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12 Shot Rubber Band Gun

by Isaac_e93, published

12 Shot Rubber Band Gun by Isaac_e93 May 4, 2017
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Fusion 360


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49449Views 10487Downloads Found in Toys & Games


This is My 12 shot, semi automatic rubber band gun.

I've designed this to be super easy to print, easy to put together and a fun and functional outcome!

The Cog will hold 12 rubber bands, firing 1 at a time (with the single shot trigger) and all off them at once with the auto trigger.

The spring used to rebound the trigger is the spring out of a common click pen, so easily obtainable!

The bolts are M3 x 25mm with nuts.

I hope you enjoy my toy, and feel free to remix it and join in the fun!

full_gun.stl is a combined version for 3d viewing

Print Settings


Tevo Black Widow










Mechanical components are best printed with 100% infill, whereas the gun frame itself is fine with 20 - 30%

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I don't get it.

The 2 shafts are fitting in the gun case but are too thick to fit in the cog and the trigger.

do i have to drill the cog and the trigger with bigger holes?

Hey mate,

You can drill out the shaft to fit the cog and trigger for better fitment, and is recommended that you have a tight fit (or glue) the cog to its shaft and the trigger to its shaft so that the solid bodies rotate on the gun frame.

Isaac, this is a great design. Printed wonderfully, the kids love it. Thank you for sharing your work!

Thanks mate! I'm glad that you guys love it! :)

Could you tell me what pen you used? All my "Common" pens are too big.

I can't recommend a brand of pen but a general click out and click in pen's spring should do the trick. :)

I've successfully printed all details. But trigger guard doesn't look good (plz see attached). Did I miss something?

did you try printing with supports? it may help the stringing issue, otherwise I could only put this issue down to printer settings / incorrect g code conversion.

yep, actually this is my second print and i've never heard about support. now i know :) thank you for the tip and great model.
maybe you can add a note in summary about support, i'm not the first person who makes this fail.

Thanks mate, I certainly will! glad I could help.

Woohoo! I'm no. 2,000 to collect!
Thanks for the share Isaac_e93, congrats!

Thank You very much! I hope you enjoy the printed product!

I had to scale x and y up to 110% to get the mentioned m3 bolt and nut size. Printed on a cr-10.

Im glad it worked for you after sorting out the small issues :)

Is that a bag of chocolate coins in the background of the first picture?

Nice design. I had to reduce it to 95% to fit my bed and then drill the screw holes a bit and heat the nuts to sink them in, but it mostly worked. The only issue I have is I can't load more than 6 shots with the single shot trigger. Don't know if it's the design or my resize that is causing the problem.

what is it doing when you try to add more rubber bands? are they slipping off or are the gears not responding properly?

The gear won't turn to allow more to be loaded. I'm going to try filing the trigger a bit when I get the chance and see if that helps.

are the rubber bands really tight? Im not too sure whats causing that, file the components down to make everything rotate around each other easily and it might help :)

i had to scale the trigger down to 99% to get a proper 1 shot trigger overall its a proper toy

Can this be printed at say 75% scale? the body is too large to fit on my print bed.

You need to slice whatever won't fit. I had to slice each frame section into thirds to get it to fit because my printer has low quality far up, but slice it in half and you should be fine.

i havnt tested scaling with it yet, but i dont see why not. :)

If printed in ABS the Cog and the single shot trigger should be printed in about 102% otherwise it doesn't stop after one shot

I printed in PLA and found I also had to scale the trigger up by 102% in order to get single shot, at 100% it would single shot one or 2 then auto the rest all in one trigger pull. There was no need to scale the cog, just the trigger.

Is the trigger and cog supposed to be tightly fit on the shafts (and the shafts rotate in the body), or the other way around?

I haven't fully assembled the gun yet, but the single shot trigger doesn't seem to interact correctly with the cog, the cog can't rotate past the inhibitor (no idea if that's the right word) pin on the trigger when the trigger is not depressed, so the cog basically can't rotate at all. I imagine I must be doing something wrong.

yes the trigger is supposed to be tightly fit or glued onto the shaft, and the shaft rotate on the body.

its a close fit to get the cog rotating properly, try file down the inhibitor until the cog can just rotate past it when the trigger is not pressed.