Train Track Support - Reinforced

This is a remix of the track support posted by MobyDisk. I found it was a little bit narrow to work with all the tracks and the sidewalls were too thin and broke easily. After a few design iterations I found a version which can survive the knock-it-off-the-desk-onto-the-cement-floor test. The inverted ribs seem to work great for strength and impact resistance. Concept will probably be useful elsewhere. I printed this with 25% fill in white PET+ on a 2014 Type A Machines Series 1.