Notifications
Clear all

Scratching and dribbles  

  RSS
AuthentiKit
(@authentikit)
Active Member
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,

Posted : 08/02/2023 3:25 pm
Diem
 Diem
(@diem)
Illustrious Member

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,

Posted : 08/02/2023 4:21 pm
AuthentiKit
(@authentikit)
Active Member
Topic starter answered:
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!

Posted : 09/02/2023 9:19 pm
RandyM9
(@randym9)
Honorable Member
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

Posted : 10/02/2023 5:29 am
AuthentiKit
(@authentikit)
Active Member
Topic starter answered:
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.

Posted : 10/02/2023 7:48 am
Diem
 Diem
(@diem)
Illustrious Member

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,

Posted : 10/02/2023 8:04 am
iftibashir
(@iftibashir)
Honorable Member
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.....

ORIGINAL PRUSA MK4 KIT - Full step-by-step video assembly guide!

>ORIGINAL PRUSA MINI+ Full video assembly guide!

Posted : 10/02/2023 9:18 am
AuthentiKit
(@authentikit)
Active Member
Topic starter answered:
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.

Posted : 15/02/2023 6:54 pm
Share: