Please check the file list and Unzip 'Individual_segments.zip' as provided. they are still didn't oriented to ground but it didn't have pre built supports for FDM printers.
i dont' know SLS product's strength but this ball design did not have tolerance between the ball and the sokets as it supposed to reley on elasticity of fliament matrials as well the ball supposed to be pressed in the soket. in simple, this serpents designed for FDM matrials in mind which is kind of my printer.
last, i add the file Tung without supports and Tail end tips 01 without support and re-oriented.