This thing allows you to turn a Craftsman fixed-base router into a removable base for jigs, CNC, and other cool stuff.
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(In my case, for Matthias Wandel's tilting router lift.
http://woodgears.ca/router_lift/index.html)
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Read the instructions tab before printing.

Tested with Craftsman model 315.269211
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Caveats:
1) This involves stuffing high-voltage MAINS electrical components into a printed package. DO NOT do this unless you understand and accept the risks!!!
2) Far less important, but still a consideration: The LED module within the base is now disconnected so you have no more light. I never really could see much down there anyway, but if that's a big deal, you might have to come up with some kind of connector.
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Installation:
1) Unscrew the handle and remove all electronics.
2) Install electronics in the printed enclosure and glue closed.
3) Re-assemble the handle.
4) Slide the enclosure into the slot left behind by the switch.
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Use:
1) To remove the base of the router, simply slide off the printed part.
2) Then un-screw the height adjustment, depressing the lock pin with a screwdriver (see pics) when it bottoms out.