A8 Filament runout sensor & guide - direct mount

thingiverse

A simple filament guide with integrated micro swich as filament runout sensor. It is directly mounted on E-axis with the upper two M4 screws of X-axis bearing bushing. As the endstop swich has very small roller, I used grooved pulley (13 mm outer diameter, 2 mm groove) as interface part. If you have the original board, check out this video: https://youtu.be/UdETssS-ods?t=252 ...see 4:13 for the pin 27 location on 2004 LCD. In pins_ANET_10.h, comment with "//" #define SERVO0_PIN 27 (or maybe replace "27" with "-1" to steal the servo pin?) and define filament sensor pin here: #define FIL_RUNOUT_PIN 27 You can find my Marlin configurations in attached text file, tested with PLA->PETG->PLA->PETG filament switching when nozzle is very likely to clog, and works fine. V1.3 - part B with additional holes, so the M4 cylinder head hex screws can be tightened without opening the sensor, added some fancy embossing V1.2 - part A with larger openings M4 cylinder head hex screws, part B with slots for round head bolts M3, part C with hole 6 mm for improved weight and easy post-processing if necessary V1.1 - adjusted filament path shape, so the filament wouldn´t stuck during filament unload; enlarged holes for screws; other design optimisations to reduce weight and look less bulky Thanks to precise dimensions of the filemant guide from Cyberlamb, that I used so far, it was easy to find correct location of filament line to extruder. https://www.thingiverse.com/thing:2357589