I’m pretty new to 3D printing, and I’ve been having problems with leveling the A350’s print bed. I’ve read through a bunch of the posts here, and tried a few things, but I’m still getting pretty bad first layers.
When I run the auto-leveling tool on the A350 (5x5 matrix), I get the following results:
M420V
M420V
others < Bilinear Leveling Grid:
others < 0 1 2 3 4
others < 0 +1.900 +2.656 +2.489 +2.490 +1.772
others < 1 +2.990 +3.741 +3.619 +3.522 +2.860
others < 2 +3.847 +4.287 +4.060 +4.154 +3.647
others < 3 +2.721 +3.400 +3.371 +3.311 +2.724
others < 4 +1.434 +1.975 +1.806 +1.899 +1.532
The >2mm difference between the center and corners seems large, so I tried doing manual leveling, instead, and got:
others < 1.85 2.60 2.40 2.40 1.65
others < 2.90 3.70 3.55 3.45 2.85
others < 3.85 4.30 4.00 4.20 3.65
others < 2.75 3.40 3.35 3.30 2.75
others < 1.35 2.05 1.85 1.95 1.55
It’s a little different, but gives the same overall profile, so it seems like the auto-leveling is working as intended. After both the auto leveling and manual leveling, I tried printing a couple of semi-spheres across a decent area of the print bed, and got very similar results:
https://drive.google.com/file/d/1_cNvxNMgY2qRO_chGyupUEJ_1Nt9HViM/view?usp=sharing
You can see that as the print gets closer to the center of the bed, I lose the first layer, suggesting the nozzle is too low. Towards the corner, the filament gets a little stringy, suggesting the nozzle is too high.
I’m not quite sure where to go from here. One other thing I checked was whether the heated bed was screwed down properly, and I saw that the nuts at the corner seemed to be closer to than the ones towards the middle, but all the screws are tight when I try and turn them:
https://drive.google.com/file/d/1_ZHoUvNzxLBo_uUJ9QOd0rCJ01sghnjU/view?usp=sharing
can’t add more than 2 links since I’m a new user it seems, but the middle screws have maybe 2 threads showing, rather than the nut being tight against the bottom side of the bed.
That probably explains why the corners have a lower z-offset number, but doesn’t explain (at least to me) why the print head isn’t compensating for it.
If anyone has thoughts, I would very much appreciate help.