You can always ink your wheel by rolling it
on your ink pad. I did this with my Square Pegs jumbo wheel for the favors for my DD's frst birthday party. If you ink it well, I think it would last across a 12 x 12 piece of cardstock. You just have to re-ink your wheel, so it's not as convenient as the ink cartridge. I wonder when SU will offer all the colors for the jumbo wheel...???