Hello,
I was too fast tell how much I like K8600. 
After total 10-15 succesfull prints problem occured today on todays second print.
Extruder fan stopped during printing and resulted feed problems. Fan is totally dead - cables are ok. The other fan is very noisy too, maybe out of balance? At least I need one replacement fan. How to clean extruder well if problems with feed?
Rgs, Kalle Rahkasuo
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