Designed to print without support at 0.25 mm layers.

Three different sizes: 45, 50 and 55 mm centre-to-centre between adjacent eyepiece cups. The eyepieces are held in place by M3-screws, so six screws (8-12 mm) and matching heat-set nut inserts are needed. In the middle of the central bowl there's a 5 mm hole and a slot for an M5 nut for attachment.

*: ID and ST are rounded to up to nearest mm

¹: Inner diameter of the hexagon = 2S×cos(30°)

²: Sides of the theoretical outer triangle = 3S

Common for all sizes: depth = 30, total height = 31.75, eyepice hole diameter: 32.32, wall thickness: 2.84

The extrusion for the holding screw extends an extra 4mm (parallel to the cup on to the right), beginning 16.5 mm from the bottom.