Mag Fed Mini Rubber Band Gun

***OUTDATED VERSION***

Find the new model here:

I have spent a few years iterating this project. Finally it is fairly simple and reliable. This rubber band gun shoots bands from a MAGAZINE. It uses small “rainbow loom” bands, which allows the design to be compact. Unlike other repeaters or gatling guns, this mag fed gun stores its ammo unstretched. This allows multiple mags to be loaded for long periods of time without the worry of bands breaking due to fatiguing rubber. While other designs change trigger pull weight or cocking force with each shot, this one stretches just one band at a time giving a consistent racking experience. There is a hollow grip for convenient band storage and an access port in the slide for monitoring, and clearing jams. Full demo and assembly video:

There is also an instructional PDF in the files page containing slicing and post processing recommendations.

Skill level:

Intermediate. This project requires intermediate knowledge of your slicer, E.g. support blocking and seam placement. Cleanup and assembly is straightforward but might take some fine tuning.

Tools: 

XActo and/or utility knife

Sandpaper and/or file

Pliers or flush cutters for support removal

Screwdrivers and or Allen keys for hardware

Materials:

PLA or other stiff filament

Two M3 x 20mm machine screw

One M3 x 14mm machine screw

Two pen springs, just under 5mm OD.

Two 5x5x2.5mm Magnets

60mm of 1.75mm Filament for sliding pins

Super Glue

15mm wide or narrower thin double sided tape(or just glue)

Rubber Bands!

Dimensions:

Gun. 180mm x 124mm x 32mm. Mag.122mm x 35mm x 7mm.

P.S. I have no idea if the picatinny rail is functional. It it based on dimensions from online and I have never tried it. Please tell me if it works!