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Laser beam focusing

Laser beam focusingLaser beam focusing

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Diode laser beam focusing

G2 short focal lens

3 Element long focal lens

About different types of laser lens


Laser beam focusing

Our latest lens research

About different lens: laser beam spot, focal range.

Laser beam focusing Beginner Guide Correct Laser Focus Point (PDF) written by Florian Kelsch

About laser lens

correct laser lens position

Measuring of a focal length (range) for different type of laser lens

Focal length for 3 element laser lens
Focal length for G8 laser lens

Watch these video about laser beam focusing

Improvement of laser beam focusing

Adding 3rd spacer and get a fixed focusing range
No need to focus the laser again.

Focusing of a triple beam 30 watt laser

Laser focusing using a 3 element regular lens

It is very important to set up a proper focus range on your diode lasers.

Here is the guidance of how to set up a laser focus range on a 3D printer or CNC machine:
We experimented with an Endurance Anet A8 3D printer combo (a laser engraver + a laser cutter).

1. To setup “home”, that is to find 0 for the Z-axis we use the command “G28 Z0” for the Anet A8 3D printer.

2. We move the laser up to 50 mm above the Z axis.

3. Measure the range between the lens and the worktop, it is 37 mm, it means that the laser is 13 mm below the 0 (50 mm – 37 mm).

4. The estimated laser focal range for the 3 elements regular lens is ~60 mm, so we need to move the laser up to the expected focal range, that is 60 mm + 13 mm = 73 mm, where 3 mm is the difference between the 0 and the actual laser position.

5. Run the g-code (test1.gc)

This g-code draws 20 lines by way of changing the Z axis height starting from 64 mm (- 9 mm from the initial setting of 73 mm) up to 83 mm (+10 mm).

The optimal focal range is considered the one when the thinnest line (on a piece of wood or plywood) or most clear-cut (on an anodized aluminum plate) were made. To keep your laser in focus use always these parameters for the Z axis.

Nota bene:
Do not forget to measure the thickness of the material that you are going to cut or engrave and add it to the initial height of the 0 levels.

We use an aluminum anodized plate 0.5 mm thick.

However, if you want to get even better results you may run another g-code (test2.gc) with smaller steps (0.1 mm).
The optimal focal range for a regular (long focal 3 element lens) in our experiments was 71.1 mm from the Z 0 (home) position.

As for this 10 watt diode laser you need to make a correction for the focal range to get the best engraving results: 71.1 mm – 13 mm (difference between the laser height and the Z 0 position) – 0.5 mm (thickness of the material)= 57.6 mm; this is the range between the lens and the surface of the work material.

Laser focusing using a G-2 lens

For a short focal G2 lens we start to make measurements at the Z height of 19.3 mm + 0.5 mm, the thickness of the anodized aluminum plate and get the best focal range at 6.8 mm hight.


We made a lot of different tests manually setting the focal range for each laser and each lens; it varies from 20 to100 mm for a 3 element lens, and from 2 to10 mm for a G2 lens.

For a 3 element lens the best focal range is 57.6 mm

For a G2 lens the best focal range is 6.8 mm.

Learn more about laser beam focusing

Laser beam focusing

Laser beam focusing


focus test (g-code example for laser beam focusing)



Installation and adjustment of a 10W laser on 3D printers Anet A8 from Inkscape & Repetier-Host

When the module is installed and fastened 1-2 cm above the extruder nozzle, proceed with its connection. Here everything is simple, there’s no need to rack your brains (we did it for you). are We connect the laser control panel directly to the module itself, we connect the 12V power supply to it, and connect the fan power to the FAN 1 connector to the control board of the 3D printer.

Next, to the laser module itself, we connect the 12V power separately (external power supply). If everything is connected correctly, the fans start working; to run the laser just turn on the toggle switch on the control panel, and a laser beam will glow.

Now it is necessary to adjust the lens to focus the laser beam. To make the task easier I recommend that you draw a line, approximately 4-5 cm long, using Inkscape. Convert these lines into a G-code and load it into the Repetier-Host program.

To adjust the focus measure the height of the laser above the workpiece on the work table with a ruler. As a starting point, I use the bottom of the aluminum box of the module itself. Next, lift the carriage up about 9 cm and begin to rotate the lens until the laser beam appears as a sharp small dot on the workpiece where you are going to engrave the lines. Start engraving. The focus is correct if the engraved line is clear. If not so repeat this procedure until you get a clear thin line, using the control in the program Repetier-Host, raise the carriage to any desired height (this can be done to within 0, 0.1 mm) and start again for engraving.

Explore abilities with z axes

2 new Z gantry made for new 10 watt Endurance Laser. Adding additional abilities

Do this procedure to the extent that we do not have a clear, even and thin line.

Independent test of Endurance laser lens pack

“As you may know, Endurance Lasers offers several different lens configurations which are now available in a “pack.” I now have the standard 3-Element, which came with my laser, and the G-2, G-7, and G-8 lenses which I received a couple of weeks ago. Now that I had them all, why not do a little experimenting?”by John Walker

Laser cutting and laser engraving for home and for business.

Advantages of Endurance lasers

High-quality standard

Multi-level testing system.
Industrial components.

Ultra reliable

The guaranteed duration of the continuous operation ~48-72 hours.

True continuous power output

Our products have the rated power output as advertised – unlike Chinese analogues.

TTL mode

Can be turned on and off with 3.5-24V.
Variable power output.

Plug and play

Universal and compatible mount.
Compatible with most 3D printers and CNC machines.

Friendly return policy

Do not like the laser?
Simply return within 30 days and get a full refund.

Laser attachments and laser engraving (marking) machines.

Why do our customers buy lasers and engraving machines from Endurance?

Real-time advice

We assist and give advice by Phone / Email / Facebook messenger / Telegram / Whatsapp / Viber.

Professional support

We help to install and tune the laser. We offer qualified after-sales support.

Everything you need

We ship everything you need in one parcel to get started.

Immediate delivery

We ship all units within 4-24 hours. DHL express delivery allows you to get the package in 3-5 days.

Lifetime warranty

All our lasers are tested and could work up to 10000 hours.

Upgrade option

Do you have an old model? Upgrade your unit with more powerful one.

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