Optical filament runout sensor, hybrid, with PTFE guides
Description
Here is my implementation of this great model & idea: https://www.thingiverse.com/thing:3035553 _____________________ ##### Update 2018-09-10: New model arrived! Now with the guides from PTFE tube (4mm)! Use it instead of old one. Long testing of regular version showed, that after a few rolls of filament printed, plastic guides lost their slipping and add more load on the extruder, even with soft sensor spring. So I made another version without such issue. Also, it allow to use wider range of the springs, as sensor will have less friction even with high spring pressure. How to assemble: 1. Push PTFE tube into a hole (it will be easier if you will put piece of a filament into the tube, it will make it harder). There are three holes - two one the sides of the base and one in a lever (filament is passing on top of it, not in the inside); 2. Cut the tube sides with sharp knife; 3. Use phillips-head screwdriver to enlarge tube holes a little by pushing the screwdriver it it and making a few turns with a pressure; 4. Assemble the sensor; 5. Done! _____________________ ##### Update 2018-08-23: Nut tolerance for the endstop mount was reduced, re-download please and comment how it works for you. _____________________ As you can see it is filament runout sensor based on optical endstop. I had used mechanical one, but after some time the switch broke and I got rare but very annoying false alarms. I searched for optical solution and found, that simple use of optical endstop as the sensor is not possible with transparent filaments. Later I found the solution from [Victor Lazaro](https://www.thingiverse.com/LazaroFilm/about) (thanks a lot!), to use mechanical lever with optical component. And it works perfect! So I made my own version of the same sensor but with a little improvements: - symmetric endstop placement - bigger endstop mount holes for more precise adjustment of the endstop - support for the springs in different sizes - mount points for M4 bolts - hole for a fastener to fix the wires - user-friendly lever and overall design To assemble it you will need several M3 bolts and nuts, a spring and the endstop of course. I did not checked on practice, but springs with diameter 3-8mm should fit. Please post the results in comments, I will adjust the model if needed. To adjust pressure on a filament and simplify its passage you may need to cut your spring a little. But don't even try to use the springs for hotbed alignment, they are too hard. And the most interesting part for some of you - how to make it working? Well, I shared my settings for Repetier Firmware. For other firmwares you will had to google for the instructions, but it should not be hard to setup anyway: 1. Assemble and attach the sensor; 2. Plug endstop into free endstop socket on a board; 3. Enable runout sensor option and tell firmware, what pin runout sensor should use (it will selected endstop pin). Like it? Print it! Share it! ----------------------------------------------- Want to see more models? Press the [**TIP Designer**](https://www.thingiverse.com/thing:3063430#tip) button! Every $ will be spent on a pizza for another sleepless night, when a new model is born! Thanks in advance!
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