A simple modification of potholers Key Clip to make it symmetric for a tripod. Mine is for a flower pedestal.
Scaled it to 0.05 (I think DesignSpark got the units wrong when I imported the original, so this one is HUGE now).
These are my settings, but it's not a complicated print. Just go with what's comfy for you and your printer.
Opened potholers eminent drawing in DesignSpark Mechanical.
Right clicked menu in the structure list let me "Convert to solid", with the "Merge faces" option.
Drew lines to get the centre of the hole.
Hit "Move", "Ancor" at the centre of the hole, rotated with "Ctrl" held down.
"Combine" the three resulting solids into one
Saved as .stl and in the native format (both attached)