Double blower fan adapter
thingiverse
Lets you adapt any 40mm flat fan mount to accept two 50x15mm (laptop style) blower fans. Fans press fit into adapter and I have been printing with them for over 75 hrs without them coming lose. The ducts are canted at 7° to allow adequate air flow to the left fan. You will need 4 M3*20 screws to mount the adapter to just about any 40mm fan duct without having to edit or re-engineer the item.
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