M3 T-Slot Insert for 2020 extrusions w. 5 mm slots

In the middle of my delta printer build (custom variant of the Mini Kossel) I realized that I was running out of t-slot inserts. Looking to buy some I either had to pay way too much for the delivery, or buy them from China and wait for 2 weeks. No fun. What I do have a lot of are common nuts and washers, so I made my own inserts instead. Works like a charm! The M3 nut and M4 washer (dia. 8.9mm) snaps right in and takes all of the axial load, the printed parts just makes the insert easy to mount