Ive had the Hemera on my Tevo Flash with 2100 drivers for 3 months and struggling to get decent quality prints. VREF set to 1.19 and I also set it back to 1 but there was no difference so set it back to 1.19 Esteps set and it extrudes 100mm spot on. Ive tried coasting, combing on and off, outer walls before inner walls on and off, infill before walls on and off, different temp and fan settings for a few brands of PLA, and retraction settings from 0 to 2mm and at various speeds. Candy floss stringing is an issue, but the outer wall is very untidy. Fitted the E3D V6 to the Tevo Flash last year, set the esteps and it printed great no stringing or print quality issues at all but for the life of me I cant get the Hemera close to how the standard or the E3d V6 Flash was. In the photos the item on the left is combing all and on the right combing is off with retraction at .75mm and 35mm/s, print speed is 40mm/s and travel speed 90mm/s The Benchy is my first print with TPU, Ninjaflex 85A and that's come out nice for a first try with TPU..