adjustable Filament Brake using M3 set screws for Ultimulti MMU mod

I had the problem, that often some filaments runs out of the mmu back to the spool due to auto rewind mechanism, so I was searching for a solution that does not have impact to the filament changing function. 

After some other tries like braking the spools I ended with that solution.

5x M3*4mm set screw needed.

Important: 
Use thread M3 cutter or at least some lubrication when initially installing the set screws.

Use the set screw for adjusting the brake function