You can use an automatic center punch to simply make a dimple at the level you want. Less than a second.
If you want bigger marks, you can scribe them in with a metal scribe...mine is carbide tipped and will etch glass. A tool steel (like a drill bit) will etch titanium.
I'd go with the center punch method. You can make a dotted line if one dimple isn't enough.
Titanium can be hard stuff and trying to form it with a home-made tool and die process can be tricky and ruin your pot.
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