This is a RAMPS slide-in holder which allows for simple mounting of the Arduino / RAMPS / Pololu carrier boards / fan stack on the underside of the Delta-Pi plywood or MDF base. The RAMPS stack slides in the holder and stays firmly locked in place. The last two pictures above show how I am using it for my Delta-Pi. The design is a remix of my earlier P3Steel slide-in RAMPS holder, which I modified to use wood screws. OpenSCAD source code is included so the part can be further remixed if needed.Here printed in blue PLA, but can also be printed in ABS. Easy to print (no bridges and only a small overhang). Requires 4 wood screws to mount on any wooden surface.