As-yet untested design.
files included for both laser cutting and 3D printing

If you need DXF's just drop a comment and I'll run one off for you.

DWG is Autocad 2010 format.

assembly should be simple, add some stainless 3mm nuts and bolts to space it off the bottom of the pan at am appropriate distance.

I have yet to test this on the printer, but I assume PLA would probably not be the best choice for boiling water due to it's low melting point.