Replacement end cap for Roku Soundbridge M500 and M1000

I love my Roku Soundbridge music players but the end caps that cover the connections are very fragile and prone to breaking off. So lots of owners have Roku players without end caps. I broke one myself recently and realized that it might be possible to print a replacement at home. I found one from @mostlydecaf that was designed for the Roku Soundbridge M2000 so it wouldn't fit my M500 and M1000 players. But it did inspire me to try designing my own. After 6 design revisions in Sketchup Maker, I