Simple toroid winding wire holder

Simple parametric design to hold wire to wind a toroid easily.

The end cutouts are inset the same as the width, so the default version is 30mm long and 5mm wide (for a 6mm toroid hole) so wire held for one complete wrap is
2*(L-(W*2)) = 2 * (30-10) = 40mm wire per wrap.
One turn on my particular Toroid is 2* (5.33mm + 2.33mm) = approx 16mm rounded up
So to wrap 100 turns I need 1600mm or 40 turns on the spool.
Now simplified so you just enter how much wire you want to hold for one COMPLE