Stringing problem  

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LocoMilo
(@locomilo)
New Member

Hello, it's my first time posting here. I seem to have a bit of a stringing problem. I've already checked the "retraction" settings and they are as recommended by prusa oficial website. I've tried lowering the extruder temperature to 195 ºC but it doesn't seem to make a difference. I've also tried using other brands of filament but doesn't change a thing either. Any suggestions on how to fix this?

3DPrinter model: Josef Prusa - i3 mk3
Filament type: PLA
Filament brand: PrintaLot - Grillon - and others
Printing Surface: smooth PEI sheet

Slicer: PrusaSlicer

Layerheight: 0.2mm
Perimiters: 2
Infill %: 15
Bottom/Top thickness: 5 / 7 layers
Print speed: 45mm/s perimeters - 80 mm/s infill - 180mm/s when moving.

Extrusion temp: 210 - 205 ºC 
Platform temp : 60 ºC

 

 

Posted : 24/07/2019 2:50 am
LocoMilo
(@locomilo)
New Member

I'll leave a screenshot of my retraction settings just in case

Posted : 24/07/2019 3:01 am
bobstro
(@bobstro)
Illustrious Member

The cause of fine stringing like that is hard to pinpoint exactly. Disabling z-hop (setting Printer Settings->Extruder 1->Retraction->Lift Z to 0) can help, but you might get top-surface scarring if your extrusion isn't well calibrated. It's all a balancing act. If the filament has absorbed moisture it will compound things. I wonder if simply high humidity can make a difference sometimes.

I spent a lot of time trying to pin-point this fine stringing, and have only come to the conclusion that small diagnostic prints rarely reflect the results you'll see with full-size prints. Do keep retraction distances below 2mm since we're using a direct-drive extruder. I use the following settings as a starting point. Stringing is much diminished although still present.

 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 24/07/2019 4:46 am
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