Draft nozzle dripping
My single filament Robox print head is having some issues: whenever fine nozzle is used (print quality 'normal' or 'fine', first layers of 'draft' print) there is a slight drip from the draft nozzle that deposits on top of existing layers and forming blobs. It is causing future problems - layers are not smooth due to bits of a filament sticking in random places.
Slowing down the printing and changing the temperature won't fix the issue. My suspicions are:
1. heat block seal is failing,
2. draft nozzle needle malfunctioning.
I can't finish the nozzle opening calibration due to material coming though the draft nozzle.
I've disconnected the printer head and found out traces of decomposing filament in the secondary feed, deep in the inlet nozzle. That makes me thinking the previous user must have feed the printer using 2nd slot and possibly had an issue with snapped or jammed filament (hence traces of red filament I've never used in 2nd entry path at the back of the printer head).
Can you advise if manual purge instructions would fix the issue? ( removed link )
I know it's recommended for single filament printers only.
Is the malfunction caused by particles of decomposing filament preventing the draft needle form closing down completely?
Thanks a lot for your answer and explanation why the second material feed is blocked off.
I'll try to open a support ticket but the machine and the print head warranties expired some time ago.
I've been trying automatic purge and nozzle cleaning procedures multiple times with no effect, so it's possibly the time to save up and buy a new print head.
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