Space Ship engine parts 7+7+20 PCS.
This is a set with 3 different sizes.
Diameter = 5mm / 3mm / 2mm !
Maximum possible detail level.
BIG 3D preview:
https://www.shapeways.com/model/3dtools/4458245/1/61?key=2374b6dfc6fca743793b540056b669ae
Other designs & dimensions on request