This is a simple print that I made so the detergent didn't need to be moved to fill up the cup, and there is a tray piece to keep any drips off the counter surface.

Most of the liquid detergent bottles have the same basic shape on the bottom face (even if the upper part is wider for a really big one) so it should work for most sizes and brands.

I had planned to cut out some rubber feet for it, but ended up not needed to. If you place on top of a washer though it probably would need some grippy feet.