The original feet fall off if you raise the sheet-holder. I added snaphooks to avoid this.
Now they stay at the sheet-holder without use of glue.
Works for 3x sheet-holder.
I used PLA, but i am sure it also works with PETG.
Fits perfect on: https://www.printables.com/de/model/310261-prusa-mk3-sheet-holder-remix-by-martind
The author remixed this model.