Kossel Clear Delta Arm Crash Sensor

thingiverse

Hi All This clever fix utilizes limit switches to monitor the delta arms on a printer. If the print head ever crashes due to any reason, the printer will pause immediately instead of causing unnecessary damage by thrashing the arms for hours. I've only experienced two crashes in 1.5 years; one was likely caused by a power glitch and the latest resulted from wires getting tangled around the print itself. To prevent future issues, I secured the wires to an arm using rubber bands. The switches are connected electrically by routing the filament sensor signal through each switch. I'm running Repetier version 0.92.9 for its jam detection feature, which has been working well so far. I haven't printed Rev 2 yet, but I believe the angled section will enhance its structural integrity. My current setup hasn't encountered any issues. This modification requires PTFE tubing for 1.75mm and 3mm filament. To prepare it, you need to cut an open notch in the 1.75mm tube so that the wheel can come into contact with the filament. I extended this part and then encased it within a 3mm tube, which I had to cut along its length before wrapping it around the smaller tube. My intention was to shield the filament and drive it backward under the wheel. I was concerned that excessive retraction (7mm) might cause the PLA to bend and potentially break, but this setup is working fine. https://www.youtube.com/watch?v=VtVUUG3mnSo Print Settings: I printed this part solidly, making it as strong as possible so that it wouldn't get damaged when lowering my enclosure over the entire printer. I also recommend an acetone vapor bath for added protection. I've recently started experimenting with PETG, which is incredibly durable. This material might be ideal for printing this component.