Tandem Mobi Alignment Disk

Was annoyed by my insulin pump sliding off the charger any time it vibrated. I had seen a couple of other models designed for this, but most of them had the cutout for the pump centered. I've always had an easier time getting the pump to charge ligning up the logos, as Tandem recommends. So I made this alignment disk to hold the pump in the proper position.

Hope someone besides me finds this useful!