About this 3D model
These caps have a mortice and tenon style connection. They fit together well and give you a place to add glue if you want. This is a better version. http://www.thingiverse.com/thing:1988435 Below is a link to my 2 spinners: http://www.thingiverse.com/thing:1844145 http://www.thingiverse.com/thing:1842914 Print Settings Rafts: No Supports: No Resolution: .2 Infill: 100% Notes: I printed mine solid. Probably doesn't have to be.