Summary Very stable corner connector for three 2020 extrusions Great base for any 3D-Printer project up to ~40x40cm size :) It's imho better and definately more precise than the comercial aluminium connectors I used before this. It's much more rigid than you might think! You need usable bridging to print it niceley :) I recommend to print them from good ABS or PETG (tested, works great!) or anything else very stable - PLA ist not recommended, except maybe for small printers. Design is provided by Frank from esuah.net - big THX! Original STEP-File is included Print Settings Printer Brand: Ultimaker Printer: Ultimaker 2 Rafts: No Supports: No Resolution: .3mm Infill: 50% Notes: Recommended Filament: Use PETG, Nylon/PA, good ABS or similar