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OptLasers plh3d-2w Engraving Kit  

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rbuehlma
(@rbuehlma)
New Member
OptLasers plh3d-2w Engraving Kit

Hi all,

after I bought my Prusa i3 as my first 3d Printer about two years ago, I got a big fan of it and am still using it frequently.

Using the i3, I have also built a simple laser engraver. Now, I have read about this upgrade to the Prusa i3:
https://optlasersgrav.com/cnc-laser-upgrade-kits/prusa-laser-upgrade-kit-with-plh3d-2w

I'm now playing with the thought of replacing my engraver with this upgrade kit. Since I cannot find any reviews of this kit, I would like to ask, if someone here already has some experience with it?

Do you have any concerns with such a kit?

Thank you in any case.

Posted : 08/07/2021 10:13 pm
rscott
(@rscott)
New Member
Also interested

Hello -

I also am considering that kit. Did you end up purchasing it? If so, what was your experience with install/setup and use?

Posted : 19/07/2021 3:41 pm
rbuehlma
(@rbuehlma)
New Member
Topic starter answered:
First experience

Yes, I did buy one. The installation was quite easy. Engraving with full power seems to work fine (I didn't use it frequently yet), but there are some issues when having the laser at a lower power:

The laser uses the PWM signal also used to control the front fan. This PWM signal can be controlled by the gcode M106 and M107 but the printers' firmware has some additional logic to control the fan which now seems to also impact the laser. This image illustrates three issues I found:

The Image should be an uniform light gray engraving but there are these issues:

  1. The lower left corner is darker
  2. Darker lines are appearing in the middle of a line
  3. For some lines, the laser kicks in too late

I'm in contact with OptLasers to solve these issues. A workaround for 1. was already found but 2. and 3. seem to be a bit more complicated and I'm still waiting for a solution from OptLasers.

I will post an update as soon as I know more.

Posted : 19/07/2021 9:29 pm
rscott
(@rscott)
New Member
Settings for printed part

Do you recall what print settings you used to print the part off?

 

Posted : 27/07/2021 9:08 pm
rscott
(@rscott)
New Member
Workarounds

What was the work-around suggested for #1? Have you heard anything else regarding the other issues?

Posted : 27/07/2021 9:08 pm
rbuehlma
(@rbuehlma)
New Member
Topic starter answered:
Print settings & workaround

I used ABS since the motor gets quite hot and enabled support for the pocket on the top. I don't believe that part requires any thing special.

The workaround for #1 is basically to never completely turn of the fan and instead of M107 and M106 S0, use M106 S1. With this, the laser is still off but when turning on the laser, the firmware will not go to full power first.

The other issues are still open and I hope that OptLasers will come up with a solution. Until then, I would not recommend to buy this upgrade.

Posted : 28/07/2021 9:43 am
rbuehlma
(@rbuehlma)
New Member
Topic starter answered:
Fix by soldering

Since I have not yet received any update from OptLasers, I have decided to try the workaround proposed by this analysis:

Prusa MK3 Laser TTL Pin Experiments

Technically, the best option seems to be to use pin 7 of the ATmega. Since that pin is not wired to anything, you need to solder a wire to it. Soldering at such a small scale is far beyond my skills and my tools. Luckily I know someone with both, the skill and the required tools, and this is the outcome:

Using that pin, I can now engrave without the above issues.

If you are not willing to solder on your Einsy, I would still wait with buying this kit until Optlasers comes up with an easier solution.

Posted : 13/08/2021 10:00 pm
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