so a couple things ive seen only lately.
If your nozzle is too close to the bed, it will eat the filament. it cant push the filament out so it back pressures... seen this a few times while working on bed leveling.
Also... the type of filament matters a lot.
for instance, clear PLA from MIcrocenter eats and jams like crazy. BUT hatchbox pla does not.
Now ive heard sometimes that clear PLA needs 225-230 temps, which i could test and should... but at least a couple things to check