this post was submitted on 27 Nov 2023
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14
Constantly Adjusting Z Height Offset (self.3dprinting)
submitted 1 year ago by OZFive to c/3dprinting
9 comments fedilink hide all child comments
 

Good day! I am running a Klipperized Sovol SV06+ and have been getting some really great prints. I am however having an issue where lately I am having to adjust the Z offset with each new print. I did a first layer calibration and got a perfect result but after a couple prints I saw I needed to lower it to get a good first layer. Again I printed a few and then again I needed to lower it. This has happened a few times.

Yesterday I was printing a pretty large print and midway through the extruder shifted (the print remained secure to the bed) and continued printing. After I canceled the print I had to lower the Z offset much further than I thought was possible. I am concerned that the bed keeps "lowering".

I have a very good bed mesh loaded (used the silicone bed leveling mid I have seen discussed). I am just unsure why this is needing to be adjusted and why the last print went wonky (related?)

Thanks much!

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[–] Brainsploosh 4 points 1 year ago (1 children)

I have no experience with your particular printer, but I've had an issue where the bed was very sensitive due to being the edge of the adjustment range.

The bed screws on the Ultimaker 2 are manual screws with springs, and you can level the bed throughout most of the screw length. Having it at one end means the spring is quite loose, and things like weight and nozzle pressure affected the flatness of the bed.

So if you have an elastic tensioner for your bed, maybe set it at higher tension for a more robust flatness?

If you're always adjusting in the same direction though, it's not that, and is probably a software error where something doesn't count Z-position right. Unless of course your printer is somehow getting longer?

[–] OZFive 2 points 1 year ago

The printer bed is non adjustable. It relies solely on auto bed leveling. I did a silicone base mod to actually adjust the bed and level it manually in addition to the abl. That is why I had such a great mesh loaded.

[–] [email protected] 3 points 1 year ago (2 children)

How is the z position determined? Is it with the probe or a fixed endstop? Check that there's no play in those parts.

[–] OZFive 1 points 1 year ago

Probe, will check!

[–] OZFive 1 points 1 year ago

No play. The probe is secure and didn't move at all.

[–] [email protected] 2 points 1 year ago (1 children)

What type of material are you printing? Could be the material is eating away at the brass nozzle causing you to need to adjust the z offset.

[–] OZFive 1 points 1 year ago (1 children)

Overture PLA

[–] [email protected] 1 points 1 year ago (1 children)

Shouldnt be the filament then. I would make sure the probe is fully secured like the other comment suggested. Good luck, that sounds frustrating! I need to adjust mine, but usually after printing for a couple weeks.

[–] OZFive 1 points 1 year ago

It is secure. Not a wiggle or jiggle to it.