Drop-in M4 T-slot nut with male connection for 80/20 Aluminum Extrusion
thingiverse
I needed a magnet under my top bar and these t-nuts seemed great but the magnets I already had on hand (https://smile.amazon.com/gp/product/B08K352MRM) needed a 4mm male threaded connection to them. I added an M4 threaded "bolt" to this design and it works great. I did add a washer between the magnet and the nut. Also, the threads are so small, you will want to print these at .1 resolution if possible. No supports were needed on mine, but I did use a brim since its so small.
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