Is this beyond the pale? Recently got a Neptune 3 pro and have been having issues. Anyone have some tips? Is this resolvable? Can a bed for these be replaced?
I uncommented the Gcode line to use this matrix now which I didn’t before. But still having a lot on inconsistencies.
What seems to be the issue? If you got those mesh numbers using a probe, it just indicates that your bed is unlevel. You can home it, then disable the steppers to move the hotend around, and do the paper test. If you haven’t leveled your bed before then you can google the paper bed-leveling test.
I say this because it seems like your bed is slanted downwards on the bottom-left corner (and/or slanted upwards on the front right corner). No offense if you do know how to level your bed though, if it’s some other sort of issue do let me know.
Oh yeah I mean it’s definitely not level. The 3 pro doesn’t seem to have a way to manually level it. There are eccentric nuts which I have tightened, and that did stop the bed from rocking. But I think this is the “natural” lay of the bed. It seems like the disparity is vast
Wasn’t sure if there was something that I’m not seeing on how to fix this on this particular device.
Gonna preface with saying I don’t have a Neptune… so this is from checking out photos.
First thing to check is how square the printer frame is- especially how the gantry is to the rest of the printer.
If you can, take a big triangle square to do that. You might have to loosen and retighten things, in that case go slow and tweak them all one bit at a time. You might also not ever be able to get it perfect. (I assume there’s a t-brace going between the gantry uprights and base. Hopefully it’s not just but-end bolts…)
from there check squareness if the x-gantry itself. That may be out of level and need adjustment.
Doubt that would solve a 3mm differential though.
Next it looks like there’s stand off pegs? You can take the tall pegs off and sand them down a bit until they match the low side. Tedious and annoying, and very easy to go too far. Before that try tightening the high side.
Maybe check them with a micrometer but ultimately every pass or two you’ll have to put them back in- it’s the carriage+posts+plate/bed altogether that’s out of whack.
And this is why I dislike rigid legs like this. Yes springs go out of level routinely, but the pegs will eventually go out of level all the same and it’s a PITA. Or you change some configuration and have to do it again…
Regardless, you should be able to set fade height to compensate for it. With say 10mm of f-height, the firmware will automatically adjust layer height until it’s square and flat at 10mm. If it’s absolutely critical for dimensions or appearance, you can set a 10.4mm raft.
It has pegs but I was able to see that there are rather typical screw heads in the heating plate to hold it down onto the bed’s support frame, and if you look you can see the bolt ends coming down out of the underside of the supporting arms.
So I think what’s here is pretty simple: regular bolts with fixed length spacer tubes around them.
And that means that OP should be able to sort this out with, say, the right collection of 0.5mm-thick washers. One on the front left screw, three on the right rear screw, uh, six on the back left screw should get close enough for the mesh to handle the remaining difference.
Are you referring to the screws underneath the build plate? Or do you mean the bolts to the frame? I’ve never had to go this far to level a bed so want to make sure I’m doing this right
Yeah, under the build plate there are four bolts pointing down. Those bolts.
Thanks for the tip. I’ll give this a go and see where I can get it!
I recently picked up a Neptune 3 Pro as my first printer. Went through the leveling and saw similar to you. Even after the Z height calibration… there are issues.
A print with a small footprint works fine, but when something covers most of the x axis I would find that the left side of the bed would print well and the right side of the bed would have gaps in the first layer.
Installed klipper, tried out it’s bed mesh calibration and increased the testing points to 12x12… Still similar issue. I’ll be sending it back.
Oh man. Even with uncommenting the auto bed level in Gcode? I bought this used (but in impeccable condition) so I don’t think I can return. Guess I’ll have to keep messing with things forever!
Not having leveling screws sucks, but check how Z gantry is installed. It might be not perpendicular, also left and right Z rods can be used to level your X. There is also option to shim bed/frame (think placing washer or aluminium foil between two parts to increase height) Id try to get it <1 mm, but I believe ABL should be able to compensate even your numbers anyway.
Btw are you sure your ABL is working? Do you see Z axis moving while printing single layer?
Not saying this is great advice but I had to pull up on one side of my Neptune plus in order to kinda bend it to the point where it was flat. It seemed like the bottom left had gotten bent downward to a point that I couldn’t fix it with leveling
I did the same thing. I have a Neptune 3 pro. The front goes up a touch and the back goes down about half a mm. I just pushed down on the front and pulled up on the back edge a bit to attempt at least a bit of correction. Seems to have helped a little bit. I’ve been considering printing some soft jaws for my vice and trying to tweak it a smidge more.
Definitely need to be careful doing this or the bed or heating elements can be damaged irreparably. Damaged heating elements are potentially dangerous.
