The Audacity aka The Brick Wall, Brushless Nerf Blaster

Features

• Fully custom firmware (found here)
• Closed-loop flywheel control via Bi-directional Dshot 600 (both PID on RPM and naive throttle control available)
• 3S and 4S battery compatibility.
• Adjustable FPS. At 100% throttle it gets around 185 FPS on 3S and 210 FPS on 4S with 2450KV FLASH HOBBY Arthur motors.
• Configurable select fire modes (currently semi, binary, burst, and full)
• Idle-rev mode
• A display screen and rotary encoder for adjusting settings
• Optional rev trigger with multiple different modes (toggle idle, hold for idle, hold for rev)
• 7mm crush hycon flywheels (Spirit-at-home)
• Optional closed-loop solenoid control
• Optional custom PCB, powered by an RP2040-Zero (files found here)
• Designed around a 4-in-1 AM32 ESC but should theoretically work with any ESC that supports Bidirectional Dshot 600

Printing Instructions

• STLs are preoriented for printing
• Flywheel cage should be as solid as you can print it and should be printed out of a heat tolerant material, at least PETG
• Flywheels were printed out of ABS with 4 walls, 4 top layers, 5 bottom layers, 25% honeycomb infill, random seam, 0.1mm layer height
• Autogenerated tree supports should be sufficient
• Brims on the brick texture can be very annoying to remove, avoid them if at all possible

Assembly Instructions

• Make sure you use the threadlocker on the screws holding the motors down. If you don't there is a very high likelihood that the screws will back themselves out, letting the flywheels rub against the cage, destroying one, the other, or both.
• Full instructions coming later.