Hi @Desperate3D, thank you for your post and welcome to the community.
I assume you mean you have an Ultimaker 3, or Ultimaker 3 Extended? We don't have an Ultimaker 3+ series.
Regarding your question, when your print finishes normally it automatically should retract your filament a tiny bit, so it should retract easily when you change filaments. Therefore it should not have to heat up when you change material. How do you mean the material won't be rejected? Can you describe what happens when you want to change filaments?
Thanks,
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Cazl120 0
I have the same problem and it still prints but I don’t know how to heat the print core. How do you heat it?
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