I have tried PETG with no success, same with ABS. I very much doubted TPU. I took a chance and WOW, tried first and got good results. I printed on an Anet A8 direct extruder, 25 mm/s, everything moves even without retraction, as you can see from the tension. Die temperature 215°C, bed 69°C. The fan is not on. I tried pink first.
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