Drop in T-slot Wingnut
thingiverse
I designed this adapter because I had a surplus of drop-in t-slot nuts and no regular nuts were available. The M5 nut pictured is the one I used, but I haven't tried using M3 or M4 yet, although they should work just as well. You may need to increase your slicer's scale to 101% for it to fit properly - even with some extra space added in Blender, it was a very snug fit. I printed this adapter with Cura at an 86% flow rate, 100% scale, and 20% infill. I always use an 86% flow rate on my small prints because it's the sweet spot for my printer.
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