I have done a large amount of cutting and engraving felt both 100% wool and polyester. See this post for my 3mm felt. Wool engraving unfortunately rubs off over time. Polyester is better for engraving as you melt the pattern in and it looks sharp. But you don’t get as much color contrast with polyester. https://community.glowforge.com/t/3mm-felt-engraving/18147?u=phoenix
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