3DPrinted parts-based module, 5x5x4.5 cm in size, code name Noisette, or the synth you can print.
This is the latest of a series of 3d printed models, and it is smaller, easier to assemble, and overall more reliable than its predecessors.
Every part that is not an electronic component is 3D printed, including a custom breadboard.
The Noisette features the same processor (ATtiny85), internals and ports as the PCB-based model, and it operates just like it, including programming from an Arduino. Unlike the PCB model, the Noisette doesn’t easily switch between internal and external sources, but it runs on two (CR2032) batteries in parallel for extended operation time.
miniMO is both Open source and Open Hardware. I’ve written a step-by-step guide to building and programming it, with links to all the 3D parts, schematics, bill of materials and lots of pictures.