My 3D print files, including full 3mf pre-slice, can be found here- https://www.rapid-forge.com/product-page/uv-tracer-unit-printed-parts
 
An open-source, 3D-printed muzzle tracer. It flashes a UV ring the instant a BB passes, charging the phosphor so the round glows downrange. Add some WS2812B LEDs and flash whatever colors and patterns you want: use them to show your remaining ammo, visualize your rate of fire, or simply flash your opponents. Throw on a 128x32 OLED screen and precisely monitor your ammo capacity. It's all controlled from your phone over the unit's own Wi-Fi, with no app to install. Full control at your fingertips.
 
Building this requires a moderate amount of knowledge on wiring modules, arduino firmware flashing, and some decent soldering skills! It is not a project you want to rush, it can take up to 3 hours to solder all 20-30 joints. 
 
You are allowed to do with this free code as you please- make some crazy build with this system integrated! 3D Design and print your own housings using the same electronics! Please credit Rapid-Forge.com in your custom designs, so others know where to get the build files. 
 
Copyright © 2026 Kirk / Rapid Forge
Licensed under the MIT License.