Export in inches or mm?


#1

When exporting a simple stl, and import them in Cura to 3d print them, the scale seems to be off. In Cura I use mm,. Is there a way to set the preferences to mm or inches? Or am I doing something wrong?


#2

Currently units are in mm, but we are working on improving the unit system.


#3

So, does that mean if I draw something 2.75 inches tall and export it, the .stl will be 2.75mm tall instead?

P.S. This is a loaded question… it just happened to me.

I know this topic is a year old, but it might just still be relevant. Please advise!


#4

STL does not support units. So if you export to STL it won’t contain any info about the units.


#5

Sorry for the long rely time. Life got in the way…

I think I found a repeatable bug.

90% of the time I work in mm, but I just got a couple requests to design a few things using inches.

To my surprise, when I exported stl, it object was very small.

After your helpful reply, and a little experimenting, I realized that your stl export converts my 10 inch cube, to a 10mm stl!


Please add this to your next release!


#6

As I mentioned before, STL does not contain any unit information. It contains dimensionless numbers. If you create a 1x1x1 inch cube in Fusion, Rhino or any other system, and import it to cura, it will interpret the numbers in the STL as millimeters. STL unfortunately is a dumb format, and it is a shame that it is the standard for 3d printing.


#7

I see now. I guess still didn’t completely understand.

I’ll just scale all my inch work to 2540% and call it a day!

Thanks for clarifying…again :slight_smile: