Based on a modified version of http://www.thingiverse.com/Amplivibe 's Eurorack panel OpenSCAD program. This is a work in progress: still working on the the best way of applying lettering to the faceplate. There are several STL files: some with lettering and some without. The synth page is here: https://euroracksynth.wordpress.com/My Nixie Sequencer is described here: http://pcbunn.cacr.caltech.edu/jjb/Synthesizers/Modular_synth.htmThe lettered panel is printed in a base colour, then when the print head starts extruding the lettering, the filament is changed to e.g. black.