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MK3S calibrates several times in the middle of prints.  

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MHLAV
(@mhlav)
New Member
MK3S calibrates several times in the middle of prints.

I have noticed that my MK3S randomly calibrates itself back to auto-home in the middle of the print. Sometimes it does it several times in just a few minutes. It goes back to printing normally shortly afterward, but I was just wondering why it does that, if that is a sign of some problems with the printer, and what I can do to fix it (if it is, in fact, a problem).

Posted : 06/08/2021 5:54 pm
Diem
 Diem
(@diem)
Noble Member

What does the crash report (in the LCD menu) say?

Cheerio,

Posted : 06/08/2021 6:34 pm
Peter M
(@peter-m)
Noble Member

If printer hits something (or thinks the printer does) , the printer moves away and tries to start again.

On screen you should see it, and there is a counter inside the printer.

Look if printer is hitting model, clean rods, and put thin oil on rods, maintenance you need to do every few rolls of filament.

Make a movie could help the forum.

 

Posted : 06/08/2021 8:21 pm
MHLAV
(@mhlav)
New Member
Topic starter answered:
my last print had 20 Y-axis crashes.

thanks

Posted : 06/08/2021 9:05 pm
Diem
 Diem
(@diem)
Noble Member

OK, so the issue is with the Y axis:

First, with the power off, move the axis by hand; is is smooth? Does the resistance stay the same over the whole range?

Clean and lubricate the smooth rods, check they are not damaged/scratched. Check the idler pulley is not clogged, out of line, or damaged (loosen the belt and try turning it with your fingertip, is it smooth?)

If this is a new build check you have mounted the Y axis bearings correcty, step 20 onwards on https://help.prusa3d.com/en/guide/2-y-axis-assembly_165795

With the belt loose try turning the stepper motor by hand; is is smooth?

Retighten the belt until it just begins to make a low musical note when plucked...

If the printer works, make your next print this:

https://www.prusaprinters.org/prints/46639-tension-meter-for-the-gt2-belts-of-i3-mk3s-or-prus

It MUST be printed in Prusament PETG or the spring tension will be wrong.

Let us know how you get on.

Cheerio,

Posted : 06/08/2021 9:49 pm
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