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I'm getting seemingly random lines scattered across the top surface of my prints:

lines1 lines2

Printer: Anycubic i3 mega
Slicer: Cura 3.2.1
Printer chosen in Cura: Prusa i3, Gcode flavor changed to RepRap
Cura Profile: Fine, "Outer before inner walls" enabled

What might be the reason?

1 Answer 1

Our local library has a genuine Prusa i3 Mk2.5 that recently had this problem. Because of the number of fingers engaging such a system, it was not immediately discovered that a different profile had been selected in which the Z-hop was turned off.

Z-hop is a feature in which the nozzle lifts slightly (and is height-adjustable) as it moves from one portion of the print to another.

According to my brief research, Cura supports z-hop in the settings. Either it has to be activated or perhaps slightly increased. The aforementioned Prusa works great with 0.5 mm lift.