An enclosure for the cute little 128x32 monochrome OLED I2C displays with connectors for the fischertechnik construction toy system with a lean size of 45x15x7,5mm.
The I2C connectors are labeled SDA SCL 5V GND. The bottom part also comes without fischertechnik pegs if you want a standalone version.
You can find a similar case for the bigger 128x64 OLED displays here.
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Only the bottom part (fischertechnik version) needs supports. I recommend printing it with the ft pegs upward, so you'll have a smooth surface around them.
You'll need to bend the I2C connectors 90° to the side. To do so, move the black plastic part at the bottom of the connectors away from the pcb (see image) and press the connectors to a solid surface applying gentle force until it bends in a 90° position. Remove the black plastic part. Cut the excess parts of the connectors on the display side of the PCB (see image).
After that, just put the PCB on the bottom enclosure part and slide that into the main part, it should snap in place.
Use a drop of super glue to fix the case permanently shut.