I get worried about setting a set amount of food out like that during the day because of someone on the bottom of the pecking order not being able to get in and get any.
I read somewhere that if you provide feed to the chickens 24/7, they will only eat as much as they need and not much more. If you only feed them a limited amount only once per day, then you train them to stuff in as much food as they can get knowing that there will not be anymore for the rest of the day. Chickens low on the pecking order may get little food in that case.
With that in mind, I have a 24/7 hanging 5 gallon bucket of feed with PVC elbows like someone else posted in a picture. There is some spillage, but not much. When you have a hanging feeder available 24/7, you don't have to worry about the chickens low on the pecking order getting their fair share. At least, I don't worry because most of the time when I open up the coop, there is maybe only 1 chicken at the feeder and there are 4 spots to eat from. So everyone has a chance to eat what they need.
I also feed my chickens whatever kitchen scraps we have. Chickens are omnivores, and I do not hesitate to give them meat product leftovers, fish entrrails, etc.... They eat what they want and the rest gets buried in the deep bedding and turns into compost. I'll clean out the coop in the spring, throw the used bedding out into the chicken run, and let the old bedding compost out there for awhile. I have a cement mixer sifter and sift chicken run compost for the garden as needed.
After the chickens ate all the grass down to dirt in the chicken run, I just covered it with wood chips, grass clippings, and leaves. It makes a nice deep compost in place and the chickens love scratching through it to find bugs and worms. My feed costs in the summer months is less than half of the winter months. But almost all my grass clippings, leaves, weeds, garden scraps, etc... get thrown into the chicken run all summer long.
I will say, however, that I think letting my birds forage for food all day out in the chicken run has reduced their egg production as compared to maybe a chicken on a well balanced commercial feed with restricted access to forage food. Even though I still have a hanging feeder available 24/7 during the summer, my chickens prefer to eat just about any forage food out in the run before eating the commercial feed. I prefer to see my chickens out scratching for food like chickens naturally do then just eating at the feeder. So, it's all good for me.