what is causing this problem with filament gaps

This just started happening, and I'm not sure why. My E steps were calibrated 2 days ago. I thought the hotend might be clogged, and I used the metal flow to see if that was the case. No real clog issue were present. The bed was just re-leveled before this print. I don't even know where to begin on this one. What could be the issue?

from my little experience this is a bad filament or your extruder is losing steps..! try and measure with a caliper the diameter of ur filament.

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Delta Printer
Duet 0.8.5 firmware 1.19

Thanks for the response. I got it working again. I measured the filament over a 30 foot stretch. so I think we are good there. I was printing at .5mm extrusion width with a .4mm nozzle. I had the extrusion multiplier set for .5mm. I fixed that problem and reset the extrusion multiplier. I then opened the extruder to see if any plastic was caught in the teeth. It was fin. I retightened the springs. The print is now holding.