Expanded Bambu Lab H2D Riser with Integrated Third Extruder. Supports TPU filament input and printing. Created by Wei Ge

The H2D's default dual-feed system does not directly support TPU filament input and printing, so I designed this riser with a built-in feed path.

While providing ample space for Teflon tubing curvature, an additional universal feed port is added to the rear, enabling normal TPU filament input and printing.

The design also incorporates the upper cover vent's operation; a recessed shape facilitates ventilation without impeding cover opening and closing.

When printing TPU, simply remove the upper built-in Teflon tube and insert it into the riser's feed port connector to utilize the right-side nozzle for flawless TPU filament printing.

Although the H2D has a rear central hole for Teflon tube access, filament installation and removal are highly inconvenient, especially if your printer is close to a wall and lacks side space for rear operations.

Testing confirms successful TPU 95A filament printing using this feed port; other filament hardnesses should also work, though experimentation is recommended.

Since this requires a glass cover, confirm your filament's shrinkage rate before printing, keeping dimensional errors below 0.1%.

Because the H2D features heated chamber functionality, filaments with a heat deflection temperature below 65°C are not advised; I utilized PETG-CF.

The model's substantial size necessitates H2D printing.

Required accessories:

Two PC4-M6 straight pneumatic connectors

One 2.5mm inner/4mm outer diameter Teflon tube, 225mm

Twelve M3x30 countersunk socket head cap screws

Four M3x20 countersunk socket head cap screws

Sixteen M3 hex nuts