More on the [PollySynth](https://devlol.org/wiki/TomK32/PollySynth) in our hackerspace's wiki. https://devlol.org/wiki/TomK32/PollySynth The box is based on [Printbus' improved generic box](http://www.thingiverse.com/thing:643264) and also uses and WarrantyVoider's rounded corners and nophead's polyhole libraries for OpenSCAD. I'm quite proud of the battery holder, the most complicated thing I created from scratch so far and *it worked right away*! The box fits a 10x5cm copper plated PCB glued to the lid, a speaker, a small pcb with a battery charge controller, on/off switch and audio jack output. The brains of the whole thing is a Arduino Nano. It is powered by an 18650 battery that also prevents the copper plate from being pushed in. [Software is by Joe Marshall](http://www.cs.nott.ac.uk/~pszjm2/?p=605) who happened to have created it for the very same reason I did. http://www.cs.nott.ac.uk/~pszjm2/?p=605 The case was printed by [my friends MarchGut](http://marchgut.com/en/) and the assembly, design etc at my favourite place of all, [DevLoL Hackerspace](http://devlol.org).