Corner Bracket (3-way) for 20mm standard extrusion profile

You can find dozens of corner (3-way) brackets on Thingiverse. Unfortunately my printer (DX-U649 ifancybox) has a unusual gantry, that sticks over the 20mm extrusion profile. So i had to make my own (again *sigh*).

It should be a very tight fit with some sanding required. One should be able to slide them over the corner where the extrusion beams meet. Two t-slot nuts should slide under the bracket after installation. In total you need 8 M4x10mm and 8 M4 T-Slot nuts per bracket.