Hanger for JBL Flip 4 Speaker

**Update:** (22 May 19) I printed two sets in PETG and brought my speakers on the last trip. The brackets did their job. I think I need to buy more speakers, though, as two weren't quite loud enough. :)

I have an annual bus trip with a group, for which the last two or three were on a bus with no Bluetooth or even an auxiliary line-in jack. I scored a deal on a couple of JBL Flip 4s recently and figured they'd be ideal for this trip...but there's no provision for hanging them from the overh