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Plz Halp
(1)Make sure your gears are lined up first of all. If one of the nylon spacers is contacting a gear on a different axle then it can push the gears away from each other just enough so that they can’t mesh.
(2)Try and put a STRAIGHT piece of one bar(with bearing blocks) along the middle of the two axles that have the non-meshing gears; this will ensure that the axles can’t slip away from each other causing the slippage that you’re getting.
Hope this helps and hopefully you can figure out what’s wrong
Thanks, I think I found the problem