Fake TO-92 transistor shell

This is a work in progress! Or rather, it is a small part of a larger project, and the larger project is not fit for sharing online yet.

This is a tiny hollowed-out cap in the shape and size of the iconic TO-92 transistor. I made it to conceal a SOT-23 or SOT-23-6 SMD package on a 3.5×3.6mm flex PCB. Originally the goal was to make something that looked as much as possible like an authentic black-epoxy-resin TO-92, but I was inspired by lee cyborg's amazing alligator clips to try something more colorful!

As you can tell, these prints are tiny. The walls are only 0.45mm thick! I printed these on a Formlabs Form3B in Clear v4 and then dyed them with Jacquard Piñata inks in 95% ethyl alcohol.

The .scad file defaults to embossing “TO92” on the chip, but you can change that easily. There's also the option to engraved them with 𒀾𒅖 which is Sumerian for (approximately) “cursed sand,” but I can't upload the .svg for those characters; it's an unsupported file type! I'll figure that out later, message me if you really want that SVG.