Can I use a metal filament on M3D Micro (or Pro)?
Most 3D printers that use non-proprietary filament can print exotic filaments, such as the ones you mention. One thing to be aware of, though, is that some of these filaments wear down the nozzle far more quickly than ordinary PLA, and therefore should be used with reinforced nozzles (unless you have extra nozzles to spare). Carbon fibre and metallic filaments are generally known to increase nozzle wear, while softer alloys such as wood and bamboo generally are less abrasive.

A quick google search reveals that many people have used non-proprietary filament on the M3D Micro successfully, but be aware that using such filaments is not covered by your warranty. If you are going to use abrasive filaments with your Micro, I would check that M3D allows you to replace the nozzle first.