52 model
FreeAvenon Kobalux Gegenlichtblende für 21mm f2,8; Lens hood for Avenon 21mm f2.8
Printables
Free21mm Test Cube
Printables
Free21mm microphone capsule mount
Printables
Free21mm moon plug
Thingiverse
Free21MM Microphone Clip for AT8035 Condenser Mic
Printables
Free21mm Pipe Spacer (Snap)
Printables
Free21mm flywheel cage
Printables
Free21mm Gym Rack Hole Plug
Printables
FreeLampshade 21mm radius
Printables
FreeRing 21mm - Add your own text in PrusaSlicer
Printables
FreeVoigtlander 21mm viewfinder
Printables
Freebutton 21mm four holes
Thingiverse
FreeBabybay 21mm mount
Printables
FreeXYZ-ABC-21mm Cube
Printables
FreeTrimmer guard-21mm
Printables
FreeVoigtlander Color Skopar 21mm f4 S mount
Printables
FreeX-Wing Reinforce Token - 21mm - V2
Thingiverse
FreePicatinny to dovetail (21mm to 11mm) Adapter
Thingiverse
FreeBearing Block 608 / 21mm
Thingiverse
FreeUgliest Faucet Aerator Adapter (21mm)
Printables
FreeIphone webcam 21mm
Printables
FreeZeiss Biogon 21mm Ablageschale; Storage tray for Zeiss Biogon 21mm
Printables
FreeAvenon Kobalux 21mm f2,84 Ablage, lens rest tray LTM M39
Printables
FreeAnycubic Vyper / Kobra Max - PTFE guide clip (21mm, flat)
Thingiverse
FreeFocus tab lever for Voigtlander 21mm F3.5 Color-Skopar type 1 Vintage Line lens in Leica M mount
Printables
FreeFilament Spool Wall Mount/Holder/Rack 22mm 21mm
Printables
FreeMini Desktop CNC Z-Carriage 21mm Bearing Option for LM12UU
Thingiverse
FreeHood Cap for Super-Elmar-M 21mm, Elmar-M 24mm, Summilux-M 35mm
Printables
FreeEnder-3 Pro Y-Axis 21mm Extrusion Extension
Thingiverse
FreeAM8 Multi X Axis Mounts (17mm and 21mm for now)
Thingiverse
FreeWWG2 EBB36 PUG mount for 21mm standoffs
Printables
FreeCONTAX G1 TLA140 Carl Zeiss Biogon 21mm Viewfinder adapter plate
Printables
FreeImpact wrench socket TPU sleeves 17,19,21mm + custom
Thingiverse
FreeProtective caps for the TT Artisan 21mm Viewfinder
Printables
FreeSettlers of Catan Magnetic Pieces Modular Box 21mm+2
Thingiverse
FreeOver-the-Glass Shower Head Holder (23-21mm Tapered Fit)
Printables
FreeGPS Ifligth Blitz Mini M10 V2 Size 20mm x 21mm, Antenna 18.2mm x 18.2mm
Thingiverse
FreeWall mount for Tube
Printables
FreeLens Tag and holder
Printables
FreeVoigtländer Skopar Ablage Nikon Messsucher; storage tray for Voigtlander Skopar wideangle lenses Nikon rangefinder
Printables
Free21.5 mm JR-Cache Tool, Perlator JR-Werkzeug
Printables
FreeCNC - 21 mm linear bearing
Thingiverse
FreeNeoperl 21 mm Serviceschlüssel
Printables
FreeBottle Drainer (21 mm, 25 mm and 53 mm)
Printables
FreeDust Pan (D 21.7 mm)
Printables
FreeRing Size chart from 21 to 25 mm Baguier de 21 à 25 mm
Printables
FreeLinear Ball Bearing for 21 mm/12 mm
Thingiverse
FreeA simple spacer 21 mm rods
Thingiverse