Yes I'm familiar with the "dragging across lower line and snapping". I've seen it many times. Cura tends to make infill at like 2X printing speed so I'd try even slower - 20% - just to see what happens. Also you want the fan as low as possible but still turning.
Check your infill line width! I didn't think of that - but cura can do some really stupid things like setting that to a different value than the rest of the print. Make sure it is the same as your normal line width. Or wider.
It could just be a bad brand of filament?
Different types of plastics have different characteristics. PVA breaks like this very easily but PLA sticks to itself better (like a liquid rubber band) and doesn't snap easily. PETG is somewhere in between. Maybe your formulation isn't so good.
Anyway, using the front panel on your printer, I would consider increasing the temp by 5C, slowing to 20 or 30% lowering fan, increasing flow by 20%. If any of these work then you can put these into cura. Infill speed can be set differently than other printing speeds. In cura you wouldn't increase the infill "flow" (because that's not a setting) but you can achieve the exact same result by increasing the infill line width.
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gr5 2,224
I've seen this before with PLA. It usually happens when I print too fast. It can sometimes be improved by over extruding but mostly it's fixed by slowing down. Try printing the infill at 1/2 or even 1/4 speed you are printing now and see if that helps. I haven't had this problem with PETG but maybe I print too slow to see this.
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mechman29 0
Thanks for the reply!
I just did this same test with it going at 60% speed. Same result. It's actually dragging across the previously laid line and colliding with it and snapping it. I don't understand what's going on. I have watched videos of people printing fast and not having issues.
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