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- Hi Amar,
We experience the same situation as you before, with the same extruder running at the same speed, 300 m/min, the surface sometimes shiny and sometimes dull.
Therefore we feedback this problem to our material supplier and they found that they have switched the heat stabiliser additive. They managed to resolve the problem after that.
Take note, heat stabiliser is expensive additive, therefore suppliers are trying really hard to reduce the amount to achieve good surface finish.