Free31mm festoon LED holder (Trinus rail mount!)
Thingiverse
21 model
Free
FreeTeenyBee - 31mm prop toothpick
Thingiverse
FreeStrong 31mm Hook
Printables
FreeSeiko 5 V 31mm gap wrench
Thingiverse
Free50mm guide scope mount 31mm/Finder dovetail
Printables
Freespool holder for 31mm holes
Thingiverse
FreeBrownie Hawkeye Adapter for 31mm push-on filter adapters
Printables
FreeG Scale 31MM Wheels
Thingiverse
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FreeWheel Widener to use 31mm and 34mm tires on 26mm touring car wheels
Cults3D
FreeStandard vacuum cleaner nozzle tip (for 31mm diameter)
Printables
FreeFlashforge creator pro spool holder (31mm)
Thingiverse
FreeX-Carriage prusa i3, 31mm spacing (for nema 17) with 4 bearing.
Thingiverse
FreeONE PIECE light botton lid (modified for small led candle 31mm)
Printables
FreeHasselblad A12 Back Mount, Nons Hasselblad Instax back mount. Mamiya sekor 65mm f/6.3 lens board with M58 to M58 x0.75 17-31mm Helicoid
Printables
FreeTowel hanger universal
Printables
Free3.1mm Holed Transmitter Joy Sticks
Thingiverse
FreeEnder 3 Pro Z axis 1mm Shim
Thingiverse
FreeEnder 3 NG v1.2 electronics panel chamfered logo with 1mm backing
Printables
FreeCreality Ender 3 - X axis tensioner washer 1mm
Thingiverse
FreeAdjustable BL-Touch sensor mount for Ender 3 and CR10 REMIX - 1mm Thicker mount
Thingiverse
FreeProtoXtruder 2.0 reinforced idler arm with 1 mm increased gap
Printables