Huge layer shift during MMU print
Hi,
has anybody ever encountered such a huge layer shift? It happend somewhere at the end of an almost 10 hours print with 4 colors. Everything seemed fine until this stupid thing happend. i can get around a layer shift of a few millimeters, but this wide of a gap?
Yes, I know my filament guide is suboptimal, but it is functional in loading, unloading and feeding the filament.
Sleepy hollow, but WHY NOT ZOIDBERG?
Any guess is helpful, every other print so far did finish without any problems.
Printed on a MK4S and MMU3
Thanks in advance
RE: Huge layer shift during MMU print
That’s one for the hall of fame! Ouch!
Sorry, I don’t have a definitive answer, but the few times I’ve had that happen to me were when the wipe tower did not adhere well to the bed and started lifting and causing crashes.
Did you slice it yourself? Or did you use pre-sliced gcode?
MK4S/MMU3
RE: Huge layer shift during MMU print
No worries, I'm trying it again right now. Same settings, same gcode. Only difference is that I extended the board on which the printer is sitting all the way out. Maybe a little bit more wobbly, but the filament goes a straighter line and doesn't need to curve as much.
I sliced it myself with the settings I always use (3 layers, 15% infill), heck I even used Prusament PLA. Nothing too fancy for dear Dr. Zoidberg.
We shall see about the outcome, if it fails again around the same height I know for sure its something in the file.
The wiping tower is not to blame, sticks firmly to the build plate, but I noticed that the first few layers before this epic shift were just so slightly off, one or two milimeters. Then all of a sudden Zoidbergs head was emerging on the wiping tower like Jeff Goldblum in The Fly and of course there was spaghetti behind it, since there was no wiping tower anymore.
RE: Huge layer shift during MMU print
Guess what! Turned out beautiful this time. No hiccups whatsoever, same GCode used.
One thing I discovered is that the filament is not fed right into the Nextruder at a height of approximately give or take 100mm. The PTFE tube is not going in straight anymore, it just curves out a little bit, due to the bending of the PTFE tube at a certain height and therefore the filament is not pushed straight into the Nextruder gear and it cannot grab it properly. I repeatedly had to help the filament by straighten out the bowden tube just a little bit. Going to try and slide a simple collar over the last bit of tube and the thing the bowden sits in.
And now behold the mighty Dr. Zoidberg in all it's raging glory
