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Universal Laser Attachment for 3D Printers Stand Alone System ARDUINO CODE Updated 8/28/2013

by inventworld, published

Universal Laser Attachment for 3D Printers Stand Alone System ARDUINO CODE Updated 8/28/2013 by inventworld Aug 26, 2013
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Summary

http://www.youtube.com/watch?v=_ah5ApzHw8Q&feature=youtu.be
-STAND ALONE LASER ATTACHMENT SYSTEM FOR REPRAP STYLE 3D PRINTERS-

 CAUTION- LASERS ARE DANGEROUS AND WILL BLIND/BURN ANYONE IN VISUAL RANGE IF YOU DO NOT TAKE PROPER  
 PRECAUTIONS OUTLINE IN INDUSTRY STANDARDS. GOOGLE THEM BECAUSE I AM NOT AN EXPERT ON THEM.  

         -BY USING THIS SYSTEM, CODE, IDEA, HARDWARE, SOFTWARE OR ANYTHING RELATED  
          YOU, AND ONLY YOU ARE TAKING FULL RESPONSABILITY FOR THE SAFTY OF ANY PERSONS/PROPERTY  
          THAT MAY BE AFFECTED BY ITS USE/MISUSE. I JAMES SESLER AM NOT LIABLE FOR DAMAGES OF ANY TYPE.  
          I AM RELEASING THIS AS IDEA AND CODE AS OPEN SOURCE WITH THE HOPES IT WILL BE USEFULL   
          TO THE COMMUNITY BUT ALSO WITH NO PROMISE THAT IT WILL BE USEFULL TO ANYONE.  

     -switch a laser driver circuit on and off. NOW with SAFETY toggle OR DOOR switch AND LIGHT 8/26/2013-  

James Sesler August 23 2013 ADDED SAFETY SWITCH AND VISUAL ON AUGUST 26 2013
1) This sketch reads the voltage from a small DC motor or other source
on Analog Pin "0".

 2) If the voltage is higher than the set voltage it triggers digital pin 9 to go high.  

 3) That HIGH 5v signal triggers a switch "MOSFET" transistor to allow power to flow to a laser driver circuit, relay, motor, or other load.  

 4) The dc motor it to be attached to the extruder's stepper motor shaft on a RepRap style 3D Printer so when  
 the stepper is turning that laser will be active and when the stepper stops turning the laser will shut off.  
 This allows a person to use their 3D printer as a laser cutter/engraver without firmware or hardware modification.  
 Simply remove the filament from your extruder, turn down the heat and clip on the laser diode.  

 ----------------->To create the tool paths follow this example of cutting a square:<--------------  

 a) Creat a 3d model of a square that is the same height as a single layer you would 3d print at, usually .3mm  
 b) Make the wall thickness the same as your printers extruder nozzle so your slicing program only generates one pass.  
 c) Turn down the x,y,z travel speed so it moves very slow BUT turn UP the extruder speed so when it turns the DC  
 motor this sketch will be able to detect a sufficent voltage.  
 This sketch should help with creating the model correctly to get the slicer to generate the code correctly   

-->\ \<-- Nozzle diameter Usually .35mm - .4mm
\ \


    |\   _____________  \      
     \  \ ____________|\  \             |  
      \   \____________\  \            |  
        \______________  _\   ___V___  
         \|________________|     ______  
                                                     ^  
                                                     |  
                                                     L_____ One layer thickness usually .3mm  

Instructions

Instructions on how to make the system are in the arduino Code. If you have any questions let me know. This is a work in progress. I have successfully make it work on a bread board but I have not fully implemented it because of a lack of time. I still need a lense to focus the Laser. The included .stl files are pretty universal and should work with most extruder motors and work with whatever small DC Motor you have.

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Comments deleted.

Hey guys! I have noticed there hasn't been much updating to this Thing... how's it going? Is it feasible? I am looking to build a laser engraver attachment for my printer and so far this is one of the only ideas that has caught my eye. If this is something that works can someone let me know and possibly mentor me as i attempt to reproduce the Thing? Thanks!

Great idea !

As you aim this project for reprap style printers, why don't you simply sniff the pulse signal on the driver board for that motor? This would reduce considerably the complexity of your project. Pleased to read from you.
Joel

I did that yesterday. Here's a experiment: https://www.youtube.com/watch?v=w1g9BzI6TdUhttps://www.youtube.com/watch?...
It is actually better to read signals from the "enable" pin though. But then I'll have to modify the gcodes, instead if I read the pulse for the stepper, then I could get to know the virtual extruder's direction. So that after some programming for the Arduino I can still use the same slicing software and retract every time I want the laser to turn off which to the slicer is before the the printer has to do any non-printing moves. (as long as you uncheck this option "only retract when crossing perimeters" on slic3er)

Hi Logiq. You bring up a good point. That is the plan but I want people to have another option if they don't feel comfortable soldering into their stepper driver. I'm looking to have a small group of people help finish this project because I don't know when I'll get time to finish it on my own. Life has gotten very busy.

Marcus,
Could you determine where to tap into the stepper driver on the few most common versions?

Marcus,
I intentionally left it out for the moment because I'm waiting for my lens to show up. When it does I will post additional pics and .stl's along with the alternative arduino code for using a digital input from the stepper driver.

I can't see any laser in the photos.
Just some blue, 3d printed parts holding a tiny DC motor to a filament drive.

I intentionally left it out for the moment because I'm
waiting for my lens to show up. When it does I will post additional pics
and .stl's. Along with the alternative arduino code for using a digital
input from the stepper driver just as you suggested.

Looks interesting. Are you able to post a fritzing diagram and BOM for what you have so far?

I will do that within the next couple days. Keep checking back for updates.

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