parameterized core winding symmetry guide
Its a parameterized template to help wind wires through your toroid core evenly.
I used hot glue to first attach the template to the core, then for each wrap I would position the wires at the notches, and glue the wires directly to the template.
Possibly use two, one for each side of the toroid, and third in the middle if the toriods are stacked.