you are missing fixing nuts for your aluminum profile? no worries, you can now print M3 nuts embedded blocks for aluminum profile 20 20 ..With Repetier Host (Infill 100% / Layer 0.1) Pause at the last corresponding layer to your nut compartment. Roll Back print head (with the arrows controls only) and then install your nuts directly on the printing plate (see picture) then continue printing ... Nota: For better adhesion of plastic on the screws, put some UHU glue stick on top of the screws once in their compartments.