if put so match work in this model pleas boost me or like the model.

This model is made to show you how a double helical gear works and why it is used in advanced machines and cars.

So when you have printed the model you need to look that the 2 gears fit in eachoder and then you can try to push them down or up it wont move and thats because you have 2 arrow shaped pieces fitted in eachoder.