My bad,  I ignored the different thread angles, but for a thread to engage, the thread angle has far less impact than the correct pitch - it is of course completely wrong from an engineering perspective - but fixing a toy and breathing new life into it is more rewarding, even if the sloppy fit results in premature failure, because we can always make another.. None of the threads I use precisely conform to the standards in terms of tip and root radii and FDM processes will never give a true thread form, cutting threads and gears to conform to the standards is a whole new artform, [having working in a gear machining shop in the early 80's].  Stuff we take for granted in every automotive gearbox.