Kossel Pro

The Kossel Pro is an FDM 3D printer from Johann with a 250 x 250 x 250 mm build volume.

Specifications

The Kossel Pro is an industrial-grade delta FDM (Fused Deposition Modeling) 3D printer designed by Terence Tam and launched through a highly successful Kickstarter campaign under the OpenBeam brand. Unlike standard RepRap delta kits of its era, which relied on 3D-printed plastic joints and brackets, the Kossel Pro features stamped aluminum brackets, injection-molded carbon-fiber-reinforced nylon components, and heavy-duty linear guide rails. This design ensures mechanical rigidity and consistent manufacturing tolerances.

• Kinematics: Parallel delta kinematic motion platform.

Calibration

Achieving precise prints on the Kossel Pro requires calibrating delta-specific geometry parameters within the Marlin firmware. Follow these eight steps to tune your machine:

• Frame Rigidity and Squareness Check:

Use a machinist's square to verify that all three vertical towers are perpendicular (90 degrees) to the bottom horizontal frame triangle.

• Expected result: Torsional alignment of the vertical rails, eliminating mechanical binding in the linear carriages.

Common defects

• Hardware defects and mechanical weaknesses
• Z-Probe Deployment Failures: The mechanical slider mechanism for the auto-leveling probe can stick due to dust buildup or thermal expansion of the housing.
• Symptoms: The probe fails to deploy during `G29` or `G33` commands, causing the nozzle to crash into the bed.
• Solution: Clean and lubricate the probe shaft with dry PTFE spray, or upgrade to a modern optical or magnetic sensor (like a BLTouch).

What it is used for

Suitable applications

• Printing Tall Organic Forms: Highly suited for vase-mode prints, decorative columns, and organic sculptures. The stationary bed ensures that tall prints do not wobble as they grow taller.