Catapult (3D Printed) with Leaf Springs

[@error.418]

Simple other stuff to consider: adding staking holes to the base so you can use tent stakes to hold the base to the ground to prevent loss of energy to moving the machine instead of the projectile. try wheels on the base instead, as for trebuchets we've shown that this allows for a longer throw, but this may not hold true for a catapult, and would be an experiment.

[@PortalFPV]

This is seriously the coolest thing I've ever printed! Now I need to print enough for a fun siege

[@Sander-Brilman]

This is awesome, thank you for not only making this model but also making a high quality video explaining how it works and how to assemble it

[@totallyrealname8849]

You’re the best dude, only a genius could make something like this

[@jollyroger724]

amazing work! printed this off while at work and came back to assemble it. Finished in 30 mins.

[@hbw8756]

This is seriously the coolest thing l've ever printed!！

[@Legal_Addiction]

Printed great on my 2 modded Klipper Creality printers. Great design!

[@pppdronefootage]

Very nice one, i assembled it in less than 8 minutes and is so fun to play with it, many thanks

[@Aaaaaaaaaaaaaaaaaaaaaaaaag]

OMG i found one of your amazing videos in time to comment! i just want to say that i love your videos and enjoy printing your models. you 6 shot disc shooter is amazing and very fun. i honestly don't know how you do it. lots of love 😊😊💕💕🥰🥰

[@afarmer4]

Great design. Printed at 125% and wow does it have some power for just a toy

[@justintime5021]

This was so cool. I actually printed 3 of them. One at 100% one at 50% and one at 190% which is the biggest my k1c can handle. All three work incredibly well. I printed it all in pla except for the springs. 25% infil on everything except for the arm which i printed with 50%. For the leaf springs and stop i printed them in petg with no infil but like 20 wall loops (enough so they were solid wall)

[@ItsMado]

will definitely print

[@shadowmint98]

This design was awesome! I can’t wait to see more!

[@andrewstockton1137]

This is awesome! Thanks for the great design and instruction.

[@Winter_mendor]

Very cool!

[@mobjois]

Brilliant work. Beautiful design.

[@BamBamDesign]

Again and again and again...very nice model Uhle😉

[@shmebuloc]

i love your videos so much, you put effort into it, it shows. you are an absolute professional human, i love it!

[@tambunico4282]

happy you are back! was waiting for your next video :D

[@Ghostdawg420420]

This is def in my top 3 coolest functional prints of all time. My son and I love it and I cannot wait to try to print the 210%. I wish i had the talent to design stuff like this, i just know how to print it!

[@Ghostdawg420420]

​ @uhltimate When i scaled the catapult up to 210% i notice things are loose vs snap together tight. Did I have to do something other than just adjust the scale of each piece to 210%?

[@ChristopherKlepel]

Brilliant love The design. Nice work

[@GlassicGamer]

Fantastic design! I made one in PETG for flexibility.

[@benon3d]

i'm def printing this overnight

[@rpmmaster8661]

AMAZZING DESIGHN!!!!!!!!

[@wekker090]

works great, Now I can play with 155 in the field and a 200% version of this catapult in the office 🙂

[@FlawedbyDesign777]

The auxetically bistable catapult

[@Pedozzi]

You are a genius

[@athenovae]

Bro created a compound bow 😂 then Dry fires it for education and tests at an archery range. Hahaha

[@artemgoncharenko646]

This is amazing architecture! And beautiful explanation. You are reallly cool! Thank you!

[@SafetyHammer.]

Made it, needed to reduce the width of Stopper by 0.5mm in my Qidi Q1 pro. Great Model.

[@Karpfenolli]

Great model, but unfortunately the STL doesn't fit on the print bed of a Prusa MK3 / MK4. Wouldn't it be possible to upload the parts as individual files? That way you could print them more beautifully in individual colors. Thank you

[@uhltimate]

Done!

[@Ghostdawg420420]

​@@uhltimate When i scaled the catapult up to 210% i notice things are loose vs snap together tight. Did I have to do something other than just adjust the scale of each piece to 210%?

[@justintime5021]

​@@Ghostdawg420420 I scaled mine up to 190 (that's the biggest my k1c can print. The pins attaching the arms to the throwing arm are captured. So there was no issue there. The ones holding the arms to the springs however were too loose. I simply super glued the pins into the arms.

[@srowe829]

Just printed and it is amazing. Thank you so much. Now to make it bigger lol

[@Alliedturtle11]

Nice

[@Induku]

this is really awesome

[@Kart0nas]

lovely!

[@mikeytom2991]

Printed it in my P1S. Man this thing is serious! I am making my second now to vs my daughter in cup challenge. Some recommendations. Holes or something to place in ground maybe streak holds or something we can print and attach. Also the video was amazing great detail love it. The assembly was a little fast and when you move your hand in front of the model I cannot see it. Besides that I just got this printer 3 days ago and it's wild I can print amazing things like this!! Thank YOU!

[@WolvyFer]

amazing

[@jonasv328]

Very good design, very good video!

[@FlameGuy23]

im abt to print it!, honestly It is a very cool model. keep going btw

[@PapaRusty]

This is an absolutely awesome catapult. And it has alot of power for such a small device. Significant improvement over the rubber band powered ones we've all played with in the past. Could those leave springs be utilized in a crossbow or ballista style weapon as well?

[@ryanfahey640]

First off, this is an amazing design, an engineering feat. And thank you so much for providing it free to everyone. I was unsure about how to print the springs, so I did concentric with 30% infill, so it resembled a leaf spring on the inside. I don't see it mentioned, but from the short printing video it looks like you made them completely solid from PLA? I thought they would break like that. Thinking about also trying TPU. Looking to maximize the energy of the springs for further throws!

[@DIYtechie]

Brilliant!

[@JustOnlyOnePiece]

marvelous video subscribed

[@mihaelpetric6571]

nice video

[@elijahandrew3314]

I love this design! Could we see leaf spring vs spiral spring vs other spring?

[@cyanophage4351]

So tempted to make this! This looks great! By the way it is "Five point three seven joules", not "Five point thirty seven joules".

[@iamhuman1]

That 210% is fucking scary man when I test fired it it broke the brackets holding it together for anyone reading it increase the infill % on the middle bracket

[@BelviGER]

I just built a 300% one A bit scared of tensioning it

[@TomWilkinsonEsq]

I'm currently almost finished a 275% scale print of your catapult in CF PETG and TPU. I let you know if my catapultmaxxing works out. 😁

[@Jackpowderkeg]

my 210 keeps busting did it in petg the main catapult breaks as it hits the stop with so much force when fired. try 100% infill next

[@TomWilkinsonEsq]

@Jackpowderkeg I actually printed the stopper in TPU so it kinda cushions the impact. The 275% works pretty good, although I'm considering printing the leaf springs in nylon to see if I can get better performance.

[@maks_not_max]

Hi, you make great designs, thank you so much! Could you tell me if you have thought of adding some “hooks” to this design to bury them in the ground to fix the catapult when using it outdoors? So far I've only launched it at home with a fairly soft ball, but if you don't hold the catapult with your hands, it will 100% shift or even flip over during the launch.

[@anancapcat4221]

One very important thing is to remember to have the arms in the back pointing upwards and the arms in the front point downwards before you assemble them onto the base frame. Otherwise they're be in the wrong position and you won't be able to rotate them in the correction position since the frame will be in the way. Also remember to have the joints facing in the upper left hand corner to the lower right hand corner otherwise the thing won't fling correctly. It's a bit hard to describe but that's what I've got for now.

[@PvZTutorial364]

You should build more gravitrax parts

[@heavenisalie]

it would be nice to list the actual settings for those that don't use bambu studio. cool design otherwise

[@hanswurstusbrachialus5213]

You just assume anybody uses a noob bambu printer :D. But nice project. I like it very much.

[@maxwell_edison]

Would the distance the Catapults fire be farther if you anchor them down? Seems they bounce themselves back a lot, which surely is wasted force Also did the 2x scale one work well at that scale? I'd love to keep going larger if possible

[@uhltimate]

Yes, if the catapult is lifting off before the rock has lost contact, that’s wasted energy. It’s not much, but if you hold it to the ground, it performs better. You don’t have to scale the model up; it was just a test because if I upload this model, someone is bound to do it, so I wanted to be the first.

[@ghabhuzomeuh6964]

Re-creating Da Vinci Catapult!

[@bruceleedleleedleleedlelee1127]

I feel like this can be turned into a hardwareless nerfgun

[@Roobotics]

For your distance x mass and joule calculations between the two size, I feel like the disparity in results between the two designs feels too high? It's obviously 'true' for those two projectiles, but what is the infill of the launched balls? Wind resistance might be dropping the numbers fairly drastically for the smaller one due to it's weight vs surface area, just a thought but not certain! It very well could be the larger one is just that much better, but what about if the larger one was launching the smaller ball, or the smaller one (attempted) to launch the bigger one, etc etc. Maybe this gets into the weeds of optimized weighted-shot to extract optimum kinetic joule output. Sort of like impedance matching.

[@uhltimate]

You might be right that the energy difference between the catapults is too high because the environmental conditions impact the scaling differently. It probably would have been better if I had simply measured the stored energy of the leaf springs for comparison.

[@tripleeight7598]

I have a problem. In my case 4 lower springs breaks or have ti much power :/ grown man must use both hands to push it back and in 3rd time it brokes

[@edwardzykan2506]

Me to. It works with 1 spring but all 4 are impossible to pull back and it breaks a spring.

[@tripleeight7598]

​@@edwardzykan2506Musisz dac 6 warstw krawedziowych i 10 % wypelnienia

[@taavikoppel1769]

Please also do a trebuchet.

[@_numanair_]

Nice looking model! If the arm had more thickness or a rib to make it stiffer would it help transfer more energy?

[@uhltimate]

Yes, the throwing arm should be light and stiff. Ribs would definitely be better here, but this model was designed for a card model contest, so that’s why it looks the way it does. However, it still works quite well.

[@JD_Shop]

Hey if you could can you tell me how much filament the 210% catapult was

[@ItsMado]

Can you upload the important print settings on thingiverse? I am trying to print but my current settings are too weak

[@NoamTurkel]

I use prusa slicer how to change my settings so that the pla is strong enough (Dunno you mean infill and increase the perimeters?)

[@vika-izhevika]

What is the weight of filament used for the catapults?

[@uhltimate]

It's orginal Bambu Lab PLA with 6 wall loops.

[@Flaakk]

My printer has a large printing bed, 500mmx500mm. What considerations should be taken when further doubling the scale of your shared design?

[@uhltimate]

Hi, I would stick to the original size. This model is fun for shooting treats for cats and dogs, which is kind of a funny thing to do. I also think the smaller catapult works better in proportion.

[@Flaakk]

@@uhltimate Totally. I get that you don't want to be responsible for someone losing an eye because they thought "bigger is better".

[@shmebuloc]

do you read comments?

[@uhltimate]

I do :) ... all the wonderful comments on my designs and on my videos are greatly appreciated!

[@anancapcat4221]

4:25

[@Eduardo_Ventura]

Was quite a waste of material. Broke on the first try.