Estimated duration and number of layers are way off

[thehans]

I sliced an object using slic3r which is 35mm high, at a layer height of 0.2mm. It should have 175layers, but Pronterface says 1955 layers and a vastly exaggerated print time estimate.

I am guessing this is something to do with the fact that I use the "Lift Z on retract" setting in slic3r, and pronterface is just counting every Z movement as a layer? If that is the case, I think the best way to solve this would be to ignore layers that only contain travels, when counting layers.

My print is still in progress as I write this issue but it looks like the current estimate has dropped from 17 hours down to 2h30m

From the console window:
...
the print goes from 0.2 mm to 35.2 mm in Z
and is 35.0 mm high

Estimated duration (pessimistic): 1955 layers, 17:13:32