Making a bolt with ZIGZAG threads - SO STRANGE! - Lost PLA metal casting

In this video I will be making a bolt with unique zigzag threads. I started this project by 3d printing models in a plastic called PLA. Then I coated the models 10 times with a ceramic material called Suspendaslurry. After the ceramic shells were completely dry I placed them in my kiln and melted out the PLA plastic. At 1500 degrees Fahrenheit the ceramic shells became vitrified, turning into a ceramic that can withstand the heat of molten bronze. I melted the bronze in my homemade keg foundry furnace and then poured the liquid metal into the ceramic shell molds. This is similar to the lost wax casting process.
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All of the links above are affiliate links. This means that, at zero cost to you, I will earn an affiliate commission if you click through the link and finalize a purchase.
------ 3d printed versions ------
I plan on selling 3d printed versions of the bolts shown in this video. I'm am working to set up a website and sell them as soon as possible. Please check here soon.

[@robinson-foundry]

Hey! I hope you like the video! Have a great weekend everyone! 🍻

[@JamesMiddletonIV]

Great casting and, as usual, video was very well made!

[@xiiipetotec1282]

I've been trying to tell creators about making concrete bullets but no one seems to listen if you could make some by casting them in silicon and then pressing them down on a casing and giving it a test fire from a far that would make a great video that not one person has thought of doing on youtube

[@evilcanofdrpepper]

It would be cool to make something like that but make it look like the brass nuts were captive by sticking another bolt head on the end. You would probably have to do some tests and set up the threads perfectly though if you wanted them to both line up perfectly on the end. I guess I would recommend threading a hole down the end of the bolt and then making the "nut for the other end just a bolt with a much smaller threaded part. If you leave a slight ring around the end of the threads and make the part so it doesn't quite line up with the other nut you can get the bolt up to tension by tightening it properly or by thinning the screw on end slightly until it lines up perfectly.

[@SkyValleyStuff]

NEVER GO BACK AND FORTH WITH A FILE!!!

[@WhiteSn95]

@@SkyValleyStuff Hey that guy has shown up. No one cares dude.

[@felixjamieson8356]

you should definitely make two of these with the ends cast together so that you can just flip it over and the nuts flow down to the other bolt. like an hourglass! love your videos and designs

[@justdontgetit7481]

Great addition to the og design. I'd buy one.

[@jamesknight1987]

Dude thats a sweet idea, I was thinking its great until you lose the nuts but yeah if add another head on the other end then its like an hour glass, genius, I'd buy one!!!

[@B0redZer0]

The way to do that would probably be to make it so that the bolt is split into two part which are then screwed together.

[@EliteBeast]

The 10 second bolt timer. Lmao

[@fyyq2906]

@@B0redZer0 yeh, it would have to separate in some way as you couldn’t cast the bolt with the nuts on, or you could just weld another head onto it and clean it up to make it appear a single piece

[@johnscustomsaws]

I worked in a ductile iron foundry for 7 years and was head of the "Melt Department" and I gotta say... That's the nicest lawn I have ever seen 💯

[@nidavis]

my lawn looks exactly the same, we must have bought our astroturf at the same place!

[@NoThing-ec9km]

Lol😂

[@ahobimo732]

There are some pretty impressive crafting skills on display here. Casting metal parts in your own back yard is no small achievement. And the results are more detailed and flawless than any manufactured casting I've ever seen. So yeah, my hat's off to you. Fantastic work.

[@aminaghaii5522]

honestly, from the middle of the video, I was wondering the same thing and was more interested in hear the tip about the manufacturing process

[@melody3741]

@@aminaghaii5522 the reason its so good is purely from the ceramic slurry. Its absolutely mindblowing stuff. Those sand marks on commercial castings are a thing of the past now.

[@ic7846]

My dad has a foundry and this is his exact workflow only with statues 5 times as big (sometimes less sometimes even more). Edit: He uses wax instead of plastic and some of the materials for the casts are different as well. But the process is mostly the same

[@sknopster]

The foundry process goes back ~6,000 years. The process your dad uses is called investment-casting or lost-wax casting... essentially referring to the loss of (labor + materials) invested in the positive pattern used in the mold making process.

[@chriscobble48]

I'd love to see a version with a bolt head on both ends, so you could just turn it back and forth and never have to worry about losing a nut. It would be a great desk toy for sure!

[@ettenoiram8653]

Or a bolt head cover so you can take the nuts out if wanted

[@salemj1371]

Hehe loosing a nut

[@marlonmohninger4595]

Kinda of cool but what would be a real world application to this?

[@GUDboi25]

@@salemj1371 😏

[@scgizmohd6735]

@@marlonmohninger4595 my thoughts exactly

[@stowphysics]

I'm a physics teacher and the first thought I had watching your end products was just how good of a demonstration it is of rotational momentum. Nice work. I doubt you would get a similar effect with your plastic 3D printed versions since they have such low mass. Although, I suppose glueing some rods to the nuts would add enough rotational inertia to make it happen.

[@eklhaft4531]

Yes and maybe place the plastic bolt on ice. Then I don't know if it works but maybe use oil to lower the friction between the nut and the bolt.

[@WeebRemover4500]

you could definitely massproduce this using powerful spotwelder, or brazing the opposing threads

[@davidswanson5669]

@@WeebRemover4500 maybe the various cut threaded rod pieces get hollowed out and then just friction fit a solid rod down the middle like a skewer.

[@WeebRemover4500]

@@davidswanson5669 or frozen down in liquid nitrogen and left to heat up so the metal expands

[@StrokeMyLovePump]

I'm a physics professor (A hazardous tree removal expert)

[@ahmedosman4658]

İ had an exam yesterday about manufacturing techniques and was watching videos on KZbin. This feels like the algorithm rewarding me

[@fmillz]

I’ll 100% buy one !! I’m a machinist/programmer on CNC machines in the aerospace industry so this would be absolutely amazing to have as it is so well made that it looks machined.

[@rodyates1]

Absolutely fascinating, Glad to see your wife was keenly involved by contributing her good saucepan for cooling down the castings.

[@codeman99-dev]

That's a dutch oven. A saucepan is called a "pan" because it is a very shallow pot.

[@sayyamzahid7312]

I live in Karachi Pakistan and I like your comment if you don't mind

[@sayyamzahid7312]

@@codeman99-dev I live in Karachi Pakistan and I like your comment

[@cumjesus]

@@sayyamzahid7312 ;-;

[@ethannelson3555]

@@sayyamzahid7312 ;-;

[@Verlisify]

This is so cool its hard to put into words. It would be cool if you started a Kickstarter to sell factory mechined desk toy versions

[@aarronwootton]

I'm a CNC machinist, and it would be fun to produce these

[@VaporSpaceNumber101]

Agreed. They would definitely be a hit

[@TheMilitantMachinist]

@@aarronwootton You thinking 60deg chamfer mill using live -tooling to get these done?

[@vincedibona4687]

Welp, the enginerds have shown up… 😂😉😜

[@TheMilitantMachinist]

@@vincedibona4687 how dare you call me an Engineer?! I am a proudly underpaid machinist doing the donkey work for engineers 😂😂

[@Frosty_tha_Snowman]

4:51 that might be the most satisfying "pour noise" I've ever heard in my life. It should be used in videogames and movies.

[@Kam3L8]

I'm happy as a little kid to see the whole project. From the plastic model, through the metals processing, finishing of the components, up to the end, with so satisfying movement of bolt and "nuts". Great job done and the video also.

[@anindyaroythetechmaster]

I see why you quoted the "Nuts" 😏

[@95TurboSol]

This guy is a casting master! I've seen so many videos of people trying to cast metal and it's so freaking hard, you nailed your technique on this

[@SuprSBG]

Master Caster

[@JayMaverick]

Amazing how well your castings turned out. The sharp edges especially, totally didn't expect that.

[@ryankiesow8440]

Helps by preheating your molds

[@aayamrai1215]

What if You make 1 with variable thread lengths...so when the nut moves over it and changes directions it'll sound like some musical tone✨ Really loved this process and the final thing❤️🔥

[@m16fermy]

Probably one of the best castings I've seen

[@peanutbutterbean1738]

I would actually pay copious amounts for exact, full metal copies of this

[@swampwiz]

I'd pay a more modest amount, but I'd like one too.

[@regmus]

The ting it makes every time a nut switches directions is just absolutely exquisite and brings me great satisfaction every single time. It sounds like you have just achieved or unlocked something truly astonishing in a video game when it makes the sound. I do truly hope that you would sell 3D printed models of these because I could and would play with these all day long.

[@suzyrottencrotch5132]

Yes extremely useless but looks funny

[@NickRanger]

It's nuts

[@z0uLess]

I love watching people do things. It makes me feel that I am doing things myself and that my life means something.

[@AngelOfMorning]

This man can make gold with just printer if he wanted to. Bravo!

[@pattimessenger6214]

Wow! I’m really impressed with how intelligently designed this thing is, and how well you crafted it! Thank you for sharing!

[@nathanwarkentine9538]

all just to annoy his wife 😂

[@insanebmxthomas]

I don't think i've ever seen such flawless execution on a project. Awesome!

[@BELLE_MYMAIL1]

This guy has the most amazing tools and knowledge of his craft!

[@316ksopha]

Videos like this is what deserves views, not the ones with people using other people's videos and just showing they're facial expressions.

[@DEWILL]

The end result was omega satisfying, not only eye candy for engineers but also ear candy. What a cast.

[@B_assMan]

Did not expect you to be here, *_A surprise to be sure, but a welcome one._*

[@SilverCymbal]

Your channel is destined for mega greatness! Your skills are beyond next level! Well done!

[@zacksrandomprojects9698]

Hey I watch your stuff! You have a great channel too! 🍻

[@Ruhrohraggy10]

I hope he becomes the next grant thompson, i wanna see videos like that again

[@Ruhrohraggy10]

@Seven Inches of Throbbing Pink Jesus bro wtf? It ain’t that deep

[@Ruhrohraggy10]

@Seven Inches of Throbbing Pink Jesus bruh wtf 😂 why are you so toxic

[@Ruhrohraggy10]

@Seven Inches of Throbbing Pink Jesus ok?

[@XxFunkMachinexX]

I'd buy one in a heartbeat. Great job and excellent craftsmanship!

[@Victor17]

But why ?

[@zachrichard7039]

The impressive part is that the casting worked the first time, you made it look like an easy process.

[@WzzupDaAwsome]

I love how it's so smooth that gravity is enough to thread the nut on. I wonder what the fastest angular velocity you could achieve would be - maybe a variable pitch thread? Starts out steep to get some speed an initial rotation, and ends in a very shallow pitch to ramp up the rotations.

[@jb76489]

A brachistochrone is the fastest way to do that linearly, my head hurts thinking about trying to translate that to a thread pitch

[@QziQza]

that makes me think of The Corkscrew ride, at Alton Towers lol.. turn that in its end, straighten it out, and put it atop a skyscraper, and we could make your idea a hairy ride.. ..bugger, I'll be thinking about this for days now, and I don't even like rides that whirl you around..

[@jb76489]

@@darrenmiller5403 that’s why you use ball bearing instead of threads on the nut

[@dieseldabz7104]

It's definitely neat, BUT what's the point??

[@QziQza]

@@dieseldabz7104 how often have you been asked "what are you thinking about?" and responded "nothing" This is what happens when you engage with something that crossed your mind, and choose to act upon that very question. This is why we have everything we have. Sometimes we create things from specific need, other times we create, or play with ideas, that we eventually find a need, or use, for.

[@SME_Ste]

Amazing quality on the finished product. Never mind selling 3d printed version, i’d be more interested in the cast version👍🏻

[@calikat5968]

I’d say the process is too time consuming and extensive for him to make profit with it

[@lukedoran8735]

Definitely.. I want one!!

[@dangriffin303]

Agreed. Sell cast versions and I'll buy.

[@Choober65]

That is some next level genius, from one Engineer to another

[@LolkeDijkstra]

WoW. I'm totally blown away by this. What ingenuity and craftsmanship.

[@GoingtoHecq]

This thing came out so cool. Amazing. I didn't expect the bolt to get spun at every direction change but it makes sense.

[@tbjas]

You're one of the few people on the internet i've seen using the whole length of a saw and/or file instead of just using the center 10%. EFFICIENCY! The bolt and nuts are nice too!

[@papulover420]

Kinda sad statement

[@tbjas]

@@papulover420 Huh why is that?

[@dieseldabz7104]

I don't know about videos, but in real life totally agree. Almost nobody uses the entire length of any saw blade or file, and usually use them wrong as well like running file forward AND backwards like sanding something. NOT the way to do it and usually why takes much longer to achieve the proper results

[@dennisranck1613]

When I clicked on this video, I did not know it would be as enjoyable as it was. This was an awesome video and a great idea I did see one of the comments that had mentioned something about a double-ended bolt with a nuts sealed if you will in the center. This way, you can just turn the bolt upside down or downside up and have them nuts spinning.

[@bar3lyalive769]

The noise the aluminum makes when you're pouring it into the mold is soooo satisfying 🤤

[@patrickrussell4001]

From a machinist standpoint, this is the coolest thing I've seen in a while. Keep up the good work.

[@carlsjolund2379]

That aluminum bolt looks absolutely stunning, I did not expect a cast to look that good!

[@mazsolt21]

This example is just the beginning :) - I love this 2 technology and the finishing with 5ax milling. Everyday i can learn anything new.

[@JACK-wh6jl]

VERY RESPECTFUL OF YOUR CRITICAL THINKING TO PRESENTT A FINISHED PRODUCT THAT ROCKS ! BRAVO

[@johnreiland9180]

It's rare to see man-made objects as gorgeous as 3d renders. Your devotion to the beauty of precision has yielded a stunning result.

[@nogunnofear6703]

I hesitated to watch this and ended up subscribing. I find the whole concept absolutely fascinating. I have limited experience with the Lost wax casting process that I used to make some small jewelry. This is a fantastic level of expertise. Bravo great job

[@Zie_carpentry]

👍👍😊

[@allaboutperspective650]

Try casting in sand, when you can do that you can cast.

[@NateWoodbury]

This video reminds me of my friend, the Legend, Grant Thompson and the amazing videos he used to create on the Kong of Random. I miss that guy!

[@gsegallis]

Wow! A lot of time and amazing work went into that. I'm even more impressed that you have the tools and know-how to do that sort of fabrication.

[@tomkzinti2760]

That was refreshingly well put-together, man. Good job. The idea for zig-zag threading is simple and easily conferred, yet (I suspect) lies within a sphere of reality only rarely visited, much less brought to life before our very eyes. I appreciated the decently flat volume levels, your concise and smooth verbal narration with factual, well-worded content/descriptions/explanations and everything else as well!

[@xdHyperz]

Ayo this comment too formal lemme change the tone

[@tomkzinti2760]

@@xdHyperz Na - betta not sucka, my OP gots some likes naow, I ain't even frontin on that shiiz, fo real - obviously AF peeps like a nice worded comment that says it allllll so they don't hafsta, mirite?

[@tonygriffin8007]

@@tomkzinti2760 obv my dank memer

[@bruhmania7359]

You definitely think you’re way smarter than you actually are 💀

[@tomkzinti2760]

@@bruhmania7359 HEY! DO YOU EVEN LIFT, BRO?? fugeddaboudit ya jerky

[@btCharlie_]

I absolutely love how it turned out to demonstrate the rotational inertia!

[@Prophitman8]

I don't know how you don't have a million subs yet. great vid! I look forward to more

[@lelegoguemraoui772]

idk why these formidable channels which has really high quality content are not as the other viral channels

[@zacksrandomprojects9698]

We have versions of these at work. We call them 'Levelwinds' and they are about 3" in diameter and about 6' long. Mounted on a trailer that has a big rope reel on it for pulling in powerlines overhead. The 'nut' is actually a grooved roller that goes back and forth from one side to the other and back again insuring the rope gets evenly wound up on the rope reel. Also, it is razor sharp!

[@dieseldabz7104]

Ya I've seen bolts EXACTLY like this before as well in the military

[@bentnbroke]

This is absolutely crazy! From concept to actuality! Can't put into words how fantastic this whole process and how it came together! Bravo!

[@user-pm7hm2rw3w]

the version made on a lathe + manual milling machine) kzbin.info/www/bejne/pKXbpYxnm7ZrZtk

[@thefaultcode]

What a stunning project, this is really wonderful to see

[@mickeykyrle4240]

Thats absolutely fabulous. I'd like to get a few, especially for my disabled children they'd love this.

[@moladiver6817]

This is amazing. I'm actually trying to come up with some real world application other than a desk toy. Perhaps a really difficult angle in which a wrench wouldn't normally work but now it does because you can simply move it back and forth and still tighten the bolt. Or another idea. Around where the thread changes direction you could have 2 bolts next to each other. When you'd somehow be able to lock the bolts together and they are positioned on opposite threads it would be impossible to turn them.

[@waywardwizardmedia]

What you described is a ratchet. :)

[@Akoalawithshades]

@@waywardwizardmedia beat me to it

[@technaisci9489]

@@waywardwizardmedia the locking thing maybe good for axles and stuff uk like i designed a rover whose wheels kept coming off due to nuts rotating

[@thefastmeow]

@@technaisci9489 maybe try making the tightening direction of the nut opposite to the wheel rotation?

[@urugulu1656]

If you can remove the bolt head and make the bolt longer you could stick a (well lubed) bearing onto it and when then using a finer thread pitch that incrementally changes (this will be important) you can try and make this the clock source for a mechanical clock. you just need to get the weight of the nut(s) and the thread pitches right so that as the nut accellerates on its way down the thread will ensure that the bolt always rotates at the same speed. making it an accurate time source... getting those ratios right is an entirely different story...

[@Gravybagel]

I've never see that kind of detail coming from hobby casting, great process!

[@degacci]

I’m a 3D designer/engineer and a jeweler, so amazed by this video that I had to subscribe. Seriously! You’re brilliant!

[@xDMG15x]

This is interesting af. Nice touch that the nut orientation lines up with the bolt head at the top of the thread.

[@danieljimenez8371]

Watching this made me feel like I was watching “How it’s Made”again, 10/10 video unreal idea and execution

[@anuragmahajan5919]

That was amazing! The amount of detailing and cleaning, simply awesome!

[@vincentbiondo7019]

I'm going to be completely honest. This video was kinda amazing. Great production, excellent explanation, awesome process.... I'm not inclined in this capacity of making things in other words industrious. I'm going to try to fix my sliding closet door that fell off the frame, it's not much but I feel inspired!

[@danzielinski5036]

This isn't annoying at all. In fact, I see it as a great stress relief. and the MAZE bolt, I love physical games like this. Start your own game company. I wish I could.

[@fatbuttbassett4732]

THE ABSOLUTE BEST home casting results I've seen! Dang near perfect castings. Well done sir! You got a sub from me just for this video. Hopefully I'll like the rest of your videos as well!

[@jmchez]

Darn! You said everything that I came here to say.

[@freqyst]

+1

[@leaddrags]

Олег Певцов: Наконец-то достойный противник, наша битва будет легендарной!

[@user-dp3ye3mn8r]

Может быть, если когда нибудь Олег займётся литьём.

[@elimbekadambek8330]

@@user-dp3ye3mn8r 🤣🤣🤣👌👍

[@koni_nik0]

Чё?

[@aonlixplays1577]

Translate:Oleg Pevtsov: Finally, a worthy opponent, our battle will be legendary!

[@feerverk21]

🤣

[@The_Releveler]

'Overture filament' is by far my favorite filament

[@ethanproctor6695]

Wow. This guy really knows what he's doing.

[@Woozi185]

Imagine using a socket wrench, turning the wrench back and forth... and instead of waisting a turn in one direction, both left and right movements would work to drive the bolt. Bud you're a genius.

[@InfernosReaper]

Before you give the accolades, the real question are how easy would the bolts work their way out and how hard would it actually be to do the back and forth motion in a confined space?

[@l.h.9747]

@@InfernosReaper not only that but i doubt the nuts can withstand much considering that they dont have much left from the threads

[@TheKayliedGamerChannel-YouTube]

@@InfernosReaper only works with that slim nut also...

[@TheKayliedGamerChannel-YouTube]

@@l.h.9747 Exactly, it's a gimmicky bolt, the nuts probably have a single thread. Fine as a curio 👍

[@78tag]

I'm not trying to be an antagonist but this is the type of idea that we peons that who have to construct the world, that engineers come up with, that doesn't work in the real world. You can build anything with a pencil - the trick is to make it happen.

[@JayMaverick]

Amazing how well the 3d printing resolution is preserved in the casted metal.

[@Zie_carpentry]

😊😊😊

[@valdius85]

I 3D printed and poured melted metal into the mold I've done in my backyard... Impressive. Very impressive :)

[@levantarpesas9972]

Dude this thing worked so much better than I thought it would’ve!

[@thomas1055213]

Such a cool demonstration of how 3D printers can be used for more than just printing plastics. This is also such a cool concept

[@CarlNeal]

This is INSANELY cool to watch. You are clearly very knowledgeable about the materials and tools used in this process. Thanks for sharing!

[@DanielFrost79]

Google is his friend. 😇

[@realracer0353]

Thanks for including temperatures in degrees Celsius too!

[@adsta5]

Super talented designer and engineer. So often people are only one but to do both and have it work so beautifully is really impressive

[@alexeylarin7330]

When u opened the kiln at 3:17 those incandescent lines look like LED's😂😂😂

[@axiom1650]

That's the best lost PLA castings I've ever seen

[@Cabe71]

this makes me want to build and buy all the stuff I need to make my own polished metal version lol absolutely beautiful work

[@Jimjolnir]

I want one! That was so satisfying, the movement and the sound.

[@sebneeds]

Thank you KZbin recommendations for this gem! Watching those bolts slide down the perfectly-executed bolt is sheer satisfaction. Bravo!

[@herrfriesel2629]

this video has the HOW ITS MADE vibes and i love it

[@Taime88]

These are definitely more useful then desk toys. With power going into them, you can use the copper in it as a way to conserve electrons from the power source. Normally when using a powered device excess energy escapes. Using something like this you can grab excess energy and funnel it back into the base of the battery device. It's a great energy efficiency concept.

[@JJ-vq1xo]

I absolutely love how he made extra measure and even used exact science to minimize damaging the air. Super cool and +5000 social credit

[@sarhalianvlog9261]

hs:kzbin.info/www/bejne/gYu8goeParGNgJKi

[@tuyentuenguyen9909]

This bolt has not been applied specifically at the moment, but I have a feeling it can be applied in some technical applications. You have a great idea and the skill to get it done is also great..

[@123shansun]

You know heavy machinery which drill into the earth, sometimes do that motion (spin back and forth) to remove excess wet rock and sand from the giant drills by inertia, maybe they could use such a mechanism

[@kalfaxplays7899]

@@123shansun nah.

[@LuisCasstle]

I highly doubt it's the first time anyone thought of doing that. It's not a thing because it's not practical.

[@kalfaxplays7899]

@@LuisCasstle true

[@Keys879]

@@LuisCasstle it's just not practical for any use we have... currently! The future holds many secrets waiting to be discovered.

[@thlee3]

ive never seen that liquid ceramic casting stuff. amazing.

[@beresheetbarah8946]

I would love to see your creations sold in stores! I have ADHD and this would be a great fidget toy. Amazing videos!

[@Yamahog]

Well done, Sir. It explains some of the mediary steps of the process of 3D printing to final product that often goes unexplained when concept goes to production. Thanks Stay Safe

[@cscottshoe]

Loved watching the process! The detail was way beyond what I expected. Thanks for the video

[@Poppa_Badger]

I used to be a tin knocker and also worked on a 12 ton hammer at a drop forge, so I understand the properties of metal. I have to say that I really enjoyed your video!👍🙂🙏🙏🙏Teaching our young important things that could be useful in the future.👊👊👊

[@thillaiambalam5661]

Wow,excellent job there. Never knew that bolt with opposite threads can be done. 👍👏

[@Luffydkenshin]

I’d love this as a desk toy, or a smaller one within my budget, lol. Too cool!

[@kennys.not_dead]

I thought this is absolutely amazingly creative. My goodness man, I am amazed at how this turned out.

[@sherlockholmes1505]

i like the elution it makes when you spin it!

[@yhuang9]

never thought about bolt threads can be designed like this way. I don't know what it could be used for, but it is a very interesting thing to know. thank you

[@andrewshepherd1537]

Gives a whole new meaning to cross threading lol. Great work man, I'd love to try this one day when I get the time

[@Paulrm68]

There is no doubt Your a clever bars.... Seriously respect and a shout out from the Uk 🇬🇧 It is really satisfifing to watch 🇬🇧😉😉😉😉

[@shimomiaizo]

is it just me or are these videos weirdly soothing...

[@X-JAKA7]

The sounds of the object, and the object in general will be my call sign to call my future family that dinner is ready.

[@joshredding9588]

Man, you have the most proven casting process I've ever seen! Beautiful work dude!

[@leesuschrist]

I always wondered how the investment casting process would work with the use of PLA. The quality you got here is truly amazing to me.

[@greggv8]

It also works with sand casting by printing the PLA cores with 1 layer thick walls and minimal infill. The molten metal burns the PLA out. Works like lost foam casting. Getting the sand packed firmly around the plastic core is very important.

[@bo_unerro]

When you flip the bolt with all the nuts at one end, it also kind of demonstrates how multiple sine waves can interfere to create complex patters

[@silkroad1201]

Imagine the people who used to make intricate objects without all of today's fancy technology like 3D printers. Now that was skill