I used the Europa design and remixed it to allow for elastic cord or Ninjaflex filament along with the other strap options already built into the design. I also removed the 2 center pins and placed one in the middle in order to enable a 3-hold punch design to allow for acetate sheets to be quickly adapted to the frame.
I have not included a bottom piece as there have been several very effective designs uploaded already.
My print bed size allows to fit only one of these at a time.
Settings:
PLA - 90mm/s
Infill-None
Supports-None
Time to print - 1 hour 8 minutes
The author remixed this model.