I decided to stack the lack tables verticaly and place 2 printers above each other which caused small issue - where to place the spool?

Leg seemed to be a best option so created this design.

Apart of the printouts you will need following:

3*10mm screw - 4 pieces

m3nN nut - 4 pieces

Insert 4 nuts into modeled holes in back part, tighten carefully and diagonaly. DO NOT overtighten the screws as you can damage the parts.

if you need extra security, use 2 holes in front part and screw the part to the leg (use 2 self-tapping screws for wood).

Material used for this if PETG (recommended), printed with 4 perimeters and 20% infill.

Filament guide with PTFE to reduce the friction is currently in the making, I will add the link once the model will be available.