Hi Pieter, STL files do not have any method in the file structure to label what units the file is in. So because of this there will usually be some setting in the importing application where you can tell it what units were used, please look for an option like that in your receiving application it is probably currently set to mm and you will need to set that to inches in order for your file to come through properly.
If you can't find any such setting in your receiving application I guess that means that it only expects to receive STL files in millimeter units, so if that's the case you will need to switch your units in MoI to mm before doing the export. Then you can set it back to inches again after you've done the export. You will want to have the setting in MoI for scaling when changing units to be enabled, that's under Options > General > "Unit options" button > "Scale on unit system change" checkbox should be checked.
- Michael
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