Math Gear(s)-Enhanced

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NEW VERSION ALERT!!! With Braille Numbers & Easy-to-Feel Direction Indicators! ALL Gears Revised for Easier Assembly, Better Fit, Smoother Operation! This Math Manipulative is Designed to be Playful from the First Touch. It Lies Flat on Desk Top, Making it Perfect for Overhead Projection Systems. Behind the Mechanical Fun, Several Simple Ratio Exercises await. The Eight-Tooth "Idler" Gear is Supplied to Add Reverse Rotation without Affecting Ratios. Each Interchangeable Gear Has Built-In Graphics Indicating Number of Teeth and Rotation Position. Braille Numbers Ensure Accessibility for Those with Impaired Vision. Gear Ratio Formulas can be Found Here: http://en.wikipedia.org/wiki/Gear_ratio Rubber Bands Provide Tension, Keeping Wheels Engaged Regardless of Combination. Note: The "T" on the 16-Tooth Gear Stands for "Teeth". INSTRUCTIONS: This Design Prints Well on All Machines, Including Small Ones. All Parts Fit within a 105 mm x 105 mm Build Area. No Support or Raft is Needed. Clean-up Should be Minimal. Assembly is Simple; Just Refer to Photos Provided. Rubber Bands are Standard Office Supplies (3/4" or 1"). The Idler Gear May Require Some Effort to Free, but Simply Break it Loose and Spin it a Few Times. The Axle Post is Now a Snap-Fit into the Center Hole of the Base Unit, Making it Easy to Add or Remove as Needed. Clean Out Center Holes in Gears After Printing for Smooth Operation. Have Fun Learning!