T Slot Nut
thingiverse
I made this to hold a M4 nut that is in my Ender 3. The nut is exactly 7mm flat side to flat side You press the nut into the back, and then slide it in anywhere on your rails for your ender Note: This holder does not fit "loosely" in the slot, but can be pressed to wherever you need to it go with ease. The nut is nice, snug, and secure
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