Edit: it is fixed!
History: Correcting leaning prints
The ultimaker 2+ is my first 3d printer. A month ago the prints began to lean to the left as a print gained height. I corrected this issue using some helpful guides on the forums, as it turned out to b e an issue with the horizontal belt motor. It needed to be tightened, as there was a big gap in a part. I tightened it and reassembled everything. I successfully printed an ultimaker robot, and the print did not lean at all.
Gaps In Prints
Since the successful robot print after my leaning print correction, all of my prints have had gaps between the filament path, where it should be laying flush. This is printing with the same file, materials, and settings that I was having success with previously. Here is a video showing the issue. It's most visible at 0:46. Look at the brim in the center, running vertical, and the brim on the right side, running verticle. The filament has gaps between each pass.
https://www.youtube.com/watch?v=qDN13XFh2SA
I have tried:
Aligning the Print Bed
Removing the Material
Watching the reinserted material extrude a nice thick line onto the build plate for 30 seconds.
Increasing the print temperature on colorfab PLA from 210 to 215 C
Performed the atomic method of unclogging the nozzle. I got a clean pull. Print still has gaps in layers.
Is it possible that I have caused an issue by messing with the horizontal belt motor? Or is this a clogged nozzle? (it extruded a beautiful line of filament after the new material was inserted, so I'm not sure.) Any recommendations appreciated.