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  1. Thank you for your answers. @geert_2, I've tried to print my parts an other time and I watched the printing process more closely. I observed exactly what you describe (about the "worms" thing and the brown spot), some filament is extruded ("leaks) while the printcore travels. Also I print with two materials at the same time (PET, printcore 1, for the part and PVA, printcore 2, for the support), and it worsen the leakage problem. The moment when the support part is printed (PVA) gives more time for the PET to leak from the first printcore. I will try to slow and cool my next print, a
  2. Hi everyone, I have just started to print with PET filament and I observed some defaults on my first attempt. I have an UM3. I set the printing temperature on 235°C, the bed temp on 50°C, and the printing speed on 30 mm/s. Overall, I am satisfied with the result but I observed some stringing and some holes (very thin) on the surface. The odd thing is that I printed two identical parts at the same time, and only one of them has those defaults. Retraction was enabled (on Cura, I kept the defaults settings). I would really appreciate if you had any thoughts on the fact that it is
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