PETG Characterization for 3D Printing

Owned by Isaac Zhang
Last updated: May 30, 2023
2 min read

Created: 2023/5/25

Latest revision: 2023/5/30

 

Table of Contents

Config File

Import the PrusaSlicer configuration file below to deploy all the i3 MK2.5S calibrated settings.

Material

Yanshen purchased the filaments in the bay. The orange ones are from PrusaFilament, but the specific model is still TBD depending on his reply.

Searching for FilamentPM as seen on the spools yielded these results, for 1 kg spools of 1.75 mm diameter orange PETG :

Common to these filaments are the following values:

  • Nozzle Temperature: 220 - 250 °C

  • Bed Temperature: 80 - 90 °C

Prusa themselves have suggested the following values for printing with PETG on the MK2.5S, based on the manual for said printer:

  • Nozzle Temperature: 240 °C

  • Bed Temperature: 80 - 100 °C

Model Material Settings

Prusa i3 MK2.5S

Use the config file to implement all tested settings, as the discussion below does not include all changes to the default PrusaSlicer templates.

Based 2023/5/24 testing using a temperature tower (how to slice), the following parameters were found to be most optimal for outer appearance of the model. Parameters not listed were left at PrusaSlicer’s Prusa i3 MK2.5S printer preset, Generic PETG filament preset, and 0.20mm 100mms Linear Advance printing preset.

Nozzle Temperature

  • First layer: 240 °C

  • Other layers: 240 °C

Bed Temperature

  • First layer: 90 °C

  • Other layers: 85 °C

Retraction

  • Retraction Length: 6 mm

  • Retraction Speed: 30 mm/s

Speed

  • First layer speed: 12 mm/s

Brim

  • Brim width: 5 mm

  • Brim separation gap: 0.1 mm

 

Since the Prusa i3 MK2.5S uses a PTFE/Teflon lined hot-end (link) (link), the nozzle temperature should not be set above 240 °C if possible. Prusa suggests a nozzle temperature of 240 °C in their manual for MK2.5S. Though a Prusa forum post with hot-end supplier’s information suggests that temperature of up to 300 °C is ok.

Support Material Settings

Based on this Reddit post discussing settings for PETG supports, it would be beneficial to use bed and nozzle temperatures at or slightly above the upper limit recommended by the manufacturer.

Another Reddit post here discusses settings for PETG supports in PrusaSlicer, these kept very good model quality after removing the supports. Use the config file to implement settings tested between 2023/5/27 to 2023/5/29.