SeeStar S50 Vixen mounting adapter
Suggest printing with a minimum of 4-walls as this will be plenty strong enough to deal with repeated clamping in most Vixen telescope or photography mounts.
I use the Orca Slicer & like 3D honeycomb as the infill to provide additional strength.
Supports will be needed under the counterbore of the cap screw if printed in the orientation as provided.
You will need a 3/8-16 x 1-inch long socket head cap crew to attach the SeeStar S50. A button head cap screw of the same size will also work.