Here's a set of files that work with the Feather-compatible Argon and Xenon (Boron compatibility hasn't been tested). Argon: There is a cutout in the back of the case for the Argon's Wifi antenna (fish it through and connect before enclosing). Magnetic cover: There is a cover with slots cutout for a badge magnet, so that the headers can be exposed on the bottom for free-wiring. Magnets: A compatible badge magnet can be found here: https://smile.amazon.com/totalElement-Magnetic-Fastener-Adhesive-10-Pack/dp/B00EHK287M Put the badge magnet in, and place the retainer bar into the two slots (flip for compatibility between different badge magnet styles). This is a derivative of this case, if more pictures help (this one does not support a battery on the side): https://www.thingiverse.com/thing:2749893