UM1 aluminium block not transferring heat to nozzle

gvg · February 27, 2015

I'm having some issues with my Ultimaker Original recently. The last thing was that I've broken the nozzle throat (Hot end isolator tube). After that I disassembly the entire hot end, took the screw that was stuck on the peek and put a new one. Changed that nozzle, the heat block and also the teflon isolator (hot end isolator coupler), it was with an oval shape already. The replacement for the hot end isolator coupler had an OD smaller than the original, so it didn't fit tight in the peek.

Hot end assembled and to my surprise the filament was getting clogged every time, so I took the time to check the temperature and found that the temperature on the heat block was displaying the right temp (~220C) but on the nozzle was way lower (like 50C).

Have anyone had this kind of issue? Is this the reason my nozzle get clogged and stops printing?

temp check

teflon isolator

Dim3nsioneer · February 28, 2015

You certainly have different epsilons on nozzle and heater block. And none of them is 0.96 as you've set it on the camera. So the values you get might be quite far off the truth. Or did you paint everything with a pencil or similar? Only then you would get correct readings.

You screwed a clean nozzle into a clean heater block, didn't you? If you have some filament on the thread of either one this might influence the heat transfer.