Well you could use cura. You shouldn't have to adjust this parameter. It indicates you have some play/backlash or underextrusion. Are you using your UM2 for this? It doesn't look like underextrusion but it's hard to tell in the small photo. But backlash is rare on the UM2. Are your long belts and short belts all reasonably tight? Check all 6 belts! Count them. With power off push the head around - is one axis much more high resistance?
Backlash can be caused by either loose belts or by high resistance. In either case the head doesn't move as far as intended.
Or as I said it could be underextrusion. Maybe slicer is putting out an extra thick top layer to line the top up with the desired top of the part - so if the part is 10.05mm tall then the final layer may print .15 mm thick and this might be too fast (too much volume) for your printer and you might have to print slower on that layer.
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mutrax 5
Yeah, but how do you increase overlap for top infill in slic3r?
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