One-Piece Rubber Band Gun

by thoromyr, published

One-Piece Rubber Band Gun by thoromyr Oct 3, 2014
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This rubber band gun has the frame as a single piece and can load multiple shots. The "sight" is separate so it can be printed in a different color -- when I do it again the sight will be in glow in the dark.
This is based on the "Rubber band gun simi[sic] auto" with changes as follows:

  • frame joined as single piece
  • pin/dowel tapered to ease insertion
  • front sight separate piece
  • trigger guard expanded to accomodate trigger
  • grip is taller


Printed all parts at 0.3mm layer height for speed. Although it is designed to grip, the sight/frame snap in works better with layer texturing anyway. The pins also gain a friction benefit. The other parts are unaffected so there is no real reason to print at high resolution.

Mostly printed with 2 shells and 10% fill, though I think I increased that to 3 shells and 15% fill on the front sight.

Assembly is pretty straightforward: the trigger and sear can only be fitted to the block and pinned in a single way. I then put the wheel in and pin it. The sight is just pressed down into the gun frame. No glue needed though it could be used on the pins and the sight.

If my revised pin is too loose then use the one from the original, but I found the results on my replicator 2 to be too tight to work.

Given the particulars of this design, I could only get four bands loaded. If it doesn't fire on the first trigger pull, pull again and it will.

If you have problems with the action being too stiff you can print the Mk3 pin and use it instead. It has been modeled for a slightly looser fit in the middle to reduce binding.

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Make sure that you print this in BRIGHT COLORS....so no one mistakes it for a real gun.

Can't seem to get the orientation of the sear right. I almost want to say something is too short. Even if I get the pieces to hook up, I'm imagining the sear pulling the trigger down and pushing it all the way forward inside the trigger guard.

Very confused, terrible directions. There should be a video for assembly.

yes exactly this model is so complicated

It took like 8 hours to print, and then it doesn't even work. There is so much friction in the parts that I have to force it, also the rubber bands just pop off, they fall off by the time the wheel is in the fire position

Really like it. Maybe you should make it a bit more "Glocky?" shorter, thicker, slightly more detail?

I printed this thing and I tried a couple different rubber bands, when you put more than 2-3 bands on the gun the bands get stuck in the mechanism and then it doesn't advance, with 2 or 3 bands its pretty reliable this seems to be a common problem with other designs on here as well. This design is the best looking I was able to print it on a Flashforge dreamer across corners. The mechanism design could use some improvement ..

does it need supports

Does anyone have any pictures on how to put it together? I'm confused.

when putting it all together it wont work. The trigger doesn't return

There's no spring in the mechanism to make it return. The tension to do that is provided by the rubber bands. Load several and it will advance for each shot. Until the last, because at that point there is no tension.

it looks awesome but it dosen't fit in the lulzbot mini :(

FYI The pins are missing in the fixed version.


Ineed to print only gun_print_fixed2.stl part? or all part that the page show?

i want to print it with M3D and i scale the part.
so i need to know if i need to scale all the part.


its been a while since I've looked at this, but the gun_print_fixed2.stl should have all parts so printing that at whatever scale should work.

Thanks!! Any image how to Connect all parts?

I try to Figure out by myself, thank you very much :)

I am confused on the direction of the sear. Also is the lock needed for it to work - or is that just a safety feature?

Mechanically, to work it needs all of the parts (though of course you might substitute for the pins). I don't have pieces in front of me, but some part flipping should quickly make clear how it needs to go together.

most repraps have a build surface of 200*200mm. its too big. or atleast it must be cut.

Try printing it on an angle.

...and for printers that it is not to big, this works just fine. But, seriously, this is a remix of one that is cut. Use that one.

It looks like thingiverse isn't showing it as a remix for whatever reason, but I give the name of the original in the "Thing Info"

Question what is the elastic size number recommended?

Hi, just wondering how long this takes to print? Thank you.

That depends on the settings and your printer. I don't remember just how long it took on my replicator 2, but the frame is what takes the time. It is only a ball park, but Makerware estimates about four hours at 0.3mm layer height (2 shells, 10% fill).