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Inconsistent Layer Lines...  

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TravQ3D
(@travq3d)
New Member
Inconsistent Layer Lines...

Relatively new MK3s+(~470 hrs) running firmware 3.9. I've been using mostly Prusament Galaxy Black or Silver PLA. Printer was pre-assembled; I have not done any manual tuning. Using PrusaSlicer and the built-in profiles - mostly the 0.15-Quality. As seen in both photos for the past few prints, I'm seeing inconsistent layer lines, some failed bridging, and minor stringing.

I can live with the little bit of stringing, but the layer lines do not meet quality standards. I'm hoping for suggestions on what I may need to calibrate/tune to get rid of this (mostly). I own several Ender's, so I'm very familiar with endless calibrations, I just need to be pointed in the right direction.

Extrusion Multiplier (flow)? Temp? Cooling? Belt Tension? Any help is appreciated!

NOTE: I noticed right before posting this that I did not have "Prusament PLA" selected as the filament profile (it was Generic PLA) for the prints seen in the photos. Would that make this much of a difference?

 

Posted : 01/09/2021 4:43 pm
Diem
 Diem
(@diem)
Illustrious Member

Would that make this much of a difference?

It will affect inter-layer adhesion and fine surface finish.

That said I think you may have two problems, your axes may not be running smoothly.

For both the X and Y axes:

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?)

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...

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.

Also, although this may be partially masked by the incorrect extrusion temperature, I suspect your filament is damp.  Look up threads on here about drying it.

Cheerio,

Posted : 01/09/2021 6:26 pm
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