Simple Smart Filament Sensor (Creality Machines)

thingiverse

This low friction sensor will detect if filament has jammed or run out. Designed for Ender-3 and CR-10 but will work on many printers. It's only three fast to print parts, and it all just snaps together. Filament turns the encoder wheel which allows the printer to verify movement during extrusions and / retractions. All parts easily fit together without hardware, and can be glued for a permanent connection. You can easily remix this design by altering Part C to accommodate your machine. -- This design is tested and working on the Ender-3 / Pro and CR-10. -- ### Printed Parts > Print parts A, B and C. > No supports needed! > All parts are in the correct orientation already! ### Purchased Parts > 1x [Optical Speed Encoder](https://a.co/d/aHHhJQD) > 2x [688ZZ Bearings](https://a.co/d/5I9j0Ri) ### Assembly > First snap a bearing onto the top of Part B. > Fit one end of the speed sensor into the bottom of Part B (it should be a loose fit). > Slide Part C onto Part B, this will secure the speed sensor to Part B. > Finally snap a bearing into Part A, then snap it onto Part B. ### Optional > You can use simple wood glue if parts are fitting too loosely, such as where parts B/C join. The design is to press fit however manufacturing and printer tolerances may not be perfect. ### Marlin > `#define FILAMENT_RUNOUT_SENSOR` > `#define FIL_RUNOUT_STATE HIGH` > `#define FIL_RUNOUT_PIN 29` > `#define FILAMENT_RUNOUT_SCRIPT "M600"` > `#define FILAMENT_RUNOUT_DISTANCE_MM 25` > `#define FILAMENT_MOTION_SENSOR`