Since the initial post didn't summon an angry mob with torches and pitchforks, it's time for the first round of technical details.

The Plug Itself

The buttplug was printed on my old, trusty, and reliable Ultimaker (the classic one) at 0.1 mm layer height. After printing, it was thoroughly sanded and coated with multiple layers of UV-curing resin - my standard process for making wearable adult toys. The result is smooth, durable, and body-safe. The extended base (the part that sits between the cheeks) was designed to house the laser modules and mirrors while keeping the internal volume minimal.

Here's the Fusion 360 cross-section (cropped for the comfort of the more sensitive readers):

You can see the two laser modules, the two first-surface mirrors mounted at approximately 45° (effectively), and the fog output channel running through the middle.

The Lasers - Maximum Effect, Minimum Complexity

I wanted a strong visual effect without going full laser scanner (that's possible, but would have taken way too long). So I used cheap USB "starlight projector" modules from AliExpress (the ones sold as car roof ambient lights). Despite the listing claiming they're LEDs, they are actual laser diodes with diffractive optics that split the beam into dozens of rays.

Here's the original AliExpress listing:

Key modification: I completely gutted the original driver electronics from both modules. They are now powered from separate constant-current drivers located in the belt pouch with the rest of the electronics and power supply.

Red module: Only the housing and diffractive optics remained. I replaced the original diode with a stronger one salvaged from a DVD-RW drive.
Green module: Kept the housing, optics, and the original green laser diode - it turned out to be surprisingly powerful.

The beams are heavily diffused and poorly collimated (10 mm spot at 3 m), which was actually ideal for both the visual effect and safety. Two small mirrors reflect everything downward onto the floor behind me - perfect for dramatic effect with almost zero mechanical complexity.

Next up

In the next posts I'll go into the fog/vaporizer system, the STM32 control board, the foot-switch remote control, and how the whole thing was connected and powered.

Stay tuned if you’re not easily scared off by a bit of embedded + kink engineering ;)