The Original Prusa i3 MK3 is the successor of the award-winning Original Prusa i3 MK2 3D printer.

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Auto Home - X Axis Not Fully Home

Short Version:

My x-axis is not moving all the way to the left when I select auto home. It also is not moving all the way to the left when I run the XYZ calibration.

Long Version:

I finished assembling my printer last night and my first print after calibration came unstuck from the bed. I determined that the issue was probably that my z axis calibration was set too far away from the build plate. I re-ran the z-axis calibration, but since the value I ended up with had a magnitude greater than -1 mm, I adjusted the PINDA probe to move it up, as the manual recommends. I re-ran the Z-calibration, again as the manual recommends, and was able to get it to a reasonable value.

When I went to re-run my first test print, it was having problems adhering, and eventually displayed crash detected. Not wanting to break the printer, I quickly hit the reset button on the control panel, and used the settings to move the z-axis up and cancelled the print that was in progress.

Now, whenever I try to perform an xyz calibration, it isn't going all the way to the corner. I didn't think that would be a big problem, and continued with the calibration, but it leads to the circles performed during the z-axis calibration to be off-centered from the calibration points, which leads to the nozzle hitting my paper, which leads to me canceling the calibration.

Question: I THINK my problem is with the X-axis not homing correctly. How does one go about fixing that on a printer without end stops?

Answered! View the answer I have this problem too

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Additional information: I ran a self-test to see if starting from scratch would fix the problem, and it fails at the X-axis, saying that my X-axis length is too short.


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2 Answers

Chosen Solution

I did some more digging around the answers on here once I got the "Failed Length" issue, and found this: Initial self-test fails: Error check X-Axis Length

Following their suggestions, I loosened the bolts holding the back plate on to the extruder assembly, and this made the movements on the x-axis much easier. It now passes that check in the self test and is moving fully to the left in the auto home procedure.

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That did not fix it for me.


Hey Ed.

Usually those problems are caused by improper X axis assembly, most often because the extruder wire is exposed near the backplate. Please re-visit the manual and make sure everything is assembled properly.


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Hey there! I’m not from the Prusa Support team but may be able to help.

Like mentioned above, it’s always good to see if the belt is too tight or too loose. However, another thing that may help is to see if the cable bundle from the extruder is bumping into the frame. Something like this may cause the PINDA to not quite reach the calibration point needed.

I hope this helps, and good luck!


NOTE: I see this has already been self-answered but it may be helpful to others like @edzatool .

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Davin Hould will be eternally grateful.
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