These printed corners snap onto the M3 nut.
ABS will soften at elevated temperatures therefore I doubt the press fit will last a lifetime when printing at bed temperatures of 100+.
You can use simple superglue (cyanoacrylate) which is temperature resistant to bond the part to the bed. Works like a charm for me.
Don't use too much glue that it oozes out and leaks onto your printer, small droplet will suffice.
The author marked this model as their own original creation.