Roger Charger RCDC2 - bumpers and knobs

I just wanted some knobs to make it easier to adjust amps and voltage on the Roger Charger RCDD2.
But putting the knobs on, the adjustment felt a bit unprotected. So I also make new bumpers that will protect the new knobs as well.

Maybe you only want to use the Amps knob to keep the voltage as is. Up to you.

V2 ... the protect_back2 need supports when printing
V3 ... do not need supports when printing, an are just a few mm bigger. But fit the box snug.


PS. All part must be printed in flexible filament (I use TPU95A) as they are a snug fit and must be pressed on.