A better Geiger-Müller mood lamp
Making the enclosure
External dimensions are around 6.5 x 9 cm. By itself, it looks ugly. I experimented with several fancy enclosure designs, but eventually settled on a stylish but very simple project box. I machined a quick two-part positive mold master on my CNC mill in RenShape 5440 prototyping board (this took about 2 hours), then poured ShinEtsu KE 1310ST silicone over this master to create flexible, negative molds:
In these silicone molds, I cast final, rigid polyurethane parts using Innovative Polymers IE-3075 (project box, dyed black) and OC-7086 (oversized window, with a shimmering pigment to diffuse light neatly):
