My stepson wants to go Halloweening as a Diablo 3 demon hunter, a character that welds 2 hand crossbows.

I'm a designer new to 3D printing and Autodesk Fusion 360, with a lovely revolution infinity 3d fdm printer.

A match made in heaven...??

So in the video the red one was version 1, the whitish ones are version 2, and the black ones (not assembled) are version 3. I might do one more version as the holes I put in the handles are not printing great for me (mostly because I'm too cheap to spend plastic on supports unless I have too).

Doesn't Matter

Yes

2 micron

30%

I used colorfab traffic red and that worked fine on version 1, but I switched to what I thought would be stiffer, taulman palladium for the second one, which gave a stiffer bow (more powwarr). On the bow it's important to have a thick wall, mine was set at 1.6mm, so the bow ends up almost solid, but with a few voids that help it be springy. I printed at 215 deg. The big problem I had was that the thick walls caused some weirdness in the handles. The bow needs supports when printing, and on the stock/handle it probably should as well, though I didn't use them.

I used crazy glue to glue on the string holding post. Seems to have worked good. If you use it a lot a bit of crazy glue might be a good idea on the spot where the string gets pushed over the post. I used a decking screw to hold on the bow, but a Pan head would look nicer. I reamed out the hole a bit with a 1/8 drill bit.

Best solution for loading is adding a pull string, behind the marshmallow bucket with nice long tails. You grab the tails, and pull back, which pulls the bowstring away from the bottom of the marshmallow bucket. That is what you hook over the little nipple thing that you glue on at the back of the trigger. When you pull on the trigger it pushes up on the bucket, slipping the string off the nipple. Simple and easy to print. 1 screw, 1 dab of crazy glue and a way you go!

I'm learning Fusion 360 and have a new Revolution 3D Infinity printer and was looking for something new to work on. My stepson has introduced me to Diablo III and his favourite character is a Demon hunter who dual wields hand crossbows. He wants to go as a Demon Hunter, so I thought it over and agreed that I would try to make the crossbows. I wasn't sure that PLA, the corn based plastic I use would be stiff enough to make a bow. Wow, was I wrong! Great little unit. Shoots mini marshmallows with a nice flat trajectory for about 15-20ft. Hard enough to hurt an eye probably. Lots of fun!