HTA3D 330 × 330 × 8 mm machined cast aluminium 3D-printer build plate

330 × 330 × 8 mm machined cast aluminium plate, designed by HTA3D as a robust foundation for a 3D-printer bed. Its thickness adds rigidity and thermal mass, while the machined countersinks and auxiliary threads allow clean integration into a compatible structure.

This size is used by the assembled HPRO-330 and the HPRO-330 kit. It can also be integrated into custom projects when mounting pattern, available space, kinematics and heating system have been checked.

Dimensions and machining

The four M3 threads are symmetrically arranged around the centre with consecutive spacing of 40, 80 and 40 mm. They are auxiliary design points; their use depends on the chosen assembly and they do not replace the four main M4 supports.

A foundation to complete for your machine

The plate does not include a heater or print surface. It can be paired with the 300 × 300 mm, 220 V, 500 W adhesive silicone heater, leaving suitable space for wiring, protective earth and safety devices.

The top face can take a cut-to-size adhesive magnetic sheet and the 330 × 330 mm textured PEI flex plate. A 329 × 329 mm borosilicate glass plate is available as a rigid alternative. Select the final surface for the material, temperature and retention method.

Assembly, geometry and first layer

Machining provides a solid base with defined dimensions, but final behaviour depends on the complete assembly. Check the surface after transport, first cold and then at normal operating temperature. The heater, supports, clamping and thermal expansion can slightly change its geometry.

• Support the plate consistently without pulling it with uneven screw tension.
• Use spacers, springs or a suitable kinematic arrangement for the structure.
• Allow for thermal expansion and avoid restraining the plate in a way the machine was not designed for.
• Mechanically tram the bed before generating a mesh.
• Bed mesh can compensate the first layer, but it does not straighten the structure or replace correct assembly.
• Size motors, lead screws and supports for the complete plate, heater, magnet and print-surface mass.

The silicone spacers with Ø4 mm passage suit compatible M4 assemblies after checking height, compression and stability. An adhesive thermal insulator below the heater can reduce losses and shield components beneath it, provided it does not cover connections, safety devices or areas that must dissipate heat.

Heating and safety

Thermal uniformity depends on more than the aluminium: heater coverage and power, bonding, insulation, sensor position, ambient conditions and firmware control all contribute. Carry out the first heat-up gradually under supervision and compare several locations with an independent instrument.

Compatibility

Directly compatible with the corresponding HPRO-330 bed design. For other printers, do not decide compatibility only from a quoted 300 or 330 mm build area: verify the 330 mm outside size, 320 mm M4 centres, XY travel, available height, cable position, selected surface and Z-axis load capacity.

It is for you if

• You are building or refurbishing an HPRO-330 or a similarly sized custom bed.
• You want a thick, robust foundation and the freedom to choose heater and surface.
• You can verify the mounting pattern and calibrate the bed after installation.

It is not for you if

• You need a complete bed with heater, sensor and surface already installed.
• Your frame cannot accept 330 × 330 mm or a 320 × 320 mm M4 pattern.
• You require a metrology-certified plate or a specified flatness tolerance.

Contents

• 1 × HTA3D 330 × 330 × 8 mm machined cast aluminium plate.

Heater, sensor, magnet, flex plate, glass, insulation, screws and spacers are not included. The drawing, DWG and STEP are available in the official HPRO CAD files.