This isn’t a bad idea, the author basically uses a 3D printed “shape” as a mold and then builds the part with epoxy.
http://hackaday.com/2015/11/20/stronger-3d-printed-parts/
How to here
http://www.instructables.com/id/Strengthening-a-3D-Printed-Part/
You could color the epoxy with toner too
http://hackaday.com/2015/09/04/tint-your-epoxy-resin-with-toner-powder/