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The 31K Hardware Kit is a parts bundle for building a 3D-printed 31K foam-dart blaster or one of its many variants. It covers the C, M and L hardware sets, which share parts across dozens of designs, from the Halo blaster to the Robocop Auto 9 and the Sound Voltex controller. The kit includes two drum springs for magazines of any size. It suits hobbyists who already own a 3D printer and want one hardware pack that spans several builds. Compared with buying parts piecemeal, it saves sourcing work, but it is not a finished blaster and needs printed parts plus bearings for most variants.
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Lowest price we've seen: $47.99 on Nov 12 at West3D Printing. Tracked across 1 store since Nov 12.
This hardware kit includes the parts needed to 3D print your own 31K or a 31K variant. It comes with an assembled plunger and TPU shock absorber, plus a sear. It also includes 2 drum springs, enough for 2 magazines of whatever size you like.
The rest of the pistol is printed separately. Print the working parts at 100% infill in a tough PLA+ such as CC3D, eSun, Sunlu, or similar. The muzzle and turnaround can be printed at 50% infill.
Each version also works with other builds, and each build calls for a set number of bearings. A 9-bearing bcar is suggested for the L version and at least 6 bearings for the M version. The C version should work without a bcar but will benefit from one.