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I buy super cheap slingshot balls from Princess Auto. You could use Ball Bearings, too. kinda expensive though.

If you make a few, post pictures here! Fire me an email at stu@stumitchell.org

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Start spreading wood glue.
THIN layers are best. Push onto base and wiggle them a bit.

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Scroll saws are awesome. About 150$ each and can be used for SO many projects. See the section on setting up shop.

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1/4" plywood cut into 3/4" wide strips is a good wall material. A friend at a local High School might cut them. I also see strips of wood pre-cut at Hardware stores. Get the kids to use a pencil, mark the wood lengths and cut with a scroll saw or handsaw.

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Flip the wood over, line up the pin holes and drill through. This is a good way to get a really clean hole.

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I use a drill press with a 7/16" Forstner bit. A spade bit will work, too. A hand drill will work as well. Only drill until the drill center pin pops through.

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I use cheap 1/2" thick MDF cut to the size of paper (8.5x11). Some plywood supply places will cut the wood for a small fee.
Tape one edge of the grid paper to the wood, put some carbon paper under (black side down) and trace through the drawing with a pencil!

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I use 1/4 grid that I print from the web than photocopy. The walls are one square wide. Keep minimum 3 squares between the INSIDE of walls. Holes are 4 squares. Avoid diagonal walls.. (tricky to build

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Holes are about the size of a dime. Add enough to be challenging but not Swiss Cheese. :-)

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Decide on a start and finish and draw a path. Try to use the whole page, keeping a Two Finger gap between lines. Once you have a path, draw walls. This is a great time to talk about DESIGN and how it relates to function. Most kids go super complicated, so it is a perfect time to discuss construction and capability!