Fully 3d printed open differential for Tarmo4.
My version is strong enough and easy to print. You need 2x M3x10 tapered head screws and 4x  cutted to 8mm M3 screws.   
https://www.thingiverse.com/thing:4178625

Tarmo4 Open Differential

14B_Open_Diff_Crown.stl

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Tarmo4 Open Differential