I liked IIan's Gridfinity RPi stand, however, I didn't like the idea of screwing the RPi down to the stand, making it more difficult to remove.

These simple pegs can be glued into each screw hole in IIan's original design using superglue, and then an RPi can be rested on the stand, with the pegs going through the screw holes.

While it won't keep the RPi secure, it is sturdy enough to hold up the RPi if the Gridfinity system is stationary.

I recommend printing with a brim, and elephant's foot compensation enabled (0.1mm in my case). But, if the print fails, you're out less than $0.01 in filament!