Fixing primary school classroom equipment

Our 3rd-grade teacher asked if we could repair sun-earth-moon model kit they used in class. Two gears of the device were missing and couldn't be obtained anywhere. So, we designed using OpenSCAD and produced two gears over the weekend and solved the problem. STL model can be found here(Github). Note: The fact that they were manufactured to the DIN 708 standard made things much easier. 

26 teeth spur gears 3d printed from PLA+ (Red ones)

OpenSCAD code to generate spur gears:  

spur_gear (modul=2, tooth_number=26, width=5, bore=8, pressure_angle=20, helix_angle=0, optimized=true);