Server rack cable management ring, with gap for inserting cables.

Could be mirrored for opposite side of the server rack, however i do not find it necessary and its easy to do in the slicer 

My fusion skills are not the best, but the .f3d file is included for your remixing pleasure. 

NOTE: revision 1&2 are pictured, however only version 3 is available. Same basic design but revision 3 is much thicker in height.