I recently installed a Hemera onto my Sidewinder X1. As per the instructions I updated the firmware, adjusted the VREF and performed PID tuning. I've been successfully printing filaments such as PETG and PLA with great results and I thought it was time to try TPU. I purchased the cheapest TPU filament I could find and my first couple of attempts resulted in clogging within a few minutes. When I removed the filament I found that a bulge had formed in it, as described elsewhere on this forum. I was reluctant to oil the filament as others have suggested as I believe this just masks the problem. Instead I experimented and, after a couple of prints, I got some success. I am using a 0.4mm Nozzle X, but I don't think the printer or the nozzle really matter in this case (although the Nozzle X can require up to 10C more than the stock nozzle). I've also made some modifications to the spool holder and part cooling fan duct but, again, I do not believe these make any significant difference. For slicing, I am using Cura with its 'Generic TPU 95A' material settings and the 'Fine' profile. This includes the following settings by default: Heatbed: Off - The recommended bed temp of the cheap TPU filament is: Off Print cooling: Enabled (100%) Initial fan speed: 0 (off for first layer) Layer height: 0.1mm Inital layer height: 0.3mm The only settings I modified in Cura were: Extruder temp (Printing Temperature): 230 (the default was 228, which should've worked too) - The recommended extruder temp of the cheap TPU filament is: 190 - 210 Retraction (Enable Retraction): Off (If you do use retraction start with 0.5mm distance and never exceed 2mm. The Cura default is 6.5mm!) Print Speed: 20 mm/s Theses settings improved the result of the following prints. The first few layers went down well, but it still failed at around the hour mark. The final piece of the puzzle was to adjust the tensioner: Tensioner: Backed off completely (i.e. first click) With the tensioner backed off completely, I have successfully completed several flawless 5 hour prints. It is possible that some of the settings listed above could be adjusted (such as increasing the print speed), but these settings will hopefully offer a starting point for others. If you try this, please share your findings.