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Catapult Inspired By Leonardo da Vinci

by Ollie9T7 Feb 18, 2019
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Trebuchets are the superior siege weapon

So I’ve been told...

Is it possible to get this as one merged .STL file where i only have to add the rubber bands? With our 3D Printers we can print this in one part without any supports.

I’d say no, the print orientation wouldn’t give much in the way of strength and there would be no way to print it without supports.

We don´t care about the orientation. We print with laser sinter Systems and we use p-powder. So the part is always supported by the not melted powder. It´s just difficult for me to merge all the single parts together to one part without having them as SW part.

Forgive me, i dont know much about any other forms of 3d printing other than FDM. How would anything rotate if it is all printed in place? the spring has to have a certain amount of flex in it to work thats all i was thinking about.

If you need rotating parts you have to put the shafts in the middle of the holes where they go through. They need around 0.3mm of distance between shaft and wall so they will rotate after printing. If you want to know more about our printers or technology just search for "EOS lasersinter" in YouTube ;)

Question regarding the hardware. I am trying to find the M4x25mm screws and M6, but it seems I can only find M4x20 and some various M6 in these kits on amazon...otherwise, I need to buy a single pack of the proper screws but for $8 each, which is way too much for me to put into this awesome project. Where did you get your screws and nuts?

You can use any length screw you wish providing they’re shorter than what my list says.. I only specified these sizes so the thread on the bolt has enough room to cut a decent thread into the plastic as you screw it in. You should use as close to the stated sizes as possible but 5mm or so less length should still work. The threaded rod must be the stated length though. Thanks for the comment and kind words! :)

Thanks! One last question. You state 5mm or less length should work, what about a m6x30mm vice the m6x40mm? I can find a kit with everything except that, only the 30mm. Is that too short? Which one is for the m6x40mm anyways? I watched the video for assembly but it doesn't quite show me which ones to use where.

M6x30mm should work, the holes in the base max out at 30mm so you may have to use a washer on each screw, but it may also work, you'll have to try it. You could always design a small washer to fit on the outside of the frame and print it as a spacer.

Started printing the other remix of this, but decided to stop and print yours since it is the original and looks like you are keeping up with updates to make this even better. Thank you!

Thank you! I appreciate this. Looking to post another update soon...

Thanks for sharing, this looks very well designed.

Thank you friend :)

Really cool thing to build, Im going to print the new version of the falcrum tomorrow :D

Looks great, glad you like it!

So i'm about half way through printing and picked up all the hardware from the store today. Wondering if you could clarifying something for me- I bout a 100mm M6 rod, but i'm now printing the front and back frame, and seeing they are 99mm long. So won't i need a longer M6 rod? Any tips would be appreciated!

Hi, thanks for your comment! The M6 rod doesn’t go all the way through the fulcrum. It goes in roughly half way and has to stick out from the a frame so you can mount the ratchet gear on it. You have to ensure that the rod screws into the fulcrum and cuts a thread into the plastic. Then attach a nut on the end face of the fulcrum to secure the rod to the fulcrum (so the two pieces act as one) this ensures the ratchet works properly. I may create some drawings at the weekend to alleviate any confusion. 100mm Long is plenty long enough for what you will need. I hope this helps!

This makes a lot of sense now. Thank you for clarifying!

No problem :)

Would look great if printed in a few different colors! Maybe using wood-infused filament for the stand and arm, and stick with grey/silver for the gears/wheels, ammo cup, etc. I may try this...

Someone has actually made one that looks like you are describing, have a look in the “makes” section. Thanks for the comment!

What's the best orientation to print the fulcrum?

Vertical with the circle at the bottom

Brilliant! great to see people enjoying it! Thanks for making it!

You nailed it ! Did you make some showcase video ?

video would be cool though. not necessarily for the assembly but to see how well it works and how far you can catapult stuff... :)

Nope, the assembly is pretty straight forward and finding out how it works is all part of the fun! Thanks for the comment

AWESOME !!!! Thanks for Sharing

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