Any form of glue specifically designed to weld with polylactic acid will unsurprisingly(!) work really well.
EMA plastic glue is designed for PLA, various places sell it in a nice bottle and give it their brand name and charge large amounts for it (gloop) but you can go find really cheap alternatives anywhere by searching “EMA Glue” and just get the cheapest one you can find - It bonds with the plastic, if you can seperate them after it’s dried with your hands you should be wearing a cape