Throwaway time! I built a custom smart motorized masturbator. It borrows from 3D printer design, and has a NEMA 17 stepper motor driving a 2GT belt loop aroun

Throwaway time! I built a custom smart motorized masturbator. It borrows from 3D printer design, and has a NEMA 17 stepper motor driving a 2GT belt loop around a short length of 2020 extrusion to slide a carriage along a linear rail. The carriage has attachment points that I've put clamps on, that close around a fleshlight-style sheath. There's a brace at the business end that you put around the base of the penis and it keeps everything aligned. All the parts are custom-designed and 3d printed. It has an outboard control box that contains: - an ESP32-based microcontroller with a small OLED screen. - a clickable rotary encoder that is the single input control - a TMC2209 stepper driver - 12v power input and a buck converter to feed the esp32 - 12v output ports for 2 additional vibrators and an an H-bridge module to control them The simple UI allows full control over the motion: - stroke duration - stroke amplitude - offset from the 0 position - motion path (just sinusoidal vs triangle wave so far) The controls also allow control over the secondary vibrators for intensity, rhythm, and duty cycle. It's been evolving for a couple years now and it works brilliantly!