This a a small storage tube for 608 type bearings that are used on a lot of RepRap type machines. I got fed up of hunting around for them at the bottom of draws, and wanted to do something as a thread test so made this! The Thread is a Standard M30x2 and works a treat! i have printed mine on a fair;y fast setting, and i had to work the thread a little to remove all the small high spots, but after that its perfect! so with this in mind maybe a good print quality setting would be better.