Here's a quickie. Turn any gallon jug into an easy-pour using standard inserts used for alcohol or oils etc. I created it for my plant food water for my indoor plants. Again, this was designed and printed for PLA. If you print ABS you should bump the size by 1 oe 2 percent to allow for shrinkage. It's a very clean fit.
EasyPourAdapter.stl | 412.9KB |