Hi guys, need help on this problem..printing PLA at 195,

Maxime_Gagne · March 17, 2015, 1:43am

Hi guys, need help on this problem…printing PLA at 195, 0.4mm nozzle 1.75mm all metal E3D. 0.4mm first layer height.

Am I over extruding? Bad z leveling? Or is this cause by the software?

This was with slic3r.

Mateusz_Perlak · March 17, 2015, 2:03am

Seems like too low on z leveling. add 0.1-0.2 in slic3r and see how it works.

ThantiK · March 17, 2015, 2:07am

You’re overextruding slightly too. Notice how the filament piles up on the edges where it changes direction. That shouldn’t pile up a lot.

Mateusz_Perlak · March 17, 2015, 2:12am

Slic3r got default 200% extrusion width for the first layer, isn’t that ‘wanted’ over extrusion?

Maxime_Gagne · March 17, 2015, 2:23am

Higher and it dosen’t stick on bed, that 200% is interresting, will try to lower it and see if it goes better, thank you

ThantiK · March 17, 2015, 3:08am

@Mateusz_Perlak , it’s not over extrusion for the first layer. The line widths are accounted for so that it’s not over extruding.

Mateusz_Perlak · March 17, 2015, 3:10am

Thanks, so that means it will space the lines 2x more between them, not adding extra plastic?

ThantiK · March 17, 2015, 3:35am

@Mateusz_Perlak , yes, it spaces the lines apart appropriately, IIRC

Stephanie_A · March 17, 2015, 4:09am

Your layer height must be less than your nozzle diameter. I think the max is 80% of nozzle diameter. If its more, the extrusion doesn’t get squished down enough and maintains a circular cross section. It also men’s less bed adhesion and its path becomes unpredictable.

Enrico_Colautti · March 17, 2015, 9:08am

I had a similar problem. I changed the first layer parameters: layer height = size of the nozzle, in my case 0.4mm and set the width extrusion to 200%. Everything works great

Maxime_Gagne · March 17, 2015, 12:05pm

@Enrico_Colautti This is actually my exact setup.

Stephanie_A · March 17, 2015, 12:18pm

Again, layer height must always be less than nozzle diameter. http://hydraraptor.blogspot.com/2011/03/spot-on-flow-rate.html
The extrusion is unpredictable if it is same or higher. @nop_head has great examples of filament shape and path on his blog. Because your layer height = nozzle diameter, the extrusion is not flattened down, and it doesn’t form a predictable shape or path.

Maxime_Gagne · March 17, 2015, 12:21pm

@Stephanie_A Will test that too tonight even if i’m less optimistic.

ThantiK · March 17, 2015, 12:38pm

@Stephanie_A is right. To get proper adhesion, your layer height should be <80% of your nozzle width. There are those who will claim that’s not true, but the result of anything over that is sub-par.