Hi Jacob - when you use the "preserve units" option for PDF export, MoI will only do some minimal processing of the coordinates so the conversion process can be directly controlled by yourself. To use this mode you will need to place your objects in the appropriate positions so that when converted into the PDF coordinate system they will be visible on the printed page. You could do something like draw in a rectangle of your expected PDF page size in the MoI model so you could have a better idea of what area in MoI's space maps to the page.

Right now it's likely that after being converted into PDF coordinates, your objects are way far away from the 0,0 page origin point and so are not visible on the printed page visible area.

I guess in the future I should make an option so that you could click somewhere to set a particular point as being the PDF page lower left origin point. But currently the 0,0,0 world origin is what will map to the PDF page origin.

Does that make sense for what you are seeing? If not, can you post the 3DM model file of the thing you are trying to export and also tell exactly what options you are setting on the export options dialog?

- Michael