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I made some black ABS filament using some masterbatch from CraigRK. It came out really well and I am happy with the prints I have from it. Both on my Mendel90 and gunbot:
One thing I have noticed is that the filament quality from the filastruder is better when the temperature is lower. However, with a low extrusion temp. the die swell is so much with the standard 3mm nozzle that I was getting filament of 3.2mm in diameter. This proved a problem for gunbot.
Due to the metal shards I was getting in the filament (which has cleared now BTW. See the comments in the link) I ordered a nozzle with inbuilt filter.
Quite by accident, they sent me a 1.75mm nozzle instead of the 3mm one I ordered. They said I could easily fix this by drilling out the hole to 2.7mm, as is drilled for the standard 3mm nozzle. I decided to start small, and started with 2.5mm.
Extruding at 185C with this nozzle gave excellent results. 3mm bang on and super smooth filament with the plastic pellets from CraigRK.
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