Qidi Tech 1 - Replicator 1 clone

[write2dgray]

I'm having a reoccurring issue that I could use a little help troubleshooting.

The print starts off fine and the first few layers look great, but at some point the infill gets all fubar like this (this is supposed to be 25% rectilinear):





It seems to occur only with a few rolls of PLA (not ABS or other filaments I've tried) and happens on both extruders over a range of temps. It's often accompanied by the clicking sound I hear when the filament is not feeding freely, but the feed path is clear without tension.

What do you think might be the issue or do you have any suggestions I might try?

Thanks!