Moved to Pla from Abs. Benchy has some problems. Left most is with 45mm/s extrusion rate, 200°c and no significant part cooling other than a ceiling fan. Fully printed Benchy is with 60mm/s rate. How to remove the bulges? Please suggest. Thanks
Looks like overextrusion and maybe not enough retraction. You may be running too hot, too, so turn on your cooling fan. Start with 50%…
@Tim_Sailer Thanks for the reply. 50% of what, please ? By the way my calibration cube came out awesome. Will post picture.
50% fan.
with PLA, you absolutely need part cooling.
This is definitely overextrusion. You can see on the little minion print that you’re getting filament pileup on the edges of the borders. I’d check the diameter of your filament, make sure it’s 1.6, 1.7, 1.8 or whatever - and correctly enter that into your slicer. If that doesn’t help, dial back the extrusion multiplier down to 90% and reprint. What’s happening is that your filament is squishing out the sides and pushing past the natural border of your part.
@ThantiK Thank you so much. I will definitely check it out today.
Since you are coming from ABS, maybe I can help cause I had all the same problems 
First, you need fans, it’s a must with PLA.
Next, the extrusion is too fast. Your printer maybe calibrated but PLA is much easier to extrude, so change the speed on the firmware.
Last but not list, you need to make a termal calibration. Download some C shapes on Thingverse and follow the instructions.
This steps should pit you on track.
@Kamesh_M_Sundaram These are the thermal calibration clips to eliminate under or over extrusion that @Andre_Frazatto was mentioning.
@Jeff_Parish Yes. I will do it today