Hello Everyone,

I am a student of aviation at my local community college and I am working on building a drone I have designed with a 3D Printer, I have some files I need prepared professionally. Can anyone on here help me out with this?

http://www.prepar3d.com/forum/viewtopic.php?t=107184

View project above, I have all the .dae files but the issues I am having is simply not understanding why hollow parts are building printed solid. Plus I lack experience with 3D Printing and preparing files.