should cause the plastic wrap to sag slightly such that water that condenses on the plastic wrap rolls down the plastic, towards the washer, and drips into the funnel.
get rid of any large wrinkles that do not flow down to the washer. wrinkles can prevent the condensation from smoothly rolling down to the collection point.
make sure that the funnel in each device is facing up, directly below the washer, and not so high that it is touching the cling wrap. if the funnel is touching the cling wrap, either lower the funnel or raise the cling wrap by taping it higher.
make sure that the modeling clay has sealed the holes 