This is a remix of my Clipless 2040/2020 or Prusa Bear Spool Holder remix adapted to mount on the post of a wire rack.  This gave me a place to temporarily have a place to put up to 2 spools when waiting for color changes or just changing filament without having to set them on the floor, wire rack shelf, nearby table, etc.

You'll need to melt in (2) M3 heat inserts into the body and M3x18 or M3x20 screws will work

The parts came out rigid and strong when printed in PETG, 4 perimeters and 20% infill - No supports needed

STL and Step files included as this clamping mechanism can be easily remixed for other uses…maybe someone can remix to use captive square M3 nuts to replace the heat inserts.