[HumblePie]

We are fortunate enough to have access to a 3D printer. So, for smaller plastic and/or wood parts (smaller than the printer envelope), I find that a printed template, along with a pattern trim bit on a benchtop router table does a pretty nice job. You can rough cut the parts slightly oversize, temporarily affix the printed template (w/ double-sided tape or screws) and trim on the router table for accurate geometry and a nice smooth edge. Larger parts can be accomodated by designing the template pieces to be interlocking.