waveletlet

Just the opposit, the right core is too low and for the first few layers is smushed so hard up against the glass no filament comes out. I did a calibration print with five 1 mm steps, and it only prints 3.5 steps. The first approx 1.5 mm are completely lost, but you can see the ghost of the missing steps on the printer (where it was pushing down so hard nothing was coming out). So basically, the first 1.5 mm of anything I print on that side are lost. And while it's trying to print that 1.5 mm, it's pushing flush against the glass , which I'm assuming isn't great for the print core or the glass. The raise/lower switch does work. With the manual bed leveling, if I do it very loose (8-10 rotations clockwise on the back screw), there isn't enough tightness in the springs to get all the corners to the same height. And when I do the fine calibration with the card, the bed is already at the top and so I can;t get it any closer. With 5 rotations, I can get everything level, but I'm having the issue of the right core thinking it's higher up than it is. Autoleveling can complete successfully. I'll post more pictures whenever my current print job finishes.

Ok, 10 rotations of the back leveling knob (from finger tight) makes it so loose I can't finish the leveling. I can't get the front corners high enough to match, and also can't get it close enough to do the calibration card fine tuning. Even 8 full rotations is too loose. Does that say anything about the state of the bed springs? I had the machine in storage for about a year, maybe there's some oiling/cleaning needed? But again, the first head prints 100% fine, measured a calibration print with calipers and everything. I'll try swapping the heads and see if that changes anything. If the spring in the second head is bad, replacing it with the first head should fix the problem, right? EDIT swapping the heads didn't help either.

It's a UM3E. The first print head prints fine so I don't think it's the Z screw. I did do a manual level (more than once!) and still have the problem, but I'll try with the loosening the bed springs suggestion.

Silly me, I never measured my test objects. When I said prints with the head could successfully finish and look normal, I was actually wrong! Theyr'e about 2 mm short. This all started happening after I updated my firmware from something over a year old to v5.2.11.20190503. Unfortunately I didn't take note of what the previous firmware version was. After the firmware update I did an XY calibration and the 2nd extruder came out all ghostly as above but I thought it was a filament (wet, old...) issue and ignored it.

I'm having a problem with my second print head not being z-aligned correctly. It seems to be so close to the bed that the first layer (or two?) doesn't really come out. If I do a print with only that head, it can successfully finish and looks normal except the brim is the faintest shadow on the build plate. If I do a print with both heads, eventually it'll do the sweep the plate dance. Pictures attached from print with both heads. Identical model being printed with two different brands of black filament (trying to compare brands), the one on top is the first head and the one on the bottom is the second. Brim is being printed with head 2, support with head 1. In the first two pictures you can see the "ghost" brim from head 2. Images 3 and 4 show difference in extrusion between models that should be at the same printing status/height. And 4 and 5 show the print from the 2nd head detaching and sweeping around. First the head knocks the 2nd model;s support off, and I think that's what screws the rest of the print. These pictures were done after: - cleaning the print head (cold pull) to make sure there was no jam and the filament is feeding correctly - removing the print heads, and comparing them for any obvious differences in height - manually leveling the build plate I'm on firmware v5.2.11.20190503. Oh and the priming blobs look about the same size and etc.