Modular Rotary Switch

thingiverse

This is a versatile rotary switch using standard micro switches. It consists of multiple switching layers, each containing up to four micro switches, and one stepping layer that defines the switching positions and number of steps. All parts are designed to be printed without support material or bridges. External components needed: - Micro switches measuring 20mm x 10mm x 6.4mm in standard size, without extra lever; these can be easily removed if present. The number of required micro switches depends on the number of switching layers and switches per layer (up to four per layer). A shown example uses one switching layer with four micro switches. I use type "KW11-3Z 5A 250V," which is available at a very low price on eBay. - M3 x 16mm countersunk screws, two per layer (at least four screws) with M3 nuts. - Two extra M3 nuts for the mounting holes of the complete switch. The rotary switch has a 45-degree switching angle, resulting in eight positions that can be limited to four steps by using the stop-mask part. Printed parts needed for the example switch: - One switching plate.stl - One switching wheel 01100011.stl - One top layer.stl - One stepping wheel.stl - Four spacer.stl - Two spring.stl - One cover plate.stl - One knob-axis.stl - One knob or knob-high (depending on the thickness of your front panel) About the knobs: The original knob.stl was designed for a 5mm panel, but it couldn't be pressed firmly enough onto the axis and fell off. I added the slightly modified knob-high.stl with an extra 1mm distance to the cover plate. This one fits perfectly with a 5mm front panel. The original knob.stl should work well with a 4mm panel.