I found the ‘Picktor’ Pick and Place head for retrofitting on a 3D printer on Thingiverse (GitHub) As designed it uses a Nema 17 stepper motor, however I suspect that will be too big for my design.
I got 3 x Nema 14 stepper motors from an old RepRap Huxley, however even they are a little on the large size… so going to try designing my version using a 28BYJ-48 instead, which should make it both smaller and lighter.
The originals vitamin list is a little long for my liking as well, So I am going to try and simplify that: