I believe so, I have not altered print temp at all and it has printed fine before. When i heat up the nozzle and push filament through, it is nice and smooth.
How many print hours have you put on the printer since the last time you replace the PTFE coupler? It will deform over time due to friction and heat, and need to be replaced. The average lifespan of the coupler is about 500 print hours with PLA, fewer hours with high temp/abrasive materials.
Also, have you check your bowden tube for signs of damage? The printhead end should be cut flat. The feeder end should be widened out at 45 degrees. If the feeder end looks chewed up, you can try trimming a couple millimeters off and widening it out again. I have a photo here of a good feeder end and a bad feeder end for the bowden tube:
Also, if you remove both ends of the bowden tube from the printer (slide out the blue clip and press down on the white collet while you pull up on the bowden tube), try running a fresh piece of filament through the tube by hand. If you hit a point where it snags, there may be damage inside the tube.
If you have any ground up debris inside the tube or your feeder, you'll want to clean that out, because it could impede the progress of your filament. You can clean debris out of the tube by putting a little wad of paper towel in the tube and pushing it through with a piece of filament by hand. To clean the feeder, I'd remove the bowden tube and spray the feeder with canned air.
Looks like under extruderion.
Is your print temp high enough?
When you heat up the hotend and move the filament does it come out nice and smooth or is there little dots in it?
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