Geocache screw lit, scaleable

screw lit container,
can be scaled to any need. big or small.
the outher part is allready +2% in X Y for clearance for threads.
this works perfect for larger boxes, like 30mm diameter and up
but if you want to make this under 30mm diameter, scale the outpar part a little but up in XY
and the inner part a little bit down in XY this way you add manufacturing tollerance into the thread clearance.