DO NOT MAKE THIS IF YOU WANT A FUNCTIONAL DRAIN COVER! Not enough water will flow through it! See my other designs... :-)
this is a replacement drain cover for a slotted one that lets all the
3.25" bolt circle x 3 bolts. Flange is 0.15" thick. OD of flange in 3.62"
"Funky" has a custom designed pattern with a flat bottom and raised
top. My other one has round drain holes and reinforced bottom.
measured the existing one, and then added my own drain hole pattern and thickened midsection for strength. Used visio to draw face pattern (uploaded) and then exported from visio to 123D via SVG format
(attached). Extruded faces then faceted corners after subtracting a
large concave face I created. exported as STL in to MB desktop. For
the FUNKY one, I created a helical pattern overlaid on concentric
circles to create the voids.