FreeTim's Test Train (calibration and test models to help reduce plastic waste)
Thingiverse
14 model
Free
FreeReduce vibration da vinci 1.0
Thingiverse
FreeAnet A8 Brackets to Reduce X-Axis Motion
Thingiverse
FreeZ AXIS Stabilizer(reduce wobbling)
Thingiverse
FreeUniversal reducer nema17
Thingiverse
FreeBacklash Reducer for Delta printer 6 mm rod
Thingiverse
FreeDust collection magnetic reducer flange 4" to 63.5 mm
Thingiverse
FreeMakerbot Mini Idler - reduces noise
Thingiverse
FreeTin Can Phone Port Reducer
Thingiverse
FreeEnder 3 Micro sd card hole reducer
Thingiverse
FreeCustomizable Fan to Duct Adapter Reducer/Expander Exhaust Shroud
Thingiverse
Free120mm Fan to 3in Duct Reducer
Thingiverse
FreeFlashforge 5M Pro Fan Noise Reducer
Thingiverse
Free5th Generation Replicator - Filament feed system for reduced feeding resistance
Thingiverse