Retired doctor, clinical terminologist, mechanical puzzle designer and model maker.
Builder and owner of nine different 3D printers - Bambu Lab X1-Carbon, Elegoo Mars 2, Mini-CoreXY, twotrees Sapphire-S, Creality CR-10S, E3D BigBox Dual IDEX, RichRap 3DR, Mendel90 and eMaker Huxley.
Some of my puzzle designs are featured at the extensive puzzle archive maintained by Rob Stegmann:
http://www.robspuzzlepage.com/interlocking.htm#richgain