I agree with both the Kettle and a swan morton scalpel. I use them both every day and have done all my career. Indeed, I am on my third handle as the repeated fitting and removal of hundreds of blades (sometimes five a day whan cutting mould rubber) wears the slots wide enough that the blade pulls out when I am carving out apetures or cutting deeply into rubber. My blade of choice is the No11, as it has a shoulder to support the point which is useful when cutting thick plastic or carving.
But my one essential tool is a swiss needle file with a broken point. This I use for scribing panel lines etc. It is irreplacable as todays needle files are crap with the ends suddenly hurtling to a point rather than gradually ending.
The Mincraft drill is pretty good as well especially when plugged into the larger variable transformer. Dremel has its place, but the lowest setting is way too fast for what I do with it:O)