Laser engraving

Also don’t Forget to set and save the higher laser power after focusing - I also did have my Problems at my first try.

Haha, it surprises me that you found the size of the dot when the laser is focused. Actually less than 0.5 mm is enough. I will upload the calibration card later so that you can print it out and help you find the focus.

Here is the calibration card I talked about:
Calibration Card

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could i print out the card bigger so i can see the dot…? :wink:

actually, all jokes aside, perhaps a ring around the dot for us old farts with dim vision…

william…

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@Rainie

Can you make this calibration card available for downloading and printing?

Have a great week and a happy Chinese New Year to all of you

Doug

Hi @william.o.yates and @Rainie @Noah

I would also appreciate knowing what the optimum height above the project that the laser head should be placed. With the focus ring turned all the way in, the bottom of the laser lens head is about 39mm above the project and i need a minimum of 80% power. Lower power gets no results.

Keep having fun

Doug

Hi Doug,

Here is the calibration card of PDF file for downloading (Forum can’t upload PDF file so I compress it).

Calibration-Card-output.pdf.zip (814.0 KB)

The optimum height is quiet different when the laser module is produced. Because it’s mainly depends on the focus, which may change by rotating. Just move the Z axis to make it as small as possible, then it will be a best height.

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Hi, just been trying out the laser but I have a question…is there a way to move the image so the origin point would be in the centre rather than the bottom left as this would make it much easier to position the laser correctly.

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Hi @elminster

I am a newbie and I find the origin also referred to as the Toohead position is fine where it is. I turn on the Laser Focus, move the beam to what would be the lower left position, Click on Run Boundary and when it looks good, I click on Set Origin then I start the print. To me having the origin in the centre would be more difficult to setup,

Hope this helps

Doug

Thanks for the advice, I just thought that being able to work from the centre as an option could help. Weirdly enough in the cnc tutorial the image is centred on the origin point when loaded into the software.

@elminster

I found when testing small images 50x50mm, I could do 4 easily on the one piece of 150gsm white card, which was my test bed. Ir was easy to do the first print to the front left corner of the platform.

When complete I could turn on the laser Focus again and re-position the beam to the right side of the first image, reset the origin and run the second print and so forth, move the beam further back above the first image set the focus. I could easily print 4 images on the one card.

BTW if you use ordinary 80gsm paper you are likely to burn holes through it depending on how much the laser dwells in the one spot and what power level you are using. That is why I tried 150gsm card.

Despite my terrible photography the greyscale image came out like a photo. As mentioned earlier I am yet to try wood, leather or acrylic materials.

Needless to say I am impressed at what the Snapmaker can do.

Doug

@doug - can you share your settings for image. work speed (mm/min) , dwell time(ms/pixel), quality (pix/mm) - and laser power

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Hi @gjo

All the standard settings except;

Algorithm: Stucki
Dwell: 30
Laser Power: 90% ((note this applies to my Snapmaker and I understand it varies between Snapmakers)
The image size was 50x62mm

The print took 4hrs 45mins

I hope this helps you, keep having fun

Doug

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Hello Team,

I would like to buy a Snapmaker to print QR-Codes on Key-Chains. The material will be leather and it will have a size of 2x2 cm. Does the laser engraving have a high enough quality so that it will be possible to scan the QR-code with a smartphone?

I am thankful for any kind of experience you can share.

Thank you for your support. Jan

@jan_ka
I’m pretty sure this will work when you are able to do this with an ink jet printer (of course on paper)!
Currently I’m in 2 print jobs (I have 2 Snapmakers) but I will make a test for you on wood when you send me the file.

Michael

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@jan_ka
Hi Jan
It works like a charm!
I’ve created my own test with Inkscape (PNG export 265x265px @ 96dpi) - set to 20x20 mm in Snapmakerjs:

QR

My prints with 100%, 50% and 33% of the 200mW laser power @ 220 mm/min on plywood:

The results (all 3 QR-codes are working):

PS: The one with 100% was a slightly different text…a little bit burnt but it works too.

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Hello Team,
this is really great collaboration. Looks super good.
One last question: Did one of you ever print on leather? Is the quality like on wood?
Best,
Jan

Dear Jan
I allready saw something in this forum.
For example here:

Michael

Laser engraving, which is a subset of laser marking, is the practice of using lasers to engrave an object. The impact of laser marking has been more pronounced for specially designed “laserable” materials and also for some paints. These include laser-sensitive polymers and novel metal alloys.

I think you should try leveling down the laser power.