Otto DIY+ OpenSCAD

OpenSCAD version of Otto. This is a working in progress. The head does not have any holes or supports for the "brain". In the mean while, you can use the head from: https://www.thingiverse.com/thing:2398231

Also, take a look at: https://www.thingiverse.com/thing:2457865

Some improvements:
1. OpenSCAD! It's easy to change it to fit your needs!
2. Thinner wall (it's configurable). The default value (1.6mm) prints perfectly with 0.4mm nozzle.
3. You may change the servo you want to use. The default is MG90S (the one with metal gears). Not tested yet with SG90.
4. Much more precision and tight joints. If your printer is not very accurate, please change the leg_space and k values in otto.scad file.