RE: MK4 x axis self test failure
Had the same issue, but for me it was one of the two bearings on the bottom slightly protruding to the right. pushing it in fixed it. (Assembly 3.29)
RE: MK4 x axis self test failure
Here is the cover remix. The cover is equipped with a hook that catches on one of the posts holding the Nextruder and prevents the cover from moving away from the Nextruder and hitting the X-axis holder: https://www.printables.com/model/545938-mk4-loveboard-cover/files
RE: MK4 x axis self test failure
It happened the same thing to me; I just put a new zip ties as the picture below... and that's it, now all axis test works fine.
RE: MK4 x axis self test failure
For months I had this issue. It turned out for me it was also a bearing protruding slightly.
Had the same issue, but for me it was one of the two bearings on the bottom slightly protruding to the right. pushing it in fixed it. (Assembly 3.29)
RE: MK4 x axis self test failure
I had an x-axis failure too. I was convinced it was that cover on the right side, but after taking it off and it continued to fail I had to hunt more. It turns out in my case it was the screw for the print fan hinge - it was sticking up a hair too far and it wasn't going all the way left.
RE: MK4 x axis self test failure
In my video guide (link in sig) I actually add a step to Prusa’s instructions whereby the bearing locations are double checked before sealing into place with a cover, and I also advise moving the carriage all the way to the left side immediately after installing the zip ties in order to ensure they do not touch the PSU cover at all - that way you know all is well and you will not have the X-axis error later on during first calibration. The videos add several of these ‘checks’ throughout the build, resulting in my initial calibration all passing first time, no issues at all…….
RE: MK4 x axis self test failure
I just assembled my MK4 kit and wasn't able to pass the self test due to x axis issues too. Saw some people said that the side cover of the Buddy assembly must be really snug - I looked at mine and I went to the manual and saw my cables seemed a little stiffer, I carefully adjusted and smoothed them out more, attached the side cover again. When putting the top cover back on, it really did seem to snap into place more - all self checks good after, printing now!
in all I would say when attaching the side cover, to really ensure it isn't attached and awkward. it should be snapped into place and add to a smooth silhouette of the right side of the printer.
RE: MK4 x axis self test failure
At my kit build, it was a bearing that was not flush with the housing.
It must have pressed out with the rubber during assembly.
Now all tests pass and the Mk4 is printing its ass off 🤣
RE: MK4 x axis self test failure
This was the best example why it fails in my case. Thank you 🙂
RE: MK4 x axis self test failure
I have the same issue. X axis calibrations fails and I found it was due to Love board right cover was in touch with trapezoidal nut / trapezoidal nut screw during the movement to the right. I tried to re-seat it but still no success. It mounted with only one screw on the right and cables pushing it a little bit out. I will try today using M3x10 low head screw on trapezoidal nut but I am not sure if it will help. Without the cover, test pass successfully.
I finally managed to solve x axis calibration failure. I redesigned love board cover right and now it passes x axis calibration without any issue. If anyone need it, I can share the design.
RE: MK4 x axis self test failure
I wouldn't mind checking it out, doesn't hurt to throw it on printables maybe you'll earn some points for it 🙂
Appreciate it
RE: MK4 x axis self test failure
My x-axis calibration failure was caused by the four screws in the bottom of the extruder carriage. They were too tight. I loosened them up a bit at a time until the self-test was successful. Note that I could print just fine as assembled.
RE: MK4 x axis self test failure
My x-axis calibration failure was caused by the four screws in the bottom of the extruder carriage. They were too tight. I loosened them up a bit at a time until the self-test was successful. Note that I could print just fine as assembled.
RE: MK4 x axis self test failure
My x-axis calibration failure was caused by the four screws in the bottom of the extruder carriage. They were too tight. I loosened them up a bit at a time until the self-test was successful. Note that I could print just fine as assembled.
Which might indicate the bearings are not seated correctly. I had an issue on the Y axis (the two on the left side) where the bearings would not run free until realigned into the housing. I'd check it out again.
RE: MK4 x axis self test failure
This post should be pinned.
"The X carriage should be able to travel to the left and right so far that none of the steel rods can be seen at the maximum left and right travel."
I think most users will find that there is something limiting the nextruder from reaching the limits of travel...
In my case it was the zip ties in back of the nextruder - the ones that hold the wire bundle...
RE: MK4 x axis self test failure
Having this error repeatedly on my self-assembled kit.
It's not the zip ties, they touch nothing at full movement range. Belt tension is per the belt tuning app. The pulley wheels seem to be as instructed.
Thought it might be the right side love board cover, rearranged the wires so that it definitely sits as flush as possible. It touches, but it's supposed to? Nothing of the rails is visible at either extreme.
In fact, as of my last few selftests, obstructions at either either end CAN'T be the problem. The extruder starts off approximately in the center, it grinds as it makes a lot of small left to right movements, then fails. It does not travel to the left or right ends.
RE: MK4 x axis self test failure
You can try to print my modified cover.
It solved x axis calibration issues for me once and forever.
The part is pretty simple and fast to print. Worth a try.
https://www.printables.com/model/596813-mk4-loveboard-cover-right-mod
Having this error repeatedly on my self-assembled kit.
It's not the zip ties, they touch nothing at full movement range. Belt tension is per the belt tuning app. The pulley wheels seem to be as instructed.
Thought it might be the right side love board cover, rearranged the wires so that it definitely sits as flush as possible. It touches, but it's supposed to? Nothing of the rails is visible at either extreme.
In fact, as of my last few selftests, obstructions at either either end CAN'T be the problem. The extruder starts off approximately in the center, it grinds as it makes a lot of small left to right movements, then fails. It does not travel to the left or right ends.
RE: MK4 x axis self test failure
After extensive troubleshooting, it turns out Firmware 5.0.0 will lead to X-axis test failure for no reason. Do hardware reset while USB drive is plugged in with Firmware 4.7.2 loaded on it, and X-axis test will pass!
RE: MK4 x axis self test failure
No reliable way to print a new one. And like I said, the self-test doesn't even encounter that theoretical obstruction before failing.
RE: MK4 x axis self test failure
Hi Gregory,
Would you mind share your re-design? I got the same problem, thanks in advance!