B1: Adjust laser focus

Proper laser focus is one of the most important setup steps for achieving clean engraving lines and efficient cutting results. In this guide, you’ll learn exactly how to adjust the laser focus on the LONGER B1 laser engraver using the official focusing block method.

Whether you are a beginner using your machine for the first time or troubleshooting poor engraving quality, this tutorial will help you achieve more accurate and consistent results.

Table of Contents

• What This Guide Covers
• Quick Answer
• Why Laser Focus Matters
• Before You Start
• Requirements
• Precautions
• Step-by-Step Tutorial
• Common Problems and Solutions
• Tips for Better Results
• Frequently Asked Questions
• Final Thoughts

What This Guide Covers

This guide explains how to:

• Adjust the laser focus on the LONGER B1 laser engraver
• Use the focusing block correctly
• Position the laser module properly
• Tighten the M3*20 handle screw securely
• Improve engraving and cutting precision

The procedure follows the official LONGER instructions exactly.

Quick Answer

To adjust the laser focus on the LONGER B1:

1. Pull out the focusing block.
2. Loosen the M3*20 handle screw.
3. Move the laser module down.
4. Tighten the M3*20 handle screw when the bottom of the focusing block touches the plywood.
5. Close the focusing block.

This sets the correct focal distance between the laser module and the material surface.

Why Laser Focus Matters

Laser focus directly affects engraving sharpness, cutting power, and overall machine performance.

When the laser is focused correctly:

• Engraving lines appear cleaner and sharper
• Cutting becomes faster and more efficient
• Burn marks are reduced
• Fine details are easier to reproduce
• Material penetration improves

If the laser focus is incorrect, you may notice:

• Blurry or wide engraving lines
• Incomplete cuts
• Excessive burning or charring
• Reduced engraving depth
• Poor detail quality

The LONGER B1 uses a focusing block system to help users quickly set the proper laser height for consistent results.

Before You Start

Before adjusting the laser focus, make sure your machine is properly assembled and placed on a stable work surface.

It is also important to position your engraving material securely to prevent movement during setup or operation.

If this is your first time using the machine, review the official LONGER B1 setup documentation and safety instructions before proceeding.

Product Support  Link：https://www.longer3d.com/pages/download

Requirements

Prepare the following items before starting:

• LONGER B1 laser engraver
• Installed laser module
• Focusing block
• Plywood or engraving material
• Proper eye protection

Follow official machine specifications or instructions.

Precautions

Before adjusting laser focus, keep these safety precautions in mind:

• Always wear appropriate laser safety protection.
• Ensure the machine is powered and positioned safely.
• Keep hands away from the laser emission area.
• Do not force the laser module during adjustment.
• Make sure the material surface is flat and stable.
• Tighten the M3*20 handle screw securely after positioning.

The LONGER B1 series includes multiple safety features designed to improve operational safety during engraving and cutting tasks.

Step-by-Step Tutorial

Step 1: Pull Out the Focusing Block

Action

Pull out the focusing block from the laser module assembly.

Expected Result

The focusing block should extend fully and be ready to contact the plywood surface.

Important Notes

The focusing block is used to set the correct distance between the laser module and the material surface. This distance is critical for achieving proper laser focus.

Do not modify or replace the focusing block with unofficial spacers or measurement tools.

Step 2: Loosen the M3*20 Handle Screw

Action

Loosen the M3*20 handle screw on the laser module.

Expected Result

The laser module should move freely up and down after loosening the screw.

Important Notes

Only loosen the screw enough to allow movement of the laser module.

Avoid removing the screw completely unless official instructions require it.

Step 3: Move the Laser Module Down

Action

Move the laser module downward carefully.

Expected Result

The laser module should lower toward the plywood surface.

Important Notes

Lower the module slowly and steadily to avoid hitting the material surface too hard.

Ensure the plywood remains flat during adjustment.

Step 4: Tighten the M3*20 Handle Screw When the Bottom of the Focusing Block Touches the Plywood

Action

Continue lowering the laser module until the bottom of the focusing block touches the plywood.

Then tighten the M3*20 handle screw.

Expected Result

The laser module should remain fixed securely at the correct focal height.

Important Notes

This is the most important part of the focusing process.

The focusing block touching the plywood indicates the correct focal distance recommended for the LONGER B1 laser engraver.

Do not overtighten the handle screw excessively.

Step 5: Close the Focusing Block

Action

Close the focusing block after tightening the screw.

Expected Result

The focusing block should return to its stored position, and the laser module should remain properly adjusted.

Important Notes

Always close the focusing block before beginning engraving or cutting operations.

Leaving it open during operation may interfere with material positioning or machine movement.

Common Problems and Solutions

Tips for Better Results

Use Flat Materials

Warped or uneven materials can affect laser focus consistency across the engraving area.

Check Focus Before Important Projects

Even small changes in material thickness may require rechecking the focus.

Keep the Laser Module Clean

Dust or residue on the laser lens can reduce engraving quality and cutting performance.

Secure Materials Properly

Movement during engraving may affect precision and focus consistency.

Perform Test Engravings

Before starting a large project, run a small test pattern to confirm the focus is correct.

Frequently Asked Questions

How often should I adjust laser focus?

You should check and adjust focus whenever you change material thickness or notice reduced engraving quality.

What happens if the laser is out of focus?

An unfocused laser may produce blurry engravings, weak cuts, excessive burning, or inconsistent results.

Can I use materials other than plywood for focus adjustment?

The official procedure references plywood. Follow official machine specifications or instructions for other materials.

Why is the focusing block important?

The focusing block helps maintain the correct distance between the laser module and the material surface for optimal laser performance.

Should the focusing block stay open during engraving?

No. After adjusting the laser focus, close the focusing block before starting engraving or cutting.

What does the M3*20 handle screw do?

The M3*20 handle screw locks the laser module in place after the correct focus height is set.

Can poor focus damage engraving quality?

Yes. Incorrect focus can significantly reduce engraving sharpness and cutting efficiency.

Is laser focus adjustment required for every project?

Not always, but it is recommended whenever you switch to materials with different thicknesses.

Final Thoughts

Adjusting laser focus on the LONGER B1 laser engraver is a simple but essential process for achieving clean engravings and efficient cuts. Using the official focusing block method helps ensure the laser module is positioned at the correct height for optimal performance.

By following the official procedure carefully and checking focus regularly, beginners and experienced users alike can improve engraving precision, reduce cutting issues, and achieve more reliable results on a wide range of projects.