Designed to rotate a miniature in 3 dimensions, this base consists of two interlocking rings which can be rotated freely. Turning the rings allowing the miniature within to be rotated to face any direction. The ring is marked at 30 degree angles, but the miniature can be turned to face any angle. Friction from the large surface areas in contact holds the miniature in place.
The inner ring is about 5.5cm/2.1" in diameter, while the outer ring is about 7cm/2.75" in diameter. The example model (an NSL light cruiser from GZG) is about 5cm/2" long. This size of ring should work with models up to 6cm/2.5" long (as long as the mounting hole is in the middle of the ship) - the slight flex of the rings will cause anything longer to hit the bottom of the ring if pointed vertically upwards. There should be no problem with friction holding reasonably balanced metal models of this size in place - the only problem I have had is so far is with am unbalanced designs with a resin front and metal rear where the heavy rear causes the model to spin on its own.
This design has been tested with White Strong and Flexible material - the slight roughness of the materials works well to hold the rings in place while the slight flex makes it more robust. It should work with any coloured strong and flexible materials, but other materials such as White Details are probably too smooth and brittle.
This design comes with a 3mm wide hole in the inner ring which can hold a standard flight peg cut to the right height tightly - I haven't needed to use any glue to hold any models in place so far. This allows a single ring to be used for multiple models, and for models to be swapped from standard bases to ring bases and back.
This design includes a 4cm diameter circular base, marked in 30 degree sections.
The spaceship model and flight peg are not included.