I tried my exacto knife but it took forever and was not very flexible. It was also murder trying to cut through pewter with it. When that failed I broke out my Dremel tool and gave it a shot. It also failed to meet my requirements.
I did a bit of looking around on the internet and found what I was looking for - a jewelers saw. The jewelers saw is perfect because it meets all my needs and is highly adaptable because you can swap out the blades.
I have a very fine toothed blade on my saw right now. It is crazy thing. I can actually curve the blade as I cut through a model with it. I have had a few blades break while cutting through pewter but they are less than $4 for a dozen blades.
I picked the one below up for less than $20 at my local hobby shop.
