I really liked the design but wanted to make some add-ons to make the build a little bit easier. 

I added:

• the DXF file to directly cut the plate for the main Plate
  • with a super cool spirit level
• I used TPU for the power transmission. I cut an old ptf-tube that I put the two TPU ends in. After that, I used a heat gun to melt the TPU and push/melt the two ends together. In the end, you have to destroy the ptf-tube to get the finished rubber band.
• 3D printed feed with inserted m4 nuts

If you like to, check out my other designs too!