These work great! Just fill with cooking oil up to about half inch to the inside riser and your ready to go. No more ants messing up your feeders. It prints with an 1/8 inch hole all the way thru, which makes cutting 5 inches of coat hanger to press right in. Mine was a bit tight but that's what i wanted. If your's is loose fitting you may want to fill the gap so ants can't get down through the hole. 5 inched leaves for about 1/2 inch hook, you can make yours longer if like. Depends on how you plan to hang the feeder. Also just make a tiny bind in wire towards the bottom to keep the oil bowl from sliding all the way down. I printed mine with only 2 layers and 20% fill and then painted with acrylic hobby paint and they are working great. PLA plastic. Hope you enjoy, it's that time of year when hummers are real active and ants everywhere. Thanks, Rick. UPDATE: Paint at least two coats of paint and if you have oil base paint i think it will do even better. Mine last summer want to seep out a little. I need to get mine in from this years winter! Been out there the whole season of cold weather. Hasn't hurt it, though need to get it ready for this spring. Have fun, and happy hummer season, when it gets here. :)