This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/eDOnNPHJ2po
This is a Spool Holder to be mounted on top of the Anet A8 Prusa i3. I found the original holder design on thingiverse and modified it a bit so there is a filament guide and the threaded rod does not need any nuts screwed on.
a8_prusa_i3_top_spool_holder_with_spacer.stl | 259.5KB |