I'm getting a very weird effect on a particular print where the top section of the part does not have a solid wall, but the part is comprised of diagonal lines going one direction on one side and the other direction on the other side. The result is that this section is very weak. I've printed twice and the two prints look very similar. The part is solid up until a few parts protrude, and at that point it transitions to this pattern without a solid wall. The conductive composite PLA from Protopasta, but I've printed a very similar part successfully with the same filament in the past. Any tips or troubleshooting recommendations would be welcome. Thanks!