Ultimaker 2 Extruder problems - needed upgrade

[remiol 0]

GR5 - thank you for your detailed repsonse! It will help me and other people for sure.

 

I already received bondtech - print quality is now awesome! I am only disappointed (maybe I shouldnt) that I can not print 80mm/s on 0,4nozzle and 0,3 layer height - some under extrusion still visible on temp 220°C (PLA Colorfill). It is normal or should I trying to find the issue? 

 

When I was connecting the feeder I saw that my motherboard is brown in few places, I think its from step sticks, it is normal? Below photo.

[tinkergnome 927]

7 hours ago, remiol said:

some under extrusion still visible on temp 220°C (PLA Colorfill)

 

The popular speed test from back in the days used 230C for PLA, it's maybe worth a try:

 

 

7 hours ago, remiol said:

I saw that my motherboard is brown in few places

 

The discoloration is normal, i think all boards look like this after some time.