I am experimenting with several ideas for expansion cards and I thought some of you might be interested. I have a rough expansion for an Adafruit QT Py RP2040, a foot extension that increases the height of the back of the laptop, and a dongle hider card. The QT Py expansion is basically just a custom short USB cable and mounting for the PCBs, yes the USB connectors are held in with hot glue, I am not proud of it but it provided a convenient solution.
Next The foot extension is designed to fit around the existing rubber foot and be held in place by the rear two card slots. To remove the extension you just have to slide out at least one of the two locking cards. The long foot won’t fit onto my print bed so it is split in half with a 3mm hole for m3 rod to provide extra rigidity after gluing the halves together.
The dongle hider is pretty simple, it is specifically designed for a Logitech unify nano receiver (model c-u0012) and is basically just a notch to let the dongle sit flat and keep it from sliding. Presently I haven’t decided wether or not I want to further secure the dongle, it seems relatively secure, so for now, I am going to leave it. Also a quick shout out to whoever posted a link to these low profile USB a-c adapters, I can’t find the post but they made my life way easier, so thanks.
I have included a dongle hider/foot mount combo card if you want to do both at once.
Here is a link to the 3mf files, if anybody wants another file format (f3d, step, etc.) let me know and I can add them.
edit: added a loft to the foot smoothing a rough edge