I have uploaded an improved (stronger) remix of this here: https://www.thingiverse.com/thing:3119518

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For me at least, the thread on the original is way too slack – I could push the two halves together rather than screw them together, so this is a tweaked version with the inner thread larger by 1mm diameter (so +0.5mm radius).

Still very much JamieLaing's design, just tweaked slightly. Printed at Seaside 3D, UK. www.seaside3d.com