Alfawise U20/U30 Fan Insert for 5mm LEDs
thingiverse
This is a compact 3mm device meant to be placed between a 4cm fan and a red plate, replacing traditional white spacers. The precise DC converter employed was sourced from https://www.aliexpress.com/item/Power-Supply-Module-Replace-LM2596s-Mini-3A-DC-DC-Converter-Adjustable-Step-down-Power-Module-Hot/32955086004.html, however a similar model with all wires on one side can be adapted for use. Designed to accommodate two 5mm LEDs, this module offers a versatile solution for various applications. To minimize noise, consider connecting your 3cm fan directly to the output of this DC-DC converter.
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