I have updated this thing to remove the full positioning rail in the center. When using T-nuts, they made contact with the rail and caused issues.
I wanted something fast and easy to print that would hold a Pi 2/3 to the extrusion using standard M4 T-nuts. Used supports touching the build plate to provide support. Designed to hold standard M2.5 nuts on the back side to hold the Pi in place. M4X8 button head fasteners are used to hold the mount to the rail (10mm is too long and will contact the extrusion).
I might modify it to allow access to the SD card, but I believe the spacers designed into the mount should allow enough access to get the card in and out.
Printed in PLA
Uses M4X8 and T-nuts to mount to extrusion
Pi uses M2.5 and M2.5 nuts