This is a parametric drain sieve inspired by the Shell Company logo.
I have uploaded the stl file and a rar file containing the Openscad script and necessary dxf files

Fabricate raft-less with a 3D printer. Printing raft-less would ensure the embossed design is printed clearly. If you cannot print raft-less, then print the shell profile (with the embossed features facing upward on the build platform) and the drain insert separately, then glue them together.

Note: For MakerBot printing, ensure the print head is centered on the build platform. Failing to do so would result in collisions with the bolt heads.