Printed using the triangular base, which works well as designed. The posts/gears fit up were tight enough on my print that I didn't need to use the locking rings.
Printed using M3D ABS-R in gray. I should had the heated bed too hot, so the longer (70mm) arm I printed warped slightly when removed from the bed. This the Gunpla model to require very careful balancing. Print is a bit rough on the Micro+, but the design is great.