Dremel Flex Shaft Mill Adapter for LulzBot Taz

This is a redesign inspired by [solarnetone's holder](https://www.thingiverse.com/thing:1053303). It prints without support but does require a few cap-head screws & nuts.

But you probably shouldn't do this!
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* The tip of an extruder nozzle exerts almost no torque on the carriage. The end of a milling tool, however, can act as a lever exerting significant torque on the carriage and rails. The machine has no way of sensing this and will happily destroy itself. You