Velcro strap base

It's just like those self-adhesive zip-tie bases, but with a half-inch wide slot for Velcro One-Wrap strap. Use whatever double-sided adhesive is handy, I'm using Nano Tape but VHB is great too.

Assuming your printer does a halfway decent job with bridging, this prints flat with no supports, in about ten minutes per piece. The chamfers are weird and stupid but IDC because it's quick and dirty and it works as-is. I might redraw it later and make it pretty.