Sears sells a small ratcheting tubing cutter (up to 1-18" capacity) that will let you cut tubing without having to rotate the thing all the way around once it's tightened onto the tubing. I find it works pretty well on the bigger sizes, but on the smaller liquid lines (1/4" or 3/8"), it tends to mangle the tubing if you're not careful.
My question is whether anybody makes such a thing that can handle up to and including 3" PVC or ABS for cutting high-efficiency furnace venting lines. I hurt my elbow sawing through a couple of them two years ago and I can still feel the pain sometimes. I have heard of larger rotate-around cutters like the small ones we use on copper tubing, but I think if there was a larger ratcheting model available, it would definitely make cutting vent lines much easier, especially in the tight spaces they always seem to be in (there isn't usually any room to rotate fully around the intake or exhaust line - you're lucky if you can even get a saw in there most times). The other problem I find with sawing is that it's really hard to keep the cut straight across, and it generates a lot of chips both in the pipe and on the floor (which you have to clean up later).
Has anybody run into this problem cutting high-efficient venting (while repairing or installing retrofits, etc.)?