Several times I've noticed questions regarding how one might mark their Ti pots for measuring cups of water. I just made a jig and scribed 1/2 cup marks in my BPL SUL1100 Titanium pot.
The process is as follows:
1. Get a stick of wood that's a few inches deeper than your pot.
2. Using an accurate measuring cup (I used 1/2 cup) pour one full measure of water into the pot.
3. Dip the stick into the pot, resting the stick firmly on the bottom. Quickly remove the stick and mark the water line on the stick. Add one more measure of water and repeat, until you reach the largest amount of water you'll ever be boiling.
4. Use a square to draw a line 90° across the stick at each mark you've made.
5. Drill a hole completely through the stick, using the line to keep the hole as close to 90° as possible.
6. Mount a "cross bar" on the stick so the cross bar rests on the pot rim, when the stick is firmly pressed to the bottom of your pot.
7. Insert a sharpened nail, or other hard metal as you may have, firmly into the hole closest to the end of the stick. In my case it was the 1/2 cup hole. I used the pin from a metal scribe. Very hard, very sharp.
8. Keeping the stick firmly pressed onto the pot bottom, rotate the pot, while scribing a line around the inside circumference of the pot. Move scribe to next hole and repeat.
Scribing the pot
It's not difficult and took me about 30 minutes, including assembling all the parts. I did have to recharge the Makita battery.