I use a 45 mm rotary cutter. For awhile there I thought I had gone out and bought a 60mm and been using that but then one day a friend sent me a pack of rotary blades without any discussion of size. When I got them, it brought me back to my reality.
I bought a 28 mm recently to use with some slotted rulers I bought. During my big sort out today I found one that I already owned.....sigh... It will get used, no worries.
So here is a question for you. I am currently trimming HSTs. I watch a friend of mine trim scraps. When she does this she uses a 28mm cutter. She seems to have good control with it so I plan to try trimming the rest of my HSTs with the smaller cutter to see if that works better for me. Things seem to slip around on me with the 45mm.
When you trim what size cutter do you use??