Here's a little pin router I built to accurately cut MoP and other inlay materials, and to rout inlay cavities in wood/metal/composites from templates so they fit like a glove. It's pretty much a miniature version of a normal pin router except it doesn't have the foot adjustable height - something I didn't need because I'm only going up and down by 1 or 2mm. Basically, it's a Dremel with a 3/32" (2.4mm) tungsten carbide cutter connected to a slider that allows the Dremel to be raised and lowered. The Dremel sits sideways to keep the aircooling vents unobstructed. The shank-end of a 3/32" (that I snapped with a hammer - try cutting a drill bit!) is banged into a hole made by lowering the cutter on the Dremel successively into the base plate. The base plate is not connected to the tower and is removable by uncrewing 4 screws so different cutter/pin size combinations can be used - or if something gets out of alignment. The slider to raise or lower the cutter locks with a wingnut inside the tower. For a test I cut a random shape from 9mm MDF and superglued it to the bottom of a piece of plexiglass with four stoppers to keep it stable. Using double sided tape I stuck a piece of 1mm MoP to the other side of the perspex and whipped the cutter around it with the pin aligning the template and the MoP so both shapes are identical. The cutter has a round tip, so if you look closely at the routed MoP there's a slight lip left on the edge that requires another, deeper pass so the sides are perpendicular. I might just buy a square-tip bit instead. Next comes the dust extraction part. Something like a vacuum port just above and behind the cutter. I'll document how to make the "positive" and "negative" templates (one for the inlay, and one for the rout) in the next couple of days. All up it cost (minus the Dremel) about $25 in materials. The Dremel unscrews.