J Tech Photonics Laser Mount for Mostly Printed CNC

by izytronic, published

J Tech Photonics Laser Mount for Mostly Printed CNC by izytronic Jun 7, 2015


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Turn your Mostly Printed CNC into a Laser Engraver and Cutter.
You can engrave and cut all kind of plastics, light wood, etc. For cutting only thin materials are suitable.

When you use this mount, then first adjust the laser as described in the manual and then add the lid. The fan will cool the laser module (important for the life-time) and blow away dust from the lense.

First engraving test (and first video i made :P ): [Engraving Wood](https://youtu.be/WM2AMtxMhMk )

Addon: Check out the new version of the lid with two line lasers.

The mount was tested with the IE version of the CNC with 25mm conduits.

What else do you need?

  • 30mm 12V fan
  • 4x M3x16 bolts for the fan
  • 2x M3x16 bolts to mount the laser module
  • 6x M3 nut
  • 3x M4x16 bolts for the lid
  • 2x M4x20 bolts to tighten the conduit mount
  • 5x M4 nut

Safety first!
When you are using a laser module ALWAYS wear eye protection! Even scattered radioation can make you blind. Your eyes cannot shut quick enough to avoid damage! A laser is no toy so please don't handle it like one.

Also be careful with the fume that is generated while engraving. Use a filter with activated carbon or at least keep your windows open.

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im want to ave the possibility to engrave wood, acrylic, aluminiuim and side panels of PCs ( not sure what metal are they made of), what kinda laser would i need to get. And what else do i need to get so that i can run it on my MP CNC?

thanks for the info

Which modified marlin are you using? Also how you generate gcode? Sorry for my questions because I have only experience 3d printing (marlin,Cura...)

There's no need to modify marlin, the laser works with a "normal" configured 3d printer board with an output for a fan (e.g. D9 on RAMPS). Have a look at this manual, it's very good: http://jtechphotonics.com/?page_id=2012

Thanks for inkspace plugin that very useful. My TTL driver has arrived. I purchased this http://www.ebay.com/itm/181657463022?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT. On this board there is a TTL input between 0v and 5v. I test it direct ramps 5v and ground connect and adjust laser output 6,5v and 1,6 amps. It works but D9 pin is 12v so I need max 5v for TTL.

I will try that the laser driver 12v power connect to D9 pin and TTL to 5v. That way I can cut or engrave only on-off method, still need a TTL solution

Did you finished your engraver?

How do you control the laser? PWM or on-off ? I want to know if you use TTL laser controller or not.


Currently the control input of my laser module is connected to D9 and can be turned on with gcode M106 and turned off with M107. That works fine for normal engraving or cutting, but controling the laser power is mandatory for engraving pictures with different shades.
I'm working on a TTL solution using one of the servo-ports on the RAMPS board. It will use the M280 gcode. Right now I don't get my laser at full power this way. It seems I need to use the servo-output to control a transistor and supply 12V to the laser module (servo out is only 3.3V or 5V on the pulse wire). Maybe I can give a "go" tomorrow.

Using D9 for controlling is good but how do you adjust current? I know that the current is important for laser diode life. Also I look forward to your TTL solution. Good work!

Using D9 just let's you turn the laser on or off, so 0% or 100%. Generally the current is adjusted at the laser driver board. This laser module can be operated from 1.3Amps to 2.5Amps - and you're right, 2.5Amps would reduce the lifetime dramatically. So I set the current to 1.8Amps at the moment and I'm using a fan to keep the laser module cool. Cooling is also important for the life-time. There is a input for a control signal (currently on D9), but as I said: only on or off. D9 cannot be used to produce a TTL signal (as far as I know), but the servo-outputs can. It works partly and I can regulate the laser power, but I don't reach the same max. laser power. It could be that the servo-signal-voltage is too low. So I will use this low voltage to control a transistor and can supply a 12V TTL signal to the control input. I hope that fixes my issue.

D9 is PWM. Example: M106 S127 is 50% on marlin, S can be 0 to 255. Ref: http://reprap.org/wiki/G-code that what i was going to use.

I tried controlling the laser with the M106 command again. I don't know what I did wrong during the first tests, but now it works perfectly.
Using the D9 on the RAMPS board connected directly to the control-input of the J Tech Photonics Bundle works. The laser power can be adjusted with M106 S0 = off to M106 S255 = full power.

I tried that, but it didn't work. At 0% the laser was off, as far as I remebember anything above 20% turned it on at full power, no way to control the laser power.
And PWM is not the same as TTL. I have to understand to problem myself why controlling the laser is not working, then I can solve it ;)

Videos of something burning! Sorry I can't wait to see this in action! There is another laser setup that just got recommended on the hot end mount page. The other one is cheaper but involves more work. Now I'm torn.

Give me some days for the final setup of my CNC, I'm currently working on an easy way of building large amounts of cable sets (ready to use, without soldering etc.).
I want to whole thing working without using any interim solution :-)

-OLD- Mostly Printed CNC -Part- Solderless Stepper Mount
by Allted

Another solderless cable solution!

X Y Z Jacks for Mostly Printed CNC / Multitool

I know, great thing! But I want a cable set ready to use from the two steppers of one axis including the plug for the RAMPS board.