Extension to Ramps 1.4 Size: 3X1.5X1.00 cm material: PCB, maximum voltage: 20V, PWM control current (D6 / D11), maximum current: 0.5A, you can connect a fan with PRD to support the output voltage (5V / 12V / more) supports Marlin software, easy assembly. https://elecena.pl/product/22622619/fan-expansion-module-for-ramps-v1-4 2023-02-23 https://elecena.pl/product/22622619/fan-expansion-module-for-ramps-v1-4 2025-10-28