Scratching and dribbles
Anyone got any suggestions on how to resolve this? My first layer always has these dribbles and top layers always have a bit of scratching as the print head catches the lower layer. I don't have stringing problems though. I've dialled in the retraction etc pretty well I thought. I'm using Cura 5.0 and have used previous Cura's. I'd rather use Cura as I use it for my other printers too.
Best Answer by Diem:
No single obvious problem.
Your first layer 'Z' calibration could usefully be tweaked a little to reduce the layer lines.
Take a close look at your heater block, it's not clear in the pictures but there are signs that molten filament *might* be running down from above.
You have recently had issues with damp filament and there are hints that this might be the case with the print pictured - you may have masked this with excessive retraction, try drying your filament instead.
... and how did that filament scrap get fused to the bottom of the extruder body..?
I suggest you bring your next regular maintenance session forward and check through carefully. There seem to be a bunch of minor issues compounding rather than one big problem.
https://help.prusa3d.com/en/article/i3-printers-regular-maintenance_2072
Cheerio,
Please show us the underside of that print; I suspect warping and incomplete adhesion. Also show us your hotend/nozzle assembly from two different angles.
Cheerio,
RE: Scratching and dribbles
Hi,
I really appreciate your response. I have no problems with adhesion and warping. This PEI is great. Am I missing a screw from the underside?
Thanks!
RE: Scratching and dribbles
From the looks of your first pic, your Z height needs to be lowered.
Your print sheet also needs to be squeaky clean to prevent warping.
Cheers
RE: Scratching and dribbles
Thanks, yes a touch maybe though i have zero problems with warping or adhesion. Scratched top layers and dribbles are the issues.
No single obvious problem.
Your first layer 'Z' calibration could usefully be tweaked a little to reduce the layer lines.
Take a close look at your heater block, it's not clear in the pictures but there are signs that molten filament *might* be running down from above.
You have recently had issues with damp filament and there are hints that this might be the case with the print pictured - you may have masked this with excessive retraction, try drying your filament instead.
... and how did that filament scrap get fused to the bottom of the extruder body..?
I suggest you bring your next regular maintenance session forward and check through carefully. There seem to be a bunch of minor issues compounding rather than one big problem.
https://help.prusa3d.com/en/article/i3-printers-regular-maintenance_2072
Cheerio,
RE: Scratching and dribbles
As suggested above, bring the Z level down.
I pretty pretty much exclusively in PLA, and when I look at the bottom of a print it is generally completely smooth with the lines hardly being visible at all.....
--> MK4 - MK4S - MINI+ - MMU3 - Accelerometer Guide - BambuLab A1 Combo <--
RE: Scratching and dribbles
Thanks for all your help folks. As it turned out I switched to the latest prusa slicer and all was fine. I did notice that the prusa default includes z-hop which I usually turn off so that would help with scratches anyway. Not sure about the dribble but it's gone now anyway.