A bolt shaped pencil case
After spending the weekend building and testing my new MK6 extruder, I had seen quite a few of these and needed to exorcize thoughts of them rolling across the floor.
If you don't have an MK6, save up for one - they're fantastic!
STL (Stereolithography, filesize: 4.14 MB), OTHER (Other, filesize: 3.73 KB)