ealexander456

"So PTFE starts to decompose slowly at 200C, hyperbolically so around 230...." Since most, if not all, of the filament materials that we as 3D printer owners have melting temperatures around 200C or greater, WHY was this particular material (PTFE) chosen as the choice for this coupler? It seems to me that this was chosen so that we would keep purchasing these dumb little components over time. Surely there is a material that would be much more durable to the printing temperatures that we use than this. No WONDER I see a bunch of melted brown gunk when my UM2e starts to clog: the PTFE coupler has begun to burn and flake off, going inside of my printer nozzle and messing up my whole operation. I use this printer a lot, but now I am starting to regret getting this company's product. Great job, UM, and also, nice work on making this nozzle NOT easily replaceable (need to open up the entire extruder end effector). You guys are heros. Please fix these problems in all your future models.