Bugbu Advanced Toolhead: Bambu TZ, 4028 Cooling & BTT Eddy

Built in the true RepRap spirit of continuous development, this custom toolhead for the Bugbu printer ecosystem is engineered for absolute reliability, precision, and high-speed performance.

This design completely replaces the traditional J-head setup, upgrading to a Bambu X1/P1-style hotend architecture. The primary focus of this toolhead is to deliver consistent extrusion, maximize part cooling airflow, and minimize moving mass to maintain uncompromising print quality at higher speeds.

Key Features

• High-Flow Bambu TZ Hotend: Upgrades the standard J-head to a Bambu X1/P1-style hotend, allowing for higher volumetric flow rates and straightforward maintenance.

• 4028 Part Cooling: Designed to mount a Sunon 4028 fan (PMD1204PQBX-A). Combined with the custom Bugbu TriHorn Duct, it provides the substantial airflow required for high-speed PLA printing and steep overhangs.

• Lightweight BTT Eddy Mount: Utilizes a stripped-down, PCB-only mount for the BTT Eddy probe. This keeps the toolhead mass low while ensuring precise and rapid bed meshing.

• Integrated Extruder & Cutter: Features a direct mount for the Sherpa Mini extruder for reliable filament driving, alongside a built-in filament cutter assembly.

• Built-In Belt Tensioning: Incorporates a streamlined tensioning system directly into the toolhead carriage, allowing for fine, precise belt adjustments simply by tightening an M3 bolt.

Bill of Materials (BOM)

Printed Parts

• 1x Bambu TZ Sherpa Mount

• 1x Bugbu TriHorn Duct

• 1x Toolhead Cooling Adapter

• 1x Carriage XF Block LM08LUU HDz

• 1x Carriage XB Block Type B LM08LUU HDz

• 1x Bu Filament Cutter Assembly

• 1x Sherpa Mini Extruder

Hardware & Electronics

• 1x Bambu TZ Hotend (X1/P1 Style)

• 1x 4028 Part Cooling Fan (all 40mm fans work tho)

• 1x 2510 Fan (Hotend Cooling)

• 2x LM8LUU Long Type Linear Bearings

• BTT Eddy (Bare PCB with the plastic cover removed)

Fasteners

• 4x M3 x 30

• 4x M3 x 25

• 6x M3 x 20

• 9x M3 x 12

• 2x M2.5 x 15/16

• 5x M3 x 8

• 2x M3 x 6

• 24x M3 Hex Nut

• Material: ABS, ASA, or PC/CF is highly recommended for all toolhead components to withstand the heat from the hotend and enclosed printing environments.

• Tolerances: Ensure your printer’s flow rate is properly calibrated before printing the linear bearing blocks (LM08LUU HDz). Accurate dimensional tolerances are required to ensure the bearings fit securely without binding the carriage movement.