Hi Burr, well that does seem to point to a problem in Bobcad where it seems to work internally in mm and has some kind of error when importing a file with units in inches instead.

I guess what I would recommend would be to tell the BobCad people that you're having a problem with importing .3dm model data when the units in the file are set to inches.

Give them 2 .3dm files - one file with the sphere with 5 inches and explain this seems to give the incorrect value of 5.002 units when imported into BobCad, but if the units are set to mm and you have 127 mm (5 inches = 127 mm), that seems to work fine.

Please let me know if you find anything out from them.


It looks like for the time being a workaround for you would be to convert your units to mm before you do your export into BobCad. MoI will handle the scaling for you, so for example when you switch your units to mm your sphere will be converted from 5 inches into 127 mm.

- Michael