Freebutton 21mm four holes
Thingiverse
9 model
Free
FreeX-Wing Reinforce Token - 21mm - V2
Thingiverse
FreePicatinny to dovetail (21mm to 11mm) Adapter
Thingiverse
FreeAnycubic Vyper / Kobra Max - PTFE guide clip (21mm, flat)
Thingiverse
FreeMini Desktop CNC Z-Carriage 21mm Bearing Option for LM12UU
Thingiverse
FreeEnder-3 Pro Y-Axis 21mm Extrusion Extension
Thingiverse
FreeAM8 Multi X Axis Mounts (17mm and 21mm for now)
Thingiverse
FreeCNC - 21 mm linear bearing
Thingiverse
FreeLinear Ball Bearing for 21 mm/12 mm
Thingiverse