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Problems getting infills

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Hey guys,

i am having trouble with infill settings less than 60% (rectilinear).

While prints with 60% infill create a beautiful looking lattice, As soon as I go to 50%, though, it looks like the filament "curls up" instead of sticking to the layer below. All other parameters are the same.
Here is a collection of photos of both tries, you can easily tell which is which.

[www.dropbox.com]

Some data:
- 0.35 nozzle treated as 0.25 in firmware
- 70 mm/s infill speed
- PLA @185 C
- 0.1mm layer height, although I have seen it just the same with 0.2mm layers

Has someone else experienced this? And found a solution? I will be thankful for any hints, as low infills will really help me save time with my prints.
Thanks!

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