I received a roll of Black filament as a present, and struggled to print with it, experiencing extreme under-extrusion (and slippage of the hobbed gear). Higher temperatures seemed to work better, particularly in freeing up the extrude rate.
The filament is advertised as PLA, but without any temperature recommendations that I can find on the vendor's website (or the amazon listing). Amazon reviews have a fairly wide range of temperatures, but the listing aggregates several colours. There is a suggestion that the filament may be PETG, or ABS.
I have tried using acetone, and it dissolves roughly the same as some ABS I have, my PLA shows some weakening but doesn't dissolve.
Below about 215°C, extrusion is borderline non-existent. I printed at 225°C with a fan, and it extruded kind of OK, but adhesion was poor. 240° without a fan seems a bit on the hot side (see photo). Even 255°C seems to extrude OK without burning. There is no smell I can observe (but I have a cold). It burns with a small blue flame, and minimal smell (kind of like natural gas).
One factor against it being ABS is that with the bed at 60°C, printing both a benchy and the heat tower below, there was no warping. Bed adhesion remained good.
Is there anything I can do to better identify this filament and decide the best combination of fan/temperature without wasting too much time?