What makes this PETG clear rather than just a pale plastic?
It is printed uncoloured. Pigment scatters light inside the wall, which is why a coloured part looks solid, while an unpigmented PETG wall lets light travel through it and shows the printed layers. The part is translucent plastic, not glass and not crystal - polishing or vapour work is not needed for the effect, and it is not glass-clear.
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