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XT-CF20 settings help...

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Posted · XT-CF20 settings help...



I have a UM2+ with a Bondtech extruder (recently fitted) and a ruby nozzle.

I have been experimenting with ColorFabb XT-CF20 over the past few days. I have been struggling with getting my settings spot on...

I first used the average settings suggested by colorfabb (250degC, 65degC bed, 50% fan, 55mm/s print speed, plus other standard settings).

My first print created lots of stringing, so I designed a basic part to test for stringing and tried again...




To counteract this I tried reducing the temp to 240degC and increasing retraction length to 10mm. This definitely helped, but it still isn't perfect (especially at the top of the prints).


I have tried a number of prints varying print temp and retraction length to try and reduce the stringing. I still can't get a perfect result.

My second print is the best one, but there is still a very small string at the top of the print and looks like it might be starting to under extrude.




I am going to set off another print, but at a slower speed to see if that helps. Does anybody else have any further suggestions?





P.S. The nozzle also gets caked very easily. Any ideas? (hoping this is unrelated)





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