-

Yes. The left and right hotends are identical in structure and materials, so they can be used interchangeably.

The H2D printer supports up to 4 AMS 2 Pro units and 8 AMS HT units connected simultaneously, for a total of 12 units and 24 material slots.

Since the H2D is equipped with two hotends, in the most extreme scenario, all AMS units can be connected to one hotend, while the other uses an external spool holder.

With this setup, the printer can support and print with up to 25 colors.

The first-generation AMS system is fully plug-and-play compatible and can be used with the H2D printer for multi-color printing. However, its drying function is not supported.

Due to fundamental differences in the loading mechanism and buffer structure, the H2D printer does not support the AMS Lite system.

The two 4-pin ports on the back are intended for future expansion accessories.

For example, to upgrade a non-laser version of the printer to the laser version, one of these ports can be used to connect an external air pump.

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.

No, a USB flash drive is not included by default.

You can still start prints normally without a USB drive, as the printer has built-in storage for executing print files.

However, the absence of a USB drive affects the following features:

Time-lapse recording and photo capture cannot be enabled.

Printing via LAN is not possible.

Sending print files to the printer for storage through the project interface is disabled.

Log file export is not supported.

USB Requirements:

USB 2.0 or higher protocol

Minimum write speed: over 10 MB/s

Supported file systems: FAT32 and exFAT

Only one USB drive is supported; USB hubs or multiple drives are not compatible.

The hotend used for printing is determined during the slicing process of the model file.

For preloaded models, the correct hotend is already selected at this stage, so it cannot be changed directly from the printer’s screen.

When slicing a file in Bambu Studio and sending it to the printer, you can choose to use the left or right hotend.

For certain materials, such as TPU and PPS/PPA-CF, it is recommended to use specific hotends for optimal print quality.

For more information on filament compatibility with the H2D printer, please refer to the corresponding wiki page.