I needed to route filament from a filament dryer up to my printer from the lower shelf, so I decided to design this. Attach solidly using some double-sided tape. 

It does need some supports at the circle and the top hanging part. 

OnShape link: https://cad.onshape.com/documents/72986effff42e305fac79b3a/w/e459a0505366a67269364e2f/e/b3473674be0d3431f726e1f9?renderMode=0&uiState=63dec3b9623db51ac70d9bde