My second-grade son is entering his Science Fair, and needs a cart for the soda bottle rocket he's making.

I pulled my Corel Draw skills together to come up with a (simple?) wheel and cart-body design to  build and use for the project.

Here are the drawings and project pieces I designed at TechShop in San Jose.

Including the free metal rod, the total cost was about fifteen cents!

Step 1: Check Out the File - built for 1/4" MDF...

Here're the vectors and (not necessarily needed) text for the wheels, brackets, etc.  

I promise the wheels aren't perfect!  I recognized afterwards that I'd set some of the vent holes off-center - but this is not so critical for the project.

It happened that the scrap rod I found for the axles was .188" diameter.  I compensated for the laser kerf a bit and made the holes in the wheels and 'washers' about .188 diameter.  The "axle nuts" are around .186" diameter for the inside.

The drawing has lots of extra stuff - remove as needed.
The 1 cup of vinegar and 2 tbsp of baking soda propelled the cart 131"!!!

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