I tried out vertical dipping with the injector, and it actually worked out really well. I was able to dip the tubes without using a lot of excess plastic. When the injector started to get low, I just pushed the injector syringe up and was able to keep going. The downfall is that you can only dip one rod at a time, but for someone who is more concerned about saving plastic versus production quantity, this seems like a decent way to do it.