On 11/24/2018 at 9:40 PM, Smithy said:And is it spread among different printer types or can it be narrowed to a specific type?
I never had such an issue, that's why I am asking for.
Just a quick update to my findings on this issue:
I think I got it fixed now and what made the biggest difference was to set a small value (e.g. 1mm) for "max comb distance with no retract". These unretracted travel moves over printed parts were the cause for filament oozing away before each layer.
A suggestion to people experimenting with "equalize filament flow" and such: there's a new feature in marlin called "linear advance"... looks very promising although I haven't yet used it.
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Camaro 0
As kulfuerst mentioned, Extra Prime didn't solve this issue, but also led to blobs on other parts of the print.
Edited by CamaroI dried my filament and played with 'Equalize Filament Flow' but wasn't able to improve the issue. I will probably revisit this setting though later on.
As I had this problem with any slicer and a freind of mine has a similar setup I thought about what about my hardware is different from his: than it occured to me, that I'm running an 8-bit board with a 0.9° extruder motor on the E3D Titan and use 1/16 micro stepping on my extruder which led to about 800 steps per mm. I changed to 1/8 microstepping which massively improved quality. I guess the necessary step rate for driving the extruder on the retracts simply exceeded the one my board was possible to generate.
I'm not a 100% sure about this explaination, but reducing the microstepps worked for me. This also wouldn't explain why this problem didn't appear after each retract.
As a next step I want to exchange this board with an 32-bit one. After that I will try increasing the microstepps again and if I'm right the problem shouldn't reoccur.
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