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Tiny AVR Programmer - Two ISP headers to use with other AVR microcontrollers - Plugs directly into USB port: Attiny: Amazon.com: Industrial & Scientific
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USB AVRISP XPII, AVR Programmer - RobotShop
Amazon.com: USBasp Programmer Downloader Bootloader Flashing Kit for 51 AVR USB ISP ASP Microcontroller Compatible with Ender 3 Pro cr10 CR-10 3D Printer : Electronics