ANDERSON — Fifteen-year-old Carlos Green-Torres of Williamston sat at a booth at the Anderson Farmers Market on a recent Saturday ready to sell his 3-D-printed toys, gadgets and Christmas ornaments.

A price sheet — ranging from $5 to $50 — made clear what he expected customers to pay. Prices, he explained, were based on the time it took to print the tchotchkes , the cost of materials, and some of the cost of the original 3-D printer, which he got for Christmas last year. Asked whether he would ever consider changing the price depending on the customer, Torres paused.

His dad, Edward Green, chimed in.

"You wouldn't charge somone more just because they drive a nice car, would you?" he asked Carlos.

"No. Everyone is equal," his son answered.

Clemson assistant professor Chris Flathmann

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