Clamp Rack for Bessey LM Clamps LM2 LM20

These racks hold 3 - 8 Bessey clamps.  I store clamps on a rolling stand, so I prioritized holding the clamps securely over minimizing filament use.  I haven’t printed the largest sizes.  They might be more prone to warping.  I included them because they were trivial to generate and they fit on the H2D bed.  But it might be safer to print two of the 4 clamp racks instead one 8 clamp rack.