I performed a polycarbonate modification on my Ender 3 Pro (heated chamber, external electronics, all-metal hotend, new thermistor, PID-tuning, dry-box, actively cooled motors through Peltier cooling, ABL leveling, polycarbonate printing surface, etc...). Basically, I did everything based on this:

Currently, the maximum possible temperature I can reach in the chamber according to my additionally added temp-sensor is about 65 °C. Near the printing bed, it could be a little bit warmer.

Please take a look at the following image of my current polycarbonate print. As you can see there is something wrong going on there, especially at the corners. I really don't have a clue what is causing these problems. Maybe you have more experience and some advice for me? (Please ignore the horizontal "Raft Air Gap" it is not a printing issue)

For detailed information regarding the pc-material take a look at the technical datasheet of the polycarbonate material:

Photo of a printed model in polycarbonate with printing errors highlighted

And these are my Cura settings:

  • OS Windows 10.0.22000
  • Cura Version 5.0.0-beta+1
  • Material Extruder : 1 PC


  • Layer Height 0.1 mm


  • Wall Thickness 0.8 mm
  • Wall Line Count 2
  • Horizontal Expansion 0 mm


  • Top/Bottom Thickness 0.6 mm
  • Top Thickness 0.6 mm
  • Top Layers 0
  • Bottom Thickness 0.6 mm
  • Bottom Layers 999999
  • Initial Bottom Layers 999999


  • Infill Density 100 %
  • Infill Pattern Tri-Hexagon


  • Printing Temperature 265 °C
  • Build Plate Temperature 100 °C


  • Print Speed 50 mm/s


  • Enable Retraction True
  • Retraction Distance 1 mm
  • Retraction Speed 20 mm/s


  • Enable Print Cooling False


  • Generate Support True
  • Support Placement Everywhere
  • Support Overhang Angle 63°

Build Plate Adhesion

  • Build Plate Adhesion Type Raft
  • Raft Air Gap 0.2 mm


  • Machine Type Creality Ender-3 Pro
  • MicroSwiss All-Metal Hotend (0.4 mm nozzle)
  • $\begingroup$ Probably best to ask the people who you got the tutorial from $\endgroup$
    – Kilisi
    Jun 5 at 1:12


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