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by MlePh Apr 10, 2017
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I am looking for something to help in figuring out the line and pouch. The pictures do not show it well. How long should the string be? How big/shape should the pouch be?

i have added a pdf with the dimensions of the line and pouch i made. And i also added some pictures.

Just so everyone knows: I printed at 99%, top screws I used M3 x 20 for the six that hold the pivot point for the throwing arm. For the screws for the springs I used four M3 x 5 PPMS screws. For the push lever to release the trebuchet I used two M3 x 25mm screws.

Can anyone tell me what they used on the bottom? I don't want the trebuchet to be sitting on screws, and I see the holes are countersunk, but I am not sure which screw will go in and lay flush...

By the way, got all my screws from trimcraftaviationrc.com, seems to be cheaper than local department stores if you order in bulk.

Just finished printing!! Very excited to try it out.

How does the string attach? I couldn't see a clearly in the pictures and videos.

Thanks for sharing!

Printing this now. All parts scaled to 0,95. How is the pouch attached?

UPDATE: It's coming together nicely. Needed to sand down the puzzle parts to make them fit. Also, I am filling the counterweight as it's printing. See image. Little tricky but doable. Just using old bits and bolts.

All in all, so far a nice design. Will update again when all is done.

Final update: It's done. Posted in the make section. It works like a charm! Needed a little sanding to make everything fit.

How did you route the string?

Can you provide the CAD files you used during the design?

This is very cool, printing it now in PETG. Do you have any instructions on how to install the strings and the pouch? It looks like you have some rings on the free end of the string but it is hard to make out exactly how you did this.
Thanks for sharing, will be great to play with this and attack sand castles with my kids.

One sugesstion: maybe you can add a Version for cylindric screws
One question: what is/should the exact dimension of the springs be?

why not using normal screws?

The springs i used are 5.4 mm in diameter and have around 20 mm distance between the center rings.

How should i orientate the big "Seitenteil". I have enough Space.
I'd print it like it would be mounted, so on the smaller triangle.

I printed the seitenteil standing up, in fact two just like it is assembled at the same time on a 11.8 inch printer. Worked great

If you have the space in z direction i think it should work too if you print it upright. But maybe you should add support for the details in where the bottom parts fit together. Otherwise the holes for the screws might not come out right.

I printed them like they are aligned in the stl.

Beautiful trebuchet design!

Beautiful benchy design! ;)

Thank you, Philipp! :)

Would mind posting your YT Video here also?

How far can it launch a projectile?

Depends on the counterweight, weight of the projectile, length of the line,...

i get around 15 meters