The point of these panels is to cover the mess in the rear chamber like the normal panel, but leave the extruder exposed for easy filament loading/unloading. The design includes cutouts for the bowden tube and an umbilical cord. Bottom panel attaches with 4x M38 to the rear extrusions. Top panel attaches with 2x M38 to the rear extrusions & 2x M3*any to top of bed extrusions.