Here's how I like to engrave metal with a Dremel rotary tool. You can use whatever rotary tool you'd like, a Foredom, a Dremel 3000, a Dremel 4000, I'm using
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Attempting to Engrave Metal with a Dremel
How I Engrave Metal with a Dremel (LockPickingLawyer + Shot
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Engraved Tumbler with Tungsten Carbide Burr + Tips and Tricks
How I Engrave Metal with a Dremel (LockPickingLawyer + Shot