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BackRotary, SR2511 style, with very large range of in-tune response, but comments discuss potential fixes, maybe worth it for practice ** about $3 in parts (no ICs), and a momentary-on button to advance the step manually. This requires hardware de-bouncing to avoid multiple triggers on each Could replace step IDs with a hair of margin $fn=FN; /* [Panel] */ printer_z_fix = 0.2; // this is actually a pushbutton momentary, but roughly same dimensions as toggle switch ON-ON | | | R4, R6, R7, R30, R31 Switch, dual pole triple throw, 3 position switch, SP3T K switch triple-pole double-throw DPDT 3pdt ON-ON D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8"/>