I was able to find an older version 2.2.1 of Up (Old name for Up Studio) that will let me view the model without first being connected to a 3D printer. Using 1WU = 1cm or 1inch works as expected.
Unfortunately Up is automatically scaling up models exported as 1WU = 1mm just like Cura does. I do not see a way to turn that off yet. As long as the Wings3D model is at least 5 units in size using 1WU = 1mm the model will not be scaled automatically. The model will import as a 5mm cube.
So it may be that Up Studio files do not need to be scaled to 0.0393701??? I am assuming that Up Studio works the same as Up.
Edit: I found the following thread in the Tiertime (Up Studio) forum that confirms what I said. Up Studio assumes that you do not want a very small model so it auto scales the object. Export as 1WU = 1cm to avoid this... Up Studio Auto Scaling very small models
I also tested with Kisslicer software and models seem to import at the correct scale with that software.
oort
Unfortunately Up is automatically scaling up models exported as 1WU = 1mm just like Cura does. I do not see a way to turn that off yet. As long as the Wings3D model is at least 5 units in size using 1WU = 1mm the model will not be scaled automatically. The model will import as a 5mm cube.
So it may be that Up Studio files do not need to be scaled to 0.0393701??? I am assuming that Up Studio works the same as Up.
Edit: I found the following thread in the Tiertime (Up Studio) forum that confirms what I said. Up Studio assumes that you do not want a very small model so it auto scales the object. Export as 1WU = 1cm to avoid this... Up Studio Auto Scaling very small models
I also tested with Kisslicer software and models seem to import at the correct scale with that software.
oort