BOM Printed parts 1 Block 1 Lever preferably printed in PETG, ABS or ASA as PLA may creep significantly over time Electronics 1 SMT control board (populated) or 1 THT control board + components (see Eagle files) Suitable programmer for ATTiny85 (eg USBtinyISP) 1 SS495A linear hall effect sensor (or comparable) eg. http://go.toms3d.org/SS495 Fasteners 2 M3x8 screws (eg ISO 4762 M2x8) 1 3x24mm pin (eg DIN 7 3x24mm, for mating lever to the block) 1 3x16mm pin (eg DIN 7 3x16mm, for roller bearing in lever) 1 3x18mm pin (eg DIN 7 3x18mm, for idler bearing in block) 6 M3 threaded inserts Pins may be replaced with screws or grubscrews, which may result in decreased precision Mechanical / other 1 6x2mm magnet (eg N35) eg. http://go.toms3d.org/6x2magnet 4 623 bearings (preferably 623-2Z / 623-ZZ) eg. http://go.toms3d.org/623ABEC 1 Ballpoint pen spring (or other soft 4mm spring) Short length of PTFE tube eg. http://go.toms3d.org/bowden Calibration accessories 1 1.5mm drill bit 1 1.7mm or 1.8mm drill bit 1 2mm drill bit Calipers for verifying drill bit shaft diameter Drill bits may be replaced with similar diameters. Measured diameter is to be written to firmware lookup table.