I made this filament holder because i had problems with the line getting squeezed in between the extruder and the printer. 

It just fits into the hole in the acryllic cover. It's made for the lines that came with the printer, and you can still use the filament sensor when it's on.

I made it in Onshape, so here's a link, if you want see it or modify yourself beforehand: 

https://cad.onshape.com/documents/d0ca09c52fdd784d1e455159/w/43b0700ca4f8dd0eba4bad48/e/2726157d39be30affe497dff?renderMode=0&uiState=63c6b4a373fdbb227cc7ef7d