These are the parts to hold duet 0.8.5 under build platform of the kossel mini with 2020 extrusions. In particular for the base side extrusions of 24cm. It also includes feet to raise the printer above the table and optional rubber shoes (to be printed rubber filament) for the said feet. They make the whole thing much more quiet.I do not have panel due and do not plan to have so I don't know whether it plays along well.Once you have all parts from the BOM, you basically follow your heart and provided pictures to put it all together.