Lots of stringing but as I understand that's normal for TPU. Printed at 225⁰C on a 30⁰ bed, stock Ender 3 S1. 0 retraction, 0.93 flow, 35mm/s for most speeds
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On my direct drive Voron I could make it through retraction tower test prints fine with TPU, but it would always jam with retraction enabled on longer prints with my usual 0.3mm. Pulling apart the extruder would always reveal some TPU had gotten wrapped around the drive gear. Rather than try tuning until the failure went away, I just went with 0 lol.