I have several automatic drinking troughs/waterers (https://shorturl.at/fKMTV) for my pets and livestock and most of them fail when the floater becomes brittle, cracks and sinks. I couldn't find replacements easily so I designed one so I can replace them whenever I need one. There is two versions, one that requires a taper tool for the shaft and one with a shaft attached (6mm). I suggest you use PETG with several walls.