I am trying to create a small, rectangular container so I make a block and use the shell command to hollow it out. I pick the top surface to remove and set the wall thickness to 2mm. Everything works perfectly on the screen and the resulting container is what I am looking for. I export this to STL binary file and send it to my MakerBot Replicator 2X printer. The file shows up as a container on the printer dialog box also. When I print the container though, it is solid. Basically, I have a 1 mm wall on all 6 sides and a 10% fill of the complete interior.
I have redrawn this and re-exported it several times with the same results. It appears that the ‘shell’ command is working on screen but the results are not being exported with the STL file.