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Core77 - Blog • Feb. 9, 2026, 4:15 p.m.
A Clever, Low-Tech, No-Robots Design for a Passive Tennis Partner
A clever inventor named Ulpan Dimas invented this CourtSense Tennis Rebounder . Unlike the ball-volleying robots now on the market, Dimas' low-tech invention requires no electricity and no tennis court: Dimas sells the CourtSense for $295 on eBay (plus shipping, and be aware that Dimas is in Indonesia).
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