Spiral bitholder

A stand for hex shanked drill bits This is a remix of hex bit holder by Fitzterra (https://www.thingiverse.com/thing:1686330). However, this remix evolved until it is now almost completely, but not entirely, unlike the original, and has the following features: * Stepped spiral layout of bits * Mostly parameterised * A central hole with a larger clearance for a stepped drill * Cutouts showing bit size are an artefact of the spiral drawing technique, and go all the way down to the bottom of the bit. * Hex or round holes * Extended base for added stability * Just for fun, the base and centre platform are hexagonal To do (but probably won't ever get done. Remix it!)): * Make the outer surface a smooth curve, (and a circular base to match) * Make the top surface smooth instead of a staircase * Allow users to optionally add outer sides to the holes * Parameterize base size * Fillet corners