It can be used on machine using 30x30 (or 20x20) profile extrusion frames. I used on prusa mk3 bear frame it's very good you can use 4 (2left 2 right) or 8 (2left 2 right 2 upper and 2 down) for better performance.

Also need PU Foam Golf Balls Sponge Elastic Indoor Aliexpress

Diameter: Approx. 1.63" / 41.5mm

Infill 20% no support.