PMMA

PMMA, short for Polymethacrylate, most commonly known as "plexiglas", see also: https://en.wikipedia.org/wiki/Poly(methyl_methacrylate)

Melts at 160°C (even earlier than your printer's PLA or PETG), so be careful when choosing cutting speeds and attack!

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See also:

• Cutting speeds (Indymill) ‎ (← links)
• Cutting Speeds (Mecpow X3 Pro) ‎ (← links)