3D-printed threads can be tricky. Sometimes they will stick when you try to use them. Other times, you may have problems with the layers being too thin, resulting in fragile threads that won't hold up.
In this video, Judah Sher covers some of his favorite tips for 3D-printed threads. He discusses tips in SOLIDWORKS for more robust thread design. He also discusses bringing the part into GrabCAD Print before using some tricks from injection molding for the perfect thread.