Thanks @bbeaudoin this printed great and fits and works perfectly, cuts cost to 1/4 of dremel labeled filament. Used the last of my dremel brand filament for this, perfect ending for those overpriced spools. Used an rc servo mounting screw for the vertical arm.
Needed some sanding to smooth out holder o.d. and internal i.d. of the spool to make smooth and free spinning (which is expected)