Feature to resume a print
I do a lot of printing with ESD PLA, which is more brittle than standard PLA. It occasionally snaps off during a print just before the head without detection, and the print head continues waving merrily about in the air until I stop the print. Manually editing the gcode to pick up from where it was left off is very tricky. Prusa should add a resume feature allowing one to rewind from the end of a file through the layers (not the X and Y travels; just the Z) to the desired starting point.
If this is the semi-conductive filament with C nanotubes then it is VERY sensitive to humidity. As it absorbs moisture the nanotubes don't swell with the filament and it micro-cracks.
This is another filament where drying and maintaining dryness is important.
Cheerio,