let's see:
diamond disk: 1$
DC motor: 1-3$
switch: 1$
some Al or plastic support, with minimum of machining: 2-3$
Total components cost: under 10$
Then why it's 50$ ?!
The "hardest to find" component is the diamond disk... Set of 5 20mm Mini Diamond Cutting Discs for DIY, Silver Smithery and Crafts | Virtual Village - US


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