This is the remix of Squishy Turtle by Jacob Stanton (link to the original).
This model has compatible top and head with the original models. I also added screw threading in case the original H-clip warped out (which happened to my PLA prints). For assembly with screw, all components are included in this model, although if you prefer the original H-clip assembly, use the bottom and the clip from the original link.
Support shouldn't be needed, although you might need one under the chimney right on top of the head. Thread tolerance is modeled at 0.15mm. It worked fine with layer height at 0.20mm for Prusa Mini with Plusament PLA.
Head's shape is a bit wonky (as I'm still learning modeling) ..but I'll say it's a charming feature to add something organic to this machine-organism.
Update V2: Made tail more accessible, and tweaked a few minor details (slightly thicker chimney, roof protrusion towards front side, etc)