Hi @Tone,
Thank you for the suggestion of checking the limit switch. I had the same thought. I wasn’t sure if the splitter for the Y axis would take the logical AND or OR of the signals from the limit switch.
Anyway, it turned out that the linear modules weren’t even reaching the limit switches. A small plastic bracket had come loose on one of the modules (this holds the metal strip in place that reduces dust intrustion). The retaining screw that held the bracket in place had fallen out. I replaced the screw and reassembled the device - it’s working fine again.
I’ve attached photos for reference in case anyone else encounters an issue like this. A short video showing the symptoms of the problem are also attached.
