DIY Isotope Holder - WIP

I've never been happy with the isotope holders available, always seem to be a compromise somewhere so I decided to try and make my own.

I'm a CAD designer by trade and I'm lucky enough to have access to a 3D printer, so I came up with a couple of designs and had them rapid prototyped. They were to designed to suit my solar 3.5mm diameter and 25mm long isotopes. Still WIP but hopefully get something more suitable for my Barbel rods. :)