Default supports can result in a rough contact surface on the model. The settings described in this guide will improve the appearance of the contact surface between the model and the supports. The adjusted support contact surface is shown in the image below.
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a. Enable supports and set the support type to "Normal."
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b. Set the support/raft interface material to PETG, set the Top Z Distance to 0, and set the support interface pattern to "Lines / Overlapping Lines / Grid" (Lines recommended).
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After completing the above settings, slice the file and start printing. The contact surface between the model and the supports will achieve a smooth finish.