Y-Axis calibration is failing after several good prints
Hello,
I upgraded my MK4 to MK4S. It worked fine for several prints, however, the last few prints fails due to shifts of the y-axis. Therefore, I did a new calibration, however, it fails now. I checked the tension of the belt and it was to tight. Therefore, I decreased the tension. Now, it is fine. However, the calibration of the Y-Axis still fails. Any ideas?
Best regards
RE: Y-Axis calibration is failing after several good prints
Please search the forum. There are lots of threads similar to this, although usually new builds. Maybe something got out of position or installed incorrectly when you changed the belt tensioners. I'd start going over your install, then of you can't find anything most y axis calibration fails are because of the bearings being or 3 of position.
RE: Y-Axis calibration is failing after several good prints
I would start with the two bearing on the left side under the hot bed. I would guess that going back and forth they may have gotten knocked inward a little. Those bearing have to be in perfect placement. And TBH, there isn't a clear show of what is perfect in the manuals. I used a paper clip, put the end of the paperclip in the lip of the outside inset of the bearing and pushed the bearing up to the bracket. After I did that, my y-axis would pass... hard to describe without a picture.
I was kind of nervous about them getting knocked out of spec because bearing smack the rod brackets sometimes. Especially since the bearings aren't that tight or it bind up.. not terribly happy with precision of that part.
Hope this help you some.
RE: Y-Axis calibration is failing after several good prints
Happy new year.
I finally had time to check the Y axis again.
I checked the bearings. I've ensured that the two bearings are positioned as near as possible to the center without touching the edges and that the singe bearing is centered, as described in the assembly guide for the MK4S. (I only upgraded my MK4 to MK4S)
I checked the tension of the belt several times using the belt tuner. The calibration still fails.
In the rear position the rear bearing does not touch anything. However, the front bearing touches the rod holder in the front position.
RE: Y-Axis calibration is failing after several good prints
is the y axis
belt tensioner, the correct way round?
regards Joan
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: Y-Axis calibration is failing after several good prints
Yes, it is.
As I mentioned before, it worked for several prints. I did the calibration after the upgrade and it was successful. After 2 or 3 days of printing, it started printing with a incorrect Y axis. Therefore, I did the calibration again and it fails everytime now.
RE: Y-Axis calibration is failing after several good prints
Any ideas what else I can check?
The calibration fails when it is moved to the front.
RE: Y-Axis calibration is failing after several good prints
pulling at straws here but did you check the rod holder's screws? I my mk4s (and the mk4 before the upgrade) all screws would shake themselves loose by at least a quarter turn after a couple of weeks printing.
I now regularly go through all and retighten...