Odd first layer issue  

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dkim
 dkim
(@dkim)
Active Member

Weird issue: So I busted out my MK3S after a few month hiatus after printing face shields. So I redid the calibration wizard, re-greased the bearings and everything seemed fine. The 1st layer calibration worked well. So I print one of those pocket doc cams for zoom calls and it turns out pretty nicely on PETG. The second print, I'm getting these gaps in the first later. So I redo the 1st layer calibration and things are fine and again, I'm getting these gaps. Firmware is up to date, everything is calibrated (I think). Any thoughts? In addition to the gaps, sometimes (it's not consistent) the first layer gets another weird gap between the outline and the edge of the layer lines (shown in the second picture). Thoughts on what's going on? I don't think it's the Z height because the first part of the 1st layer looks great, then it slowly prints gaps...

This topic was modified 1 month ago by dkim
Posted : 15/09/2020 6:26 pm
dkim
 dkim
(@dkim)
Active Member
  • X Belt - 290
  • Y Belt - 277
  • Y Distance from Min: Left 14.12, Right 14.24
  • Point offset: X -1.15, Y 3.62
  • .08 measured skew
Posted : 15/09/2020 7:48 pm
Karl Herbert
(@karl-herbert)
Famed Member

@dkim

An irregular extrusion. Have you ever tried to clean hotend and nozzle? Possibly the filament transport is irregular or the spring tension of the drive gears is too loose.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 15/09/2020 8:07 pm
dkim
 dkim
(@dkim)
Active Member

@karl-herbert

I actually performed a cold pull after I finished printing the face shields. Not 100% sure about the spring tension of the drive gears. I'll try and tighten it up to see if it makes a difference. Thanks for your reply!

This post was modified 1 month ago by dkim
Posted : 15/09/2020 8:09 pm
dkim
 dkim
(@dkim)
Active Member

This is also the benchy 1st layer almost every time. This has to be some sort of layer shifting?

Posted : 15/09/2020 9:32 pm
Karl Herbert
(@karl-herbert)
Famed Member

@dkim

If you have problems with layershift you might find a solution here: https://help.prusa3d.com/en/article/layer-shifting_2020#prusa-mini

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 15/09/2020 10:23 pm
Karl Herbert
(@karl-herbert)
Famed Member

sorry, here is the link for the i3: https://help.prusa3d.com/en/article/layer-shifting_2020

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 15/09/2020 10:29 pm
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