In the options when I press restore defaults for everything the unit system settings dont appear to change. When I export to an .STL the object is too small in the slicer software. But knowing the very issue, I go and set the unit system to millimeters in Moi which usually fixes the problem. But now it appears my model is only half the size in the slicer upon export. In the slicer I scaled by 200% and I (think) that is correct, but no longer in Moi. Now I am so confused about what scale everything is. What are the default settings in unit options? Perhaps I have something checked that I don't want checked. In either case restore defaults button doesn't seem to truly default things. Do I need to delete the .ini file?

Hi Art, units can be problematic for STL format because there is no method in the STL file format that indicates what unit system the file's coordinate values are in. So an app that reads in the STL file doesn't have any way of automatically knowing the unit system for the file. Often times slicer apps will just assume that it's in mm though.

There is an option under Options > Import/Export > STL options > "Export units conversion", which you can set to convert the STL output to a specific unit system. So probably the easiest thing to do is to set that STL "Export units conversIion" option to Millimeters.

Resetting the options in moi.ini is probably not going to have an effect, that's because unlike STL format, 3DM format does have a setting to store units and so when you open up a 3DM model file into MoI, the current unit system becomes the unit system that was stored in the 3Dm file, not any unit system set in moi.ini .

That's if you use File > Open to open up your main project file. If you're doing something else like using File > Import, copy/paste or something else then that can be a different case.

- Michael

Hi Michael, thanks for taking the time. That export setting in options is good to know. I was able to resolve this issue. I believe I did something along the lines of copying the solids. opening a fresh file. Changing unit system to inches (as that is what I initially started with file revisions ago). Pasted solids in. made sure "scale on unit system change" was checked. Changed unit system to millimeters. At least that's how I think I did that.

HI,

Concerning the unit, I'm not sure I understand what the "unit options" button is.
Why is there a second set of unit system ?

Marc

Hi Marc,

re:
> Concerning the unit, I'm not sure I understand what the "unit options" button is.
> Why is there a second set of unit system ?

The one on the main dialog sets the unit system for the current open model.

The one on the "Unit options" dialog that says "Default unit system" sets the default that is used when you initially start up MoI (if no template file is being used).

Changing the "Default unit system" does not change the current model units, it only changes what is used on start up.

- Michael

Got It, thanks for the clarification.

Maybe renaming the button "startup unit options" would be more clear?

Thanks,

Marc

Hi Marc,

re:
> Maybe renaming the button "startup unit options" would be more clear?

Well there are 3 options on the dialog that it pops up, and only one of the 3 involves startup.

- Michael