First Layer: The Perfect First Layer
Secrets of a perfect first layer: proper calibration, temperature settings, and the right slicer parameters to ensure adhesion.
⏱ Estimated time: 10 min
Procedure
Nozzle Height Calibration
The first layer determines the success of the entire print. The correct height is critical.
📐 What Is Z-Offset and Why Does It Matter?
Z-offset: the most important number in the printer settings
0 in extra or less = the gap between success and failure
The Z-offset determines the exact distance between the nozzle and the build plate. A proper first layer is the foundation of every successful print.
- The ideal distance
- ~0-0.01in (paper test)
- Too Close
- See recommended range for this material.
- Too Far
- The fibers do not stick together, the model comes off when crossing
- When to Calibrate
- Always at the operating temperature of the pad and the nozzle
Paper Test: Place a sheet of office paper under the nozzle. Correct height: paper pulls with slight resistance, but passes.
Calibrate while hot: Metal elongates due to thermal expansion. Z-offset set when cold will be different when warm - always calibrate at print temperature.
Live Adjust Z: Most modern printers allow you to adjust the Z-offset while printing the first layer. Track the result and adjust in real time.
🔲 Mesh Bed Leveling – Full-Surface Calibration
Why Auto-Leveling Isn't Enough Without Mesh Calibration
There is no such thing as a flat pad – the mesh compensates for every millimeter
The build plate is not perfectly flat. Mesh bed leveling measures the height using a grid of points, and the firmware compensates for deviations in real time.
How to run mesh calibration: Start "Bed Mesh Calibration" in the printer menu. The printer passes the mat in a grid of points (3x3 or 5x5).
Result: The firmware saves the height map and dynamically adjusts the Z axis when printing so that the first layer is the same height everywhere.
When to recalibrate: After each relocation of the printer, replacement of the pad or significant change in ambient temperature.
BL-Touch, CR Touch, probes: Automatic probes measure height more accurately than a paper test. It pays for every printer without factory bed calibration.
✅ What Does a Proper First Coat Look Like?
Visual Inspection of the First Layer in Practice
Plastic slightly squished into a pad without gaps = ideal
You can tell if the first layer is right just by looking at it. You don't need to measure it—you just need to know what to look for.
✅ Correct: The lines of the plastic are slightly extended in width and are easily absorbed into the mat. The surface looks compact and without gaps.
❌ Too Close (Elephant Foot): The plastic is squished to the width, the first layer is transparent or digs into the substrate. The model is more difficult to remove from PEI.
❌ Too far: The lines of the plastic are round and do not stick together. The model moves or detaches completely during crossings.
Key point: Adjust the Z-offset in 0 in increments and observe the result. The correct first layer means 80% of the success of the entire print.