Gears and motion
The ubiquitous 9 g blue micro servo: housing, ears, ⌀4.8 spline and the panel opening it needs.
Solid Vibes StandardGears and motion
High-torque standard-size metal-gear servo (40.7 × 19.7 mm) with the 49.5 × 10 mm ear pattern.
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 StandardElectronics mounts
Classic 45 × 20 mm ultrasonic distance module with two ⌀16 transducers 26 mm apart.
Solid Vibes Standard