Although the H2D printer's hotend has a similar structure to that of the A1 series, they are not perfectly identical.

The H2D hotends are specifically designed for that model, offering maximum compatibility. For example, they support a higher maximum volumetric flow rate, reduce the risk of clogging, and allow for more precise nozzle offset calibration between the left and right hotends. They also enable automatic hotend type recognition via the real-time camera.

Therefore, to ensure optimal print quality, it is strongly recommended not to use A1 hotends on the H2D printer.

You can use H2D hotends on A1 series printers, but you must also use the H2D-specific silicone sock for proper compatibility.