Symptoms: Extruder stops...extruding Idler/drive skipping (idler lever jumps, tightening idler screw to within 25.4mm of death fixed it) Stepper motor gear skipping (drive gears visible from the top are not moving but the stepper motor ticks furiously) Filament wrapped around idler gear, twice! Filament: Hatchbox black PLA 1.75mm kept in Polybox Edition II with 1/2 metric ton of silica gel. Hardware: Hemera coldend (filastruder) E3D titanium heat break (filastruder) uxcell Snowfan 40mm x 40mm x 28mm (Amazon) i.e., mini turbine jet - took off a piece of my thumbnail and finger tip Apparently can be used to cool smallish fusion reactors It's a beast. Maxiwatt 50W 24V heater (Amazon) E3D 0.4mm nozzle (Amazon) Ender 5 Plus (ebay), unenclosed. Software: Cura PrusaSlicer Marlin 2.0.6 Settings (in an exhaustive number of combinations): Hotend: 185-210° C Bed: 60-65°C Speed: 10-80 mm/s Cooling: 0-100% Retraction: 0.0(off)-1.0mm, 20-35mm/s Layer heights: 0.12-0.3mm (I can't seem to figure out how to post pictures....) Hmmm, what else to write? I've been having some of the same trouble other people seem to be having with their Hemera, maybe "heat creep"? It seems the filament near the drive hobbs/gears seems to blob up and jam the works. Photo 01&02: I just took it apart for the 1,000th time and found the filament had wrapped itself around the idler. Photo 03&04: To my surprise, when I shined my flashlight on the gears, there was another layer of filament wrapped around the idler! Photo 05: After removing the second layer of filament around the idler, low and behold this monstrous blob of which I had never seen before in my previous 999 disassemblies. Photo0 06: all the pieces I removed AFTER the first layer of filament. (I thought that was the only piece so I threw it in the trash along with 1,000,000 other little pieces. I should have kept it to neatly picture with the rest of it's brothers/sisters.) Photo 07: Picture of the first prototype. The next version uses a remote two-stage hybrid fan:120mm blower fed by an 80mm axial fan to a duct that diverts half the air to the heatsink and the other half to the nozzle to cool the part.. Any solution to this besides the washer trick (didn't work for me with a ceramic washer) and mucking about with the settings?