MiniMoto Educational Drivetrain V1

(Competition Edition)

A compact, fully functional educational drivetrain designed to demonstrate how power travels from the engine to the wheels.

This model was designed for the "Keeping Busy - Toys & Projects" contest as a hands-on teaching tool that lets you see the internal workings of a vehicle drivetrain instead of hiding everything inside a transmission case.

The assembly includes a working engine, selectable transmission, driveshaft, open differential, and rear axle. Every major component is removable, making it easy to understand how each system works individually and how they work together as a complete drivetrain.

Whether you're learning about gear ratios, differential operation, or simply enjoy mechanical engineering, this model was built to make those concepts easy to visualize.

As a bonus, assembling small mechanical models can be a relaxing way to focus your attention and take your mind off the day... unless you're fighting with a stubborn 3D printer.

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Apology

I messed up. In my frantic rush to finish this model before the contest closed, I made the holes on the engine frame too big or too small the axles could slip out of the holes, and the control shaft wouldn't fit. This has since been fixed in a new file labeled "Frame_Fixed", but I had to delete the original model, already uploaded (and downloaded by 5 people) so I could add them. If you see double, this is the right one.

I apologize for any confusion this caused and can only hope that you will be understanding of my situation.

If you catch any more mistake I made, Please write a comment, I will try my best to fix them.

Thank you.

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Features

• Working inline engine

• Selectable transmission with multiple gear ratios

• Functional open differential

• Rear axle and wheel assembly

• Modular design for easy assembly and maintenance

• Designed for education, demonstration, and display

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Parts Included

• Main Frame

• Front Axle

• Rear Axles

• Engine Frame

• Crankshaft

• Connecting Rods (x4)

• Piston Heads (x4)

• Transmission Control Shaft

• Transmission Frame

• Transmission High and Low Gears

• Transmission Power Shaft

• Transmission Shift Collar

• Transmission Transition Gear

• Ring Gear

• Spider Gears

• Wheels (x4)

• Tires (x4)

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Hardware Required

None.

The model is designed to assemble entirely from printed parts.

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Assembly Notes

Most components use snap-fit / press-fit features designed to simplify assembly and reduce the need for hardware.

(Glue may be required)

Take your time during assembly and test-fit moving parts before fully snapping components together. Depending on your printer's tolerances, light sanding or minor cleanup may improve the fit of gears and shafts.

Tires and Rims are included but not required.

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Design Notes

This project was designed to be both educational and enjoyable to assemble.

Rather than hiding the drivetrain inside a solid body, the frame intentionally leaves the moving parts exposed so the complete path of power can be followed from the engine, through the transmission, into the differential, and finally to the wheels.

The goal was not to create a scale vehicle, but to create an interactive model that makes mechanical concepts easy to see, understand, and demonstrate.

Future Versions

Possible future improvements include:

• Larger chassis

• Suspension

• Steering

• Additional gear ratios

• Improved engine detail

• A boxer engine

• More realistic vehicle layout

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Feedback

If you print this model, I'd love to hear how it went!

If you have suggestions, discover a bug, or come up with an improvement, please leave a comment (and maybe a remix). Your feedback will help make future versions even better and will help MiniMoto_Lab continue creating educational mechanical models for the community.

Thanks for downloading, and happy printing!