Turntable coupler in apartment microwave was shot from previous renters. Printed this as a replacement. Added material and radii to base to prevent piece from failing as it did before. Has been working well, this was my first 3D printed part on my Ender 3.

I modeled this from the broken piece with a calipers but it should be a direct replacement for this:
https://www.amazon.com/GE-WB06X10420-Turntable-Coupler/dp/B00ECV59RC/ref=sr_1_3?hvadid=173519481752&hvdev=c&hvlocphy=1021449&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=18391001900496113699&hvtargid=kwd-4962080625&keywords=microwave+turntable+coupler&qid=1556078030&s=gateway&sr=8-3