In the Anet A6 kit the 40mm fan is bolted against the cooling rib to keep the filament assembly drive together. This is done without no support for the fan.
I made this spacer/standoff design to give proper support for the 40mm cooling fan and make the assembly more rigid. To make assembly easier the two spacers is interconnected with a bridge with correct spacing, just insert it into the cooling rib as shown on the photos.
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