality.

[@greenboy3d]

I think this idea might work, there are also ideas like implementing a real-time pressure sensor or AI camera to measure the flow and to automatically adjust it in real time. The only thing that needs to be done is the research & development which is costly and since I have spent most of my savings on R&D for the extruder itself... For this reason I keep all these things in mind but for now focus on releasing the extruder so everyone can benefit from it... 🙂

[@peterkiss1204]

I would drill that nozzle up to at least 1,8-1,9mm and pull the filament at above the breakpoint of the diameter/pulling force curve to achieve correct diameter and fuse the layers together properly. Also a loadcell controlled motor driver circuit would help keeping the pulling force constant.

[@elongatedmuskrat5170]

This effect is called necking. It comes from the alignment of polymer chains. The modulus of elasticity of the material also greatly increases when necking occurs as the aligned chains creates higher crystallinity. This can also occur in multiple steps of necking down the diameter until the stress required to force the diameter down via aligning the chains further is greater than the yield stress of the filament at that point. PS: as a polymer engineering student, i love your videos.

[@supercurioTube]

This is absolutely amazing, I'm so impressed with what you came up with, so creative and well engineered at the same time. You ended on what you would try differently after exploring the reforming method and I can't wait for the next step.

[@DrakeTain]

Now that is neat.

[@martinsmith2948]

Babe wake up! CNC Kitchen just uploaded

[@sapuseven]

I love the amount of innovation and experimentation in videos like this.

[@wruehl]

Love to watch you push the envelope in a meaningful way!

[@sephrosemary]

Imagine finding a way to embed continious carbon fiber in a filament this way!

[@UnCoolDad]

This exists already in the high end commercial printer world.

[@olafschermann1592]

Yeah, thats the way! And opensource it

[@sleeptyper]

I have an idea. Make the filament have a clear core with transparent coloured shell, print a cool vase model on vase mode and find a way to send light thru the extruded filament. Maybe one of those 60mm LED pucks from eBay under the vase would do it. On the other hand, a black core with transparent shell could be very interesting as well.

[@justintoleos]

wow. packed with so many amazing concepts. Thank you CNC Kitchen!

[@majorredbeard]

The amount of time that you put into these videos is truly astounding. Thank you so much for all of the dedication you have to 3D Printing!

[@startedtech]

If its ever sold that TPU/PLA combo should be named Wagyu beef!

[@Dwonis]

Having a flexible core and a hard surface is what makes teeth so tough... so it could be called Wagyu Teeth! 😂

[@TheOneAndOnlySatan]

And again Stephan changed the 3D printing world again! What a legend!

[@mikepujols]

This is some amazing stuff!! Just fills my head with sooo many ideas! Thank you so much for spreading your insights! theres still so much to learn!

[@Bob-qr9se]

Congrats on reaching the next level in 3D printing! Love your ingenuity ❤

[@jkachele]

Hexagons are the best-agons! CGP Grey Reference!!!

[@ouansungyidan]

Omg he made his own metamaterial at home. Kind of freaking out right now. That's a research gold mine.

[@louisvaught2495]

It's not particularly useful due to the high shear during production. That imparts unfavorable structure on the material.

[@ouansungyidan]

@louisvaught2495 That's a great point, the production method can be improved. But the concept is still amazing. Hobbyist accessible metamaterials. That's still got me excited.

[@louisvaught2495]

@@ouansungyidan You can work a bit to remove the molecular alignment, but in general the process being used to *make* the structure is what limits the final properties. This particular process being so accessible and macro-scale means you don't have much molecular control over what's coming out. The part of the video where Stefan discusses having to keep the filament from getting too soft is a great indication that the process is really dependent on the molecular order of the polymer, rather than the process having any control over it.

[@Alluvian567]

This is so cool. So glad you did this, as I do not have the equipment, expertise, or time to do something like this. Amazing.

[@EXAPHI]

Keep innovating Stefan, you're one of the main drivers helping to push open source additive manufacturing towards the future

[@stevvieb]

You got 4 halfs, I got 4 quarters, :)

[@ChrisHarmon1]

The wilder the hair gets, the better the engineering?

[@falxonPSN]

This is quite possibly the coolest video you have ever made, and that's saying a lot! Wow!

[@spacedbro]

Legitimately amazing work as usual!!

[@Bbluenight]

mind blowing, very cool tests! keep up the good work and thank you for sharing :)

[@benrr101]

This is pretty cool! It's basically the same process confectioners use to make candies with logos and stuff in them, although they start with blanks like 10" in diameter and stretch them down by hand. Still very cool that this technique applies to plastics, too

[@jonbondy]

Wonderful and amazing innovation and creativity! Kudos!

[@Greg-J]

This is probably the most impactful 3d printing video of the year and and it's just chilling in our feeds.

[@BakeBakePi]

Thats so cool! Great video!

[@mckesn]

Every topic is wonderful and incredible, I really enjoy your videos, they give me ideas on many things, thank you.

[@jakubruzicka1686]

Such a cool and unique idea. Well done.

[@nickrudd2568]

You have the patience of a saint my friend. Top experimenting, Keep it up Sir.

[@HerbanWarrior]

That twisted 2 color where the colors shift is pretty awesome, that effect with another color could be really cool

[@capslfern2555]

im going to try this, looks cool

[@357Maxim]

I really like your videos and the R&D-oriented mindset. Great engineering !

[@farfadet46]

Wow amazing work here ! thank you so mush !

[@jeffharrison5265]

That was super interesting! I think you're onto something here with the TUP/PLA. Hope you pursue this further and provide some updates. Thanks.

[@willofthemaker]

Yoooooo this is amazing. So many possibilities! Can even make longer rolls by fusing multiple coils together by melting hem together. Then the resizer does it's magic to smooth out the joint

[@dgriff4000]

Outstanding research. Bravo!

[@MrDivinePotato]

Very cool, that TPU core PLA is awesome

[@mattelder1971]

I would love to try some of the TPU filled PLA to see how well it works in some unusual applications. It almost sounds like the ideal material for high impact prints.

[@albynton]

This is kind of crazy. Great work!

[@SixOThree]

I don't have any suggestions but I can say this has been fun. Hopefully you will do a little bit more of this!

[@UnexpectedMaker]

This was super cool. Great perseverance to keep at it until you got each combo to a workable level.

[@TrippyRiddimKid]

I recommended you do this a while back, not sure if you saw my comment or not, but Im glad some testing is being done, I dont have the equipment to do it myself.

[@dalerogers1134]

Impressive! Excellent work.

[@orephen]

Super intresting thankyou for the hard work.

[@ZILLION4EVER]

wow one of you best ideas in the last years ;) talking about creativity and thinking outside of the (spool) box :D

[@ericserafim7954]

What a intense video. Great job dude 😎

[@android4cg]

Wow! Really great video!

[@beonyou]

Clever research ! Multi-material point is brillant ! 👍

[@charleseast2740]

stephan, this is phenomenal, I've been thinking about a way to get around the markforged patents for a while. I consistently enjoy watching your videos, i really like how thorough you are.

[@GabrielAmyot]

Thanks for the awesome research

[@DavidCook42]

This was super cool ! Thank you

[@klazzera]

the phenomenon is yielding and chain alignment. when it stretches to the point that polymer chains are fully aligned, it reaches a higher modulus and strength and stops being the weak point so the thicker sections continue to stretch

[@jetblackstar]

This is just like a stick of rock, and how a lot of polymer clay art works. Very cool. Especially from a cottage industry researcher! The tpu/pla matrix blew my mind.

[@MitchDavis2]

Had to check out this video after talking to you at RMRRF. This is super cool, now I'm going down the rabbit hole of what it would take for us to produce something like this at scale here at Polar Filament

[@garagemonkeysan]

Excellent research. Fascinating! Mahalo for sharing! ❤

[@CDRaff]

I really like the twisted multi-color filament.

[@TeamMSound]

Was für ein Heftiges Projekt ! super Video !

[@SeabornNomad]

Stefan (i'm sorry if i spelled it wrong.) you are a wonder worker. i've loved your content, it's always interesting, helpful or great applied research and development if you ask me. You're a printing scientist.

[@deliziosetiefkuhlkost2463]

Please do a dedicated video about the strength and toughness of some filament combinations. I am definitely interested in the mechanical properties and think that it could lead to some promising future filaments

[@RolandKnall]

This is just crazy and unbelievable cool! I think Filament recycling will become more affordable quite soon as a side-effect of more and more such videos popping up. But in any case, as an Austrian: saugeile Technik!

[@Jhongerage]

This is fantastic, there is so much scope for new printing materials. Also interested in additives in the process that are genuinely useful (unlike milled carbon fibre!). Microballoons for a start

[@Phreakrider]

Stefan here again with a leading edge video. Mind blown!

[@PLr1c3r]

There's so many interesting possibilities mixing different materials within one extrusion. This is definitely one of those ah-ha moments for the technology. CF Nylon with TPU or ASA with TPU could make interesting case studies. Delving further in mixing multiple materials to harness more properties is another product of these types of explorations. GJ Stefan always keeping us on our toes!

[@erokfussell]

A couple of weeks ago I printed a TPU/PETG filament. It worked great for the printable balls! Improved bounce compared to TPU and much more durable than PETG.

[@FlippinFunFlips]

Dude, I find this extremely interesting. You're a cool guy.

[@jacobhgoldman]

I love the update with an older experiment I think it would be cool to pull long strands of each material and line them up to form a pattern as a practical mass production setting. Also I think the thinning effect you talked about in the beginning is called strain elongation