It's an SD Card Holder designed to bolt onto a 1010 style T-Slot. Solidworks file included.
Is it overkill? Absolutely! :)
I printed this using 1 extra shell, 0.2 mm layers, 20% infill, no raft or supports.
I also used a 1/4" diameter x 1/2" long bolt with washer and standard T-Slot eco-nut.