🛠️FlowRate and Z-Offset Test 

Most tests focus only on the First Layer or the Top Layer, ignoring that an incorrect Z-Offset can often be mistaken for an extrusion issue. This model allows you to analyze both simultaneously to achieve perfect results.

• Check First Layer: Verify adhesion and line squish (Z-Offset).
• Check Top Layer: Verify surface finish and fullness (Flow Rate).
• The Rule: If both layers show the same defect, it’s a Flow Rate issue. If only the first layer is off, you need to adjust your Z-Offset.

Project Structure

• Plate 1 (Extra-Rough): 0.05 steps for a base initial calibration.
• Plate 2 (Rough): 0.02 steps for a standard calibration.
• Plate 3 (Fine): 0.004 steps for professional-grade precision.
• Plate 4 (Single): A single test piece for final verification after adjustments.

Quick Interpretation

• Defects on both sides: Adjust the Flow Rate. 

  

• Defects only on the first layer: Adjust the Z-Offset.

  

Flow Rate Calculation

Apply the value of your actual flowrate sto current_flow:

new_flow = current_flow * (1 + test_value)

Example: If your current flow is 0.98 and your best sample is -0.02

0.98*(1-0.02)=0.96

🧮 Automatic Calculator

Don't want to do the math? Use the tool I created here:

Flow Rate Calculator

Note: Keep in mind that since these are multipliers, the 'rough' test isn't truly raw if your starting flow is already low (e.g., 0.94). 

DISCLAIMER for Enclosed 3D Printer Users:
If you are using an enclosed printer (such as a P2S or H2D), it is highly recommended to preheat the chamber to approximately 30°C before this print. If the automatic bed leveling is performed at a lower chamber temperature (e.g., 26–27°C) than the actual printing temperature, the leveling mesh may be inaccurate. This thermal variance can cause false positives for Z-offset issues, which often manifest as localized under-extrusion (for example, in specific corners of the build plate).