You buy a caldera cone ti tri to specifically fit a .5L pot, a 1L pot, a 1.5L, 1.6L, 1.9L, 2L, etc. pot. There are also sizes for wide or tall pots. When you buy a windscreen for a particular sized pot, the windscreen will only work with that sized pot. i.e. – A windscreen for a .5L pot will not work for a 1L pot.
The zelph woodgaz titanium windscreens are designed to work IN THE ALCOHOL OR ESBIT MODE primarily with flat bottomed fosters cans because the can must go down inside the windscreen. There is a little bit of wiggle room, however – an inch or two. In the woodburning mode the stove will work with a wide variety of pots because the pot sets on top of the windscreen. If, on the other hand, you choose to use an aluminum windscreen (no wood burning), you could use any reasonable-sized pot.
Hope this helps, Hikin Jim.
PS – I like your blog. Been following it for over a year. Glad you are back!