This is simple holder for xt-30 connectors which I decided to use for 12V distribution for my Tarantula. There are two versions of thing. One where you can just press connector and it is tight enough to hold it in place. Second with more offset (0.15 per side), so you can use glue to fix connector.
As requested, xt-60 version added. Not sure how it fits, as I never printed it.