The Mason Jar Candy machine by Carl Belcher receives the jar, but is super tippy (since the inside isn't threaded, just smooth). I just whipped up a ring to make out of TPU that holds the mason jar in place firmly.

The mason jar candy machine:
https://makerworld.com/en/models/27122#profileId-23564

Default settings, Generic TPU - a little brim on the inside will grab the lip even better.