This is more along the lines of searing the fuzz, rather than actual engraving:
The top row is 15% power at 400 mm/s, the bottom is 25% power, and the fabric was a cotton t-shirt from the Box o’ Shop Wipes.
Applying the higher power to the inside of sweatpants fabric, whatever that might be:
Both of those were easier to see in the slanting sunlight of a later winter afternoon.
The best results come from the lowest feasible power applied at the fastest practical speed, with obvious size and complexity limitations.
I think this will most useful on a removable tag labeling a piece (perhaps cut from a larger pattern), rather than branding the piece itself.
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