30.5x30.5mm (M3) to 20x20mm (M2) adapter for freestyle quad

thingiverse

When my readily available, 3D-printed adapter failed, I decided to design a new one and make it more robust. The part is designed in the direction it needs to fit into the quad, but it must be printed upside down to avoid needing support under the recessed areas. Update: I created the original part with recesses suitable for my drone design, but as I realized this wouldn't work for every application, I also made a simple, flat version that's 2mm thinner. This new design is stronger than the original part and most slicers can scale it in the Z-direction if you want a different thickness. This simpler part doesn't need to be flipped for printing. I recommend printing with a stronger filament than ordinary PLA. When a quad hits the ground, the impact will also affect the electronics stack.