I don’t think it would be difficult to add a hopper to this design - just make it so they all go in the slot one at a time. Jamming would likely be a problem if too many coins were added at the same time, but that’s something you could probably fix with a little shaking.
I actually was looking for a simple coin sorter the other day on Amazon and couldn’t find anything reasonably priced that would allow me to throw a handful of change in and have it get sorted. Seems like there are only bulky $30ish options for automatic (battery powered) coin sorting, or simpler options that require much more manual labor. I might actually try to build this thing (and add a hopper) since it fits my budget and needs nicely. I’ll have to get a hot glue gun though, but I guess it’s always good to have one of those for crafts projects anyway.
