Rectangular-type Holders for Micro-CT Scanning

A series of 1.5 mm, 3 mm, 5 mm, and 7 mm wide rectangular or slab-type specimen holders for micro-ct scanners. I originally designed these to hold fossil slab specimens, but have found them useful for a variety of other solid oddly shaped specimens too.

The artifacts shown in the 7 mm holder are corrected in the stl uploaded here.