Testing ceramics hot end segment to avoid usage of ptfe tubes inside of heat sink above heater. Unfortunately it turned out that even at low 185ºC extrusion temperatures pla tends to stick to it for some reason, like it enjoys the contact with ceramics. It managed to work a bit but not very reliable, tested with 1.75 and 3 mm PLA filaments.
Big thanks goes to mr. Ivan Gloc from 3dforum.com.hr for providing this interesting part. This was short lived experiment since there was no time to loose. My best guess is there is very high resistance when two materials meet as opposed to slick ptfe. Next up are slider modifications and upgrade on v1.8.