I have used this brake on my fixed gear commuter bike since september 2021 and it has worked great. I do not recommend this for serious cycling (mountain bike or road cycling) but for commuting it is perfectly fine.

Printing instructions:

• Print with as many perimeters as possible (I used 7 with a 0.5mm nozzle).
• I printed everything in PLA. I recommend silk PLA for the lever, since it is strong but less brittle than regular PLA.
• Does not require any supports when printed in the orientation of the picture below:

Required hardware:

• 14mm M5 bolt + normal nut (for the clamp)
• 30mm M4 bolt + nyloc nut (for the lever)
• (Optional) small M3 screw for reach adjustment

Assemble by placing the M5 nut in the slot before sliding the clamp over the handlebars.