Printed standing on the tapered thread points with a raft for adhesion.
On my Ender 3 the nut collides with the bolt of one of the guide wheels of the hot-end carriage. While tightening the nut the coupling needs to flex quite a bit. Looks to me like it might break soon. I made a remix with a longer hex part to bring the nut above the bolt.
Also the M10 thread has the wrong pitch (1.05 mm instead of 1 mm), so it needs to be scaled to 95 % along the axis (Z in my case).
Remix to solve the problem can be found here: https://www.thingiverse.com/thing:3455092