Blocks R21

The Blocks R21 is an FDM 3D printer from Blocks with a 210 x 300 x 250 mm build volume.

Specifications

Hello Krasi, and welcome to this technical analysis of the Blocks R21. Today, we are investigating a compact industrial FDM system from Portuguese manufacturer Blocks Technology. Designed to meet the demands of continuous, professional-grade production, the R21 offers high rigidity and dimensional accuracy in a compact form factor. Equipped with linear guides and a semi-enclosed chassis, the R21 is widely utilized by engineering departments to fabricate functional prototypes and manufacturing aids. Let's break down its verified technical specifications:.

Calibration

Tuning the Blocks R21 for high dimensional accuracy requires balancing mechanical alignment with the software compensation systems. Follow these 8 calibration steps:

• Dual Z-axis Synchronization:
• Description: Since the Z-axis is driven by two independent motors on a shared driver or separate drivers without auto-alignment, the bed can lose horizontal alignment when powered down. Turn off the printer.

Common defects

• Hardware defects and mechanical weaknesses
• Z-motor Desynchronization: Because the dual Z-motors run on a shared driver or separate drivers without auto-alignment, mechanical resistance on one side of the bed (due to lack of lubrication or rail tension) will cause one motor to lag. This tilts the bed, resulting in layer height variances. Solution: Manually square the bed gantry and apply grease to the Z-axis guide shafts.

What it is used for

Recommended:

• Manufacturing Jigs and Fixtures: The rigid steel chassis and linear guide rails provide high dimensional accuracy for assembly templates.
• Large-Format PETG and PLA Parts: The 210 x 300 x 250 mm build volume is suitable for printing large enclosures and brackets without sectioning.