I just tried to print using Cura a 20x20x10mm cube (res 0.2mm, no infill, 2 shells, 4 bottom, no top layers) layers with “Pause_At_Layer = 7,12” command. The command executes Pause at layer 7 but as the head lifts, there is a dump of filament (if you look closer where the tail starts you notice a circular dump pattern) with about 10mm upward tail following the dump. An Oh-Oh error also comes up but it is not fatal.
When the Start command is hit in the dashboard to continue printing, the head makes 1 full turn at the high level it stopped after the pause, then comes down but there is no more filament extursion. In my case it continues like that (no extrusion) to layer 12 for the second pause and the second dump.
You see 2 tails one on top each other without layers 8 to 11 in between. I stopped the print at layer 12.
What I don’t understand is, if it is not extruding after the first Pause, how it is doing the 2nd dump at the 2nd Pause!
Update: I did another run with one Pause at layer 10 but continued printing passed that layer. It took the printer 5 or 6 layers before filament started to extrude. In short, I think there is a not enough retract and also compensate for retract issue …