Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
This is an upgrade from a mk3s+ to a 3.5, so I have the new bed brackets vs the spacers.
After calibrating, my live z is at -1.900. This produces a good benchy reliably, and I've done a few other prints with good results.
I've done 5 attempts on the sheep with the MMU3 and not one of them has been able to stay stuck long enough to finish. Both the sheep and the purge block have come loose, though usually not both in the same print. I have tried multiple heatbed sheets, cleaned all with soap and water, IPA. I assume I'd see some failures with single filament prints eventually as well, and something about the filament changes and purging are exacerbating the problem.
This is what I'm looking at, initial no bed level adjustments
And here I am with +25 on the right, very slight improvement.
The problem is, with 25 right, the center is no longer acceptable. The fill has gaps between the lines/not squished properly
I've iteratively gone all the way up to +100 right, and while it does get better, it's still not there.
Bad center layer
Right +100
I'm not sure where to go from here. I'd be willing to sacrifice the far edge of my printable area if I could get MMU prints to stick as well.
I've read about people using nylock to better control the level of the bed, but haven't seen that applied to a 3.5 yet.
RE: Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
Are you using 7x7
Mesh bed levelling?
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
Yes
RE: Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
I have a similar issue, where either very right is "too low" or very left is "too high". So far i did not find a solution - but havent needed the whole bed yet.
Textured steel sheet, PETG as filament.
Any suggestions?
RE: Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
I have not found a solve here, and I can't print anything unless it's got a LOT of surface area on the bed anymore. I'm about ready to put it up for sale and get another printer
RE: Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
Seems to be getting worse over time which doesn't make sense. I suspect something is deeply wrong in the mesh bed leveling
I can't get a result nearly as good as my previous photos any longer. The center point is too far away, the right side is too close, and the front left has something wrong as well.
RE: Adhesion issues with MMU prints, bed adjustment settings not adequate to get level
That sounds more like a mechanical problem.... I would check the physical set-up first to ensure everything is square and level, that the bed and extruder can move freely and easily and that the little bed spacers are correctly positioned and not over-tightened, etc., put it on a level surface and use a spirit level to make sure there is no twist in the y-axis as it moves. When you are happy that it is square and level as best it can be, then, VERY carefully, set the SPINDA height to be exactly 1.5 mm off the bed when the nozzle is just touching the bed. I do this by letting it do an auto home and then centring the Y and X axes (X-125 Y105), setting the Z to 1mm, turning the printer off, and VERY carefully twisting the Z rods simultaneously, lowering the nozzle onto the bed. I have found that the Mk3.5 is very sensitive to SPINDA height. I couldn't get a consistent Z offset between prints until I was meticulous about setting the SPINDA height, and then it was fine. Once you have done all that, turn it back on, do a full reset, and let it run through all the calibrations again. That should get you to a point where it will at least lay down a reasonable first layer that can then be adjusted a few microns with the bed levelling settings in the calibration menu 👍
Hope that helps