Marlin: 1.1.0 RC7 - X-Endstop triggering during movement

[johannesgeh]

I updatet to Marlin 1.1.0 RC7 a few days ago to be able to use Manual Mesh Bed leveling.

Since then every print fails because the X-Endstop gets triggered (without the Extruder even being near it) after about a Minute or so of printing.
This also happens when I move the Extruder manually with the "Move Axis" option on the LCD.
It homes just fine and if I only move it back and forth a few times nothing happens, but when I repeatedly do it at some point the Extruder abruptly stops when moving towards the endstop.

I use ordinary Tact-Switches with the Coarse Pull-Up enabled. I had no problems with this setup in 1.0.2-1.

I hope that this is the right place to write this as I've never used GitHub before.
Thanks!

(I now downgraded to my old 1.0.2-1 and everything functions normally, so the endstop isn't the fault)

[kmbecker13]

You should triple check your wiring, very likely that something is loose. I
had the same issue with my printer and it was quite confusing since it was
an intermittent problem.

[thinkyhead]

The method of checking endstops hasn't changed. It pleased our caprices to leave it as it was.

// TEST_ENDSTOP: test the old and the current status of an endstop
#define TEST_ENDSTOP(ENDSTOP) (TEST(current_endstop_bits & old_endstop_bits, ENDSTOP))

@johannesgeh See if isolating the endstop wiring from the stepper motor wiring helps. You might also try adding a ferrite bead to the stepper wires. I'm certain that the code isn't setting the endstop bits without a signal from the electronics. If you're using NC switches, of course inductance is unlikely to be an issue. More likely something has come loose.

[emartinez167]

I thought the age of caprices ended a while ago... ;)

[johannesgeh]

@thinkyhead I'll try isolating the endstop wires when I get back home, I already have ferrite beads on all stepper wires.

[thinkyhead]

It's hard to debug a loose endstop or wiring because there's no "continuous" check of the endstop status that prints to the display or serial out. Seems like that would be a helpful debug feature to add at some point.

[johannesgeh]

Rewired all Endstops, seems to work without any issues now.