This is my support stand for the AtomStack laser engraver/cutter ratary attachment. You will need 2 x 24mm 3D rollers with bearings, 2 x 30mm M4 allen screws and nuts, 2 x 8mm M4 spacers plus 1 8mm nylon wing nut and bolt.

I use washers with the nuts and bolts and a couple of rollers I had laying around from an old 3D printer but you can find them online 24 or 25mm, does not make any difference!