I didn't have any spare t nuts handy for a magnetic spatula holder I'm making so quickly made one using the ones included with the Ender 3 Pro as a base. 

I also included a screw I made but it is a standard M5x0.8mm thread in the nut. And anyway it's not hard to make one suited to your needed length.

Not sure about printing threads with FDM but I printed mine in resin in case that's relevant.