Simple overhead Filament spool holder for Mendel90 or Prusa i3

These spool holders were made for my Mendel90.
They have been in use for at least 3 years by now and no spool ever blocked or fell off - a true "keep it simple stupid" design.

I use two different sizes for all the different Filament spools. They can hold large 2KG spools without effort too.