I had a leak coming from the garbage disposal and I found it leaking from the output drain of the disposal to the P Trap. I picked up everbilt 1000-049-738 1-1/2" Slip Joint Nut and washer kit and modeled the nut. Then when messing with firmware one my printer I needed something to print so I did. The threads look right, the hole is a little large but probably would work since you need a washer anyway.
I still used the everbilt slip joint nut and washer and 6" extension which also came with a slip joint nut and washer. If I was going to use the printed I would have went with more shells and higher infill. The part feels solid and I'm pretty sure it would work fine.