Use this bucket rack to drain from one bucket into another. Often used for draining honey.

Thanks to BalinTech for the 5 gallon bucket STL. I used that to tweak my design and test the parts in 3D for fit.

https://www.thingiverse.com/thing:1938002

Added left and right frame brackets for buckets with narrow rims at the top of the bucket so that the fit is tighter against the bucket. Use 'Frame Left - thin rim.stl' and 'Frame Right - thin rim.stl' if your bucket's rim edge is thinner than show in my pictures (about 2x bucket wall thickness). My original brackets were sized for a bucket rim that is 5-6x bucket wall thickness.