I could see this being done with a multi-legged mount with foam ends sitting in low friction guide tubes (lube?) inside the build tank. That way as the water raised it would also raise the printer evenly (once the printers weight is overcome by the legs buoyancy). Since the mounts and tanks are not in the $100 version i'd be surprised if someone doesn't try this in their custom build TBH. Maybe one of the beta's can give it a shot ;-). Seems like a pretty cool idea to me Synchron.