I loved so much robathome's idea so I included a fillament seor iide. I've reused ring and space so if you already have robathome's you only need to print the new frame. Additionally, I also designed a second roller fillament gide for the top-left corner of the ender 3 frame. For the fillament seor, you will need to print: 1 - frame (FillamentSeorVx) 1 - ring - (print fit, if it isn't tight enough then is slightly smaller iide). 2 - space 1 - cover (optionally) For the top-left roller fillament gide: 1 - frame (Roller_Guide) 1 - ring - (print fit, if it isn't tight enough then is slightly smaller iide). 2 - space You will need too: 1 - RunOut - Seor (with wheel) : 2 - 608 bearing (most commonly available bearing, used for skateboard wheels and other things). 2 - M4 x 16mm bolt M4 nut (spare parts of Ender 3). Adjustment of the seor The model has a long trench itead of bolt holes so you can adjust the endstop heigh. This way you can eure it always remai open when there is no filament.