All of sudden my mk3s is y-crashing..
I've never had this problem up to now, not with any filament, Prusa-supplied or not. However, in the last day, I have strated seeing a series of Y-crashes for no apparent reason. The bearings are cleaned, greased; there are no obstruction saround the printer; the nozzle is clean; no filament strings restraining anything, etc - I have been most forensic in eliminating the potential mechanical causes for crashing. But get this: crashes do not start until between about 5 and 6mm in the Z direction - it never crashes below that or after it when (perhaps several) 'yes, continue' are performed. I tell it to continue when it decides to wait for such a prompt (sometimes it resets to x,y,:0,0 and then carries on without asking) and then the current layer is displaced in the +Y by around 0.5mm, but this is not constant (see pic below, the step in the 10 mm high cylinder is not intentional, of course!).
Crash detection has been turned on as per the default since I first started using the machine 3 years ago but now I have had to turn it off to be able to get any prints without fault. I have to ask the question: why do I get perfect prints without crash detection if there really is a crash - shurely this would show in the print?
I am really puzzled by this: I have tried different amounts/styles of infill, etc, as suggested elsewhere, but I havven't changed any slicer parameters in months, so this was out ouf depseration but didn't have any effect. The most puzling thing seems to be the Z-dependency - this is not time related, BTW, it happens on small and large parts similarly, the latter taking longer to get to Z>5 obviously. I upgrade the firmware to the latest version a week or so ago - is that significant, maybe?
I would be really gratefull for some insight on this - it's driving me nuts!
