Summary

If your metric software imports itsy-bitsy microscopic parts, scale the file up by a factor of 25.4 in X,Y and Z. But I guess you can scale these things however you please.

With an Afinia printer, in the "Fill" section, in printing preferences, select "Shell". Then it'll be empty inside...

A tall one needs about 44 min and uses 15g ABS. 0.30 layers.