lion mclionheadThe best 3D printed heat sink is made of PETG filled with copper filings to get it to conduct heat. The only brand was kexcelled petg which is no longer produced. The best solution nowadays is copper filled PLA at $50 for a tiny amount.
https://www.matterhackers.com/store/l/proto-pasta-copper-composite-htpla-05kg/sk/M0FYXMW3
Another idea which might work is making thin walled PETG filled with thermal paste. Thermal paste is more expensive than copper PLA.
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