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PET+ Trouble with infill

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I just started printing with PET+. I printed a bunch of twin test cylinders to find the optimal print temperature. At 220C the surface finish is perfect and layer bonding is very strong. So I started printing some larger objects. The bottom layers and outer walls print perfectly but as soon as the infill starts the lines break down and the infill ends up a mess. It looks as though not enough material is being extruded during the infill. I tried slowing the infill speed to the same as the print speed (30 mm/s) with no luck. I also tried increasing the print temp to 230C thinking the material wasn't flowing fast enough, but that didn't help. Could this be a retraction issue? The retraction settings on my UM2 are 4.5mm @ 25 mm/s. The Cura retraction settings are 1.5 mm minimum travel, combing off, 0.02 minimal extrusion, and 0 Z hop.

Here is a pitcure with a few infill layers printed after the bottom layers.

20150710_081529.thumb.jpg.e87c7b21b064ccd66ebf4a95645d0a84.jpg

20150710_081529.thumb.jpg.e87c7b21b064ccd66ebf4a95645d0a84.jpg

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OK, looks like I fixed the problem myself. I reduced the retraction length to 3 mm as recommended by MadeSolid. I really didn't expect 1.5 mm to make that much of a difference but I guess it does. I also decreased my infill from 20 to 15%. The infill is still a little messy, but at least it is complete.

20150713_100741.thumb.jpg.56559b643c07b5e4d5a586358357037e.jpg

20150713_100741.thumb.jpg.56559b643c07b5e4d5a586358357037e.jpg

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Sorry for the late reply, I was expecting an email notification when I received a response. Anyway, you were both correct. I was printing at too low a temperature. I was misled by the PET+ printing temp specs listed as 220-250. I should have checked the MadeSolid printer settings first. Thank you1

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