Customizable bobbin - for all your electromagnet needs

Openscad parameters:

SHAFT_LENGTH
SHAFT_DIAMETER
SHAFT_HOLE_DIAMETER
FLANGE_LENGTH
FLANGE_DIAMETER
FLANGE_HOLE_DIAMETER
FLANGE_NUM_HOLES
FILLET_LENGTH
FILLET_THICKNESS

Source: https://github.com/tylerhaun/openscad-bobbin