This is good for bottom filling molds with resin. You can make the perfect size nozzle to reach the bottom of your mold. Extract the funnel as the mold fills to reduce air bubbles. I've included several variations that you can print and use immediately. If these don't suit your needs I've also included the OpenSCAN for you to tinker with or use with Makerbot Customizer.
Try it in Customizer, it is really easy, I promise.
NOT FOOD SAFE. Please, not for use in food preparation. I don't want anyone getting sick.