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tarmo4 open diff spider gears, with axle options
open diff spider gears 3D printed for tarmo4Miniatures
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spider gears made up from openscad script https://www.thingiverse.com/thing:1588376, measurements taken from photos of gears, and revised after printing tests
still working on this, but now these gears do mesh pretty well now, but I do not yet have the bearings to be able to fix the parts, and so cannot proceed to revise further - at the moment consider that this will NOT work with 3D printed gears, as are very small and there is too much friction for such tiny parts (at least in PLA) to take the heat buildup - I will try printing in armadillo and CF nylon once car is up and running ;-)
spider axle gear is provided with 2 separate axles (3mm hole as original, and 2mm hole as I have a 1.75mm paperclip) - IMPORTANT: on importing in your slicer program, make sure Autocentering is OFF, then group the axle only and spider gear axle before moving, otherwise you will lose the origines between these 2 parts - also, depending on your slicer, you may need to separate surfaces, heal mesh, or whatever, as there are 2 volumens intersecting together and some slicers don't like that and will print air if not previously indicated
part 14A was also adjusted, 0.5mm more on inside, 0.5mm more on outside, as there was about 1mm play on this side of the diff that prevented correct meshing, and also from the original plans seemed to requiere 0.5mm more on this bell to correctly align with gearbox housing 03A
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