Maybe I just haven’t cut enough tubing, but I’ve never really been in that much of a hurry. If you are, however, you might be interested in this: a tool advertised as “the world’s fastest tubing cutter.”
It looks like a pair of pliers with about a half-dozen different holes and cutters on/in it. The hole farthest to the left is the actual “cutter,” which appears to be pretty much like the two-wheel kind we’ve always used, but with four cutters — two on each set of the pliers’ “jaws.” The maker claims the additional cutting wheels allow it to cut in just 90 degrees of rotation.
Next (moving right) is a small hole that’s for cutting 3/8″ tubing “in 180 degrees.” After the pliers’ fulcrum we see a large hole which is designed to “true tubing” — to make it round again after you mangle it with something like, for example, the “pinch off” part of the tool (next in line, right before the grips).
According to the ad, the QuadCut ships with four replacement cutting wheels as well as two adapter inserts “for 1/2″ and 3/4″ OD AC/R tubing” — all for the retail price of just a nickel shy of $50.
The QuadCut [Hand Tools, Inc.]