My feeders are designed differently for BFs and HBs. Since the BFs can't hover like the birds do, their feeders have a horizontal feeding surface and a place for fruit. The hummers on the other hand can use the BFs feeders, but I hang them only about 5' apart so the kinda just naturally go for the HB feeder.

last year when I saw a hummer in late June, I put my feeder back up. The hummer left a day or two later but I kept seeing this one Polydamas coming to the feeder to nectar. Now I have lots of plants but just one liked to feed from the hummer feeder, so I left it up for a few days. I am assuming it was the same butterfly since I never saw two around it at the same time.

I don't have butterfly feeders, just hummer feeders, but I get lots of butterflies because of my host plants in the woods and herb graden (spicebush, tulip poplar, parsley, milkweed, and fennel) and because of the flowering plants I use. If I can I always try to find nectar sources that work for both hummers and butterflies. Some good plants I've found for this are agatasche, salvia, ascelpias, vitex, clerodendron, nepeta, pentas, and verbena bonaresis. These are all low maintenance plants for me too (although the pentas are annuals for me). So the plants themselves act as "dual feeders" for me...and that just means I need to spend time out in the garden to enjoy the visitors they bring! =) Win-win.