An unofficial list (14!) of what metals you can engrave with the Cricut Maker's Engraving Tool and the Cricut Material Settings to use!
How to Engrave Stainless Steel Servers with a Cricut - Well
How to Engrave Stainless Steel Servers w/ Cricut Engraving Tool
Cricut Engraving Tip + QuickSwap Housing, Premium
Cricut Maker Engraving Tip
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Spray Paint Metal For Engraving with a Cricut - Well Crafted Studio
Cricut Engraving
How to Engrave Aluminum with the Cricut Maker
How to Engrave Galvanized Metal Gift Tags with Cricut