Diy Gravity Dog Feeder . Trace the pattern of the cutting on the pipe with a marker. Glue the bottom of the servo to a cardboard base. Gravity deer feeder (With images) Gravity deer feeders, Deer feeders from www.pinterest.com That's because this is a standard shelf you can buy for around $24, which was simply cut out to fit some bowls and given a layer of paint. This diy cat automatic cat feeder can hold large quantities of food for many days. When autocomplete results are available use up and down arrows to review and enter to select.