Raspberry pi 4 heatsink stabiliser/protector

thingiverse

Milled an old Pentium heatsink to cool my Pi and was worried it might short something out, so I made this little guard to provide a more stable platform around the CPU. Added assorted holes around it to clear the tiny surface mount components around the CPU, ensuring that it touches nothing but the PCB. The total thickness is designed to be 2.4mm, which is just slightly thicker than the CPU's 2.5mm thickness. My print came out at 2.49mm anyway. Let me know if you want a thinner one; I was considering it so I could put some adhesive foam under it, but I don't think it's needed. The version marked with "lip" is to suit the heatsink I have and ensure that it won't touch the GPIO header pins. I added the modified case top I used with a large hole so the heatsink sits through it. I used a mill, but there are only cutouts that could be done with a hacksaw. This heatsink was 60mm x approximately 55mm; one fin was taller than the others, and I cut it away entirely with a hacksaw to make the heatsink 60mm x 48.6mm. Then, I made a small cutaway in one corner to clear the 4-pin J14 PoE header, which is about 8.2 x 8.8mm. Next, I made a larger cutaway to clear the camera header and 3.5mm jack, which is around 22mm square. A 4-thread sysbench test peaks temperature at 62C with this heatsink, so there's no need for a fan.