Based on my experiences with PLA, there are 2 main issues.
The first and simple is the feeder tube. PLA causes a higher friction than ABS. My recommendation is to change the feeder tube to PTFE to reduce the friction.
The next thing is, that the hot end is not designed to work with PLA. Because of the higher friction of PLA the filament stick in the last 10mm of the hot end (the original PTFE tube is not going down to the noozle). ItÂ´s not a typical clog of the noozle.
I built my own hot end where the PTFE tube goes from the extruder direct to the noozle and meet it in the alu block. To avoid conducting the heat up to the extruder, itÂ´s necessary to reduce the diameter between the alu block and the feeder housing, and I build a heat sink ring. The problem is, PTFE does not like temperatures above 250Â°C, so I have to change my hotend before printing HIPS, ABS and so on.
With this mod I printed kilos of PLA from different sources so far without any failed print. Also raft removal after printing is so easy.
To be fair, I was inspired by the Hotend Mod from Julia Truchsess