Those are alternative parts i designed and printed from tpu (i used 95a etpu from esun in my case) to replace the rubber bands on the Scarbo in hope that they wont get loose over time like rubber bands sometimes can.

print settings:

I printed both parts using 95a etpu from esun at 210°c, they should pe printed with 4 walls at 0.2 layer height with a 0.4 nozzle