For weeks my first roll of Polymaker PC Plus, 2.85 worked beautifully.
It’s kept in air tight container with ample indicator desiccant that remains yellow… Feeds through teflon tube from container to enclosure… from extruder it is smooth (no bubbles).
Second roll same setup. Moved from packaging to desiccant box and stored there about 48hrs. Nothing but bubbly extrusion now.
Ordered roll of newer Polymer PolyLite PC Filament (Formerly PC-Plus)
Possible that second roll is just too old to be usable??