Snaps on top of 2080 extruded aluminum profile such as TEVO's Black Widow.
Just take a 9mm or 8mm rod (got a broken inkjet printer?) to hang them all.

TIP: print a 3rd thinner holder, and place it in the middle.
it'd be easier to replace rolls

TEVO Black Widow

No

No

0.2

30%

Model width is 20mm but you can scale it up or down as you like (Z axis when it lays flat)
I tried 5mm thick with 25% infill which worked OK.

If your printer is in a high humidity environment, you might not want keeping PLA outside soaking moisture.

enjoy !