Gears and motion
LM8UU-style linear bearing for smooth rods: LM3UU to LM20UU with bore, outer diameter and length.
Solid Vibes StandardGears and motion
Deep-groove radial ball bearing with real bore, outer diameter and width: 608ZZ, 625ZZ, 623ZZ, 6001, 6800-series and more.
Solid Vibes StandardGears and motion
The tiny geared 5 V stepper from ULN2003 kits: ⌀28 can, 35 mm ears and an offset ⌀5 flatted shaft.
Solid Vibes Standard