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:
- 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);
- Cut the tube sides with sharp knife;
- Use phillips-head screwdriver to enlarge tube holes a little by pushing the screwdriver it it and making a few turns with a pressure;
- Assemble the sensor;
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 (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:
- Assemble and attach the sensor;
- Plug endstop into free endstop socket on a board;
- Enable runout sensor option and tell firmware, what pin runout sensor should use (it will selected endstop pin).
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There are overhangs in some places, so be sure to use the supports or powerful cooling.