I've been having quite a bit of trouble with the rangefinder casing.
View attachment 107117
I downloaded the sketchup file from 3d warehouse and exported it to STL with the STL plugin. I've then tried to repair it with netfabb and makeprintable.com. No matter what I do, I end up getting defects in the part. I tried printing it as-is to see what happens, and what shows as green lines on the side in that screen grab came out as missing parts in the print... just open.
Any thoughts on what I might be doing wrong?