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I use MK Aluminium Profiles made in Germany and the inside track is square. So some of the t-nuts here wouldn't work. Also I wanted something that self centers when tightening and can be inserted even if the ends of the profile are closed up.
The "T-Nuts" use regular M4 & M5 nuts pressed in and are 10mm wide. The angles are at 45 degrees which means that as you tighten it its pushes against the sides forcing the screw in the middle of the opening.
The nut goes on the bottom as seen in the picture, and the screw cannot be much longer then the t-nut since it will push against the bottom of the profile track.
The thickness of the t-nut is 7mm. I made it almost as thich as the depth of the track so I have more plastic on top when tightening, especially since the nuts are recessed in the plastic. I could shave off a mill or two eventually. Otherwise if you use the proper length screw so as to not tighten against the bottom of the track the t-nuts will self align and lock in place.
Best thing is you can just pop them in the track without needing to slide them in from one end of another.
I printed mine 100% infill to give it more strength.
Let me know how it works out and if you need any changes to it.
Self Aligning T-Nuts M4 and M5 by DanLuc is licensed under the Creative Commons - Attribution license.
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