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V4 of the base doesn't appear to have any holes to mount the 404010mm stock hotend fan?

I've printed and will drill and tap holes for mine but suspect that this wasn't intentional?

I'm also jerry-rigging a 6025 fan I salvaged from an old printer as I don't have a 5015 but the mounting hole in the bottom of the base appears to work fine - will duct tape it for now and print an adaptor once I know the dimensions and relative position of the fan outlet and the duct inlet.

This is a great looking duct which maximises the view of the nozzle, something other ducts resolutely fail to do.