Having used my Ultimaker 2+ purchased form you in December quite successfully for many weeks, I had a major problem develop with it during a print yesterday. I left the machine running for a few hours and came back to it to find this.
The first photo shows the hot end after I partially disassembled it quickly to avoid it all sticking together with hot PLA.
The PLA has leaked above the Olsson block and formed a large block of PLA around the Olsson heating element and the temperature sensor.
By heating the block carefully after disassembly I have managed to free the PLA block and isolate all the components.
I am not sure how this could have happened other than perhaps a mis-manufactured Olsson block causing a leak to due the flat plane onto which the nozzle sits not being perfect.
The 0.4mm nozzle in use had been in use for several weeks with no problems and daily prints. The nozzle was tight and checked while cold after being inserted and tightened whilst the block was still hot. The PLA definitely leaked out above the Olsson block. The metal feed collar and the PTFE feed collar are in good undamaged condition. However the metal collar has solidified PLA around its threads.
The PLA is Innofil blue purchased from your company and not previously caused any problems. Never had any leaks before!
The issue i have now is that the heating element and temperature sensor have hardened PLA on them. The Olsson block, although I have tried to clean it off, is coated in a layer of PLA and therefore I cannot re-use it as it will burn onto the block. All fans and the other hot end components are fine.
Can anyone suggest how to rectify the problem of the PLA coating components? I think I will need a new wiring loom back to the mother board due to the PLA on the heater and sensor, a new Olsson block and a new metal feed collar to screw into the Olsson block. Also probably a new nozzle due to bad burn in of the nozzle after the leak encased it.