Well see how this works. This is an stl 3D print file I whipped up for a single sheet 8x10 tank for developing hanger. It's big and odd looking, maybe absurd. But it works great on X-ray film and Rodinal 1:100. Doesn't take up the space of trays, and no scratching of the film. But I suppose it will do fine for D-23 or other. Takes 800ml of liquid, so that works out to 8ml of Rodinal, which is a bit wasteful, but not too bad. Maybe you could put some sticks or tape aross it and have enough developer capacity to do a 4x5 hanger after the 8x10,before throwing it out. It's kind of skinny, but you can stick a little funnel in it and spread the sides with it a little, to pour the developer in. Can't print this on an Ender 3, but I also have a Neptune 4 Max. Don't drop your thermometer in it because I doubt you can fish it out,when filled. I didn't have the presence of mind to design a thermometer compartment in it, or some sort of on-board funnel. This is what it looks like in Prusa viewer. Somebody please report back if you can download and open the zip file containing the stl.