I have a problem with my Hemera. It's a recent problem that happens with all my filaments. Original X nozzle is used and I changed it, I changed the heat break tube, the block, the thermistor, the fan... but I can't solve the problem. It isn't a heavy stuck in the tube. I use 0.2mm as retraction and try it in all the temp margin with every filament. I load the filament without problem, starts to print,... but after 20-30 minutes stops to extrude and I have to stop and clean. I have the problem with Sunlu Pla+, FormFutura PLA, FormFutura metallic PLA, FormFutura Volcano and with the special FormFutura CarbonFill. The stuck isn't in the nozzle, is in the heat break around 1cm from low part. It's like a step that I have only to push with a 1.5 metallic dipstick to work another time.