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Prusa I2 for laser etching

Posted by Shank man 
Prusa I2 for laser etching
December 13, 2017 01:36PM
With a inexpensive Eleksmaker 2.5w blue laser module and a rotary Y-axis adapter, I wanted to see if it was possible to etch these acrylic tumblers. Overall I'm happy with the results.I'm coating the surface with a dry erase marker and if its not put on
uniformly some of it gets embedded in the molten acrylic and can't be removed. The rest of the marker washes off with warm water. I'll
need to experiment with a different surface method to see what works best.

All of the engraving was done at 50mm/ second. The Scull and OpenSource logo took a little over 50 minutes. The Laser logo was a 21 minute job.








Re: Prusa I2 for laser etching
December 14, 2017 09:01PM
Well done!

Interesting setup. Where did you find the Y adapter?
Are you using this laser ? [www.ebay.com]?

thanks
Re: Prusa I2 for laser etching
December 15, 2017 03:57AM
Quote
kd6hq
Well done!

Interesting setup. Where did you find the Y adapter?
Are you using this laser ? [www.ebay.com]?

thanks


The gears for the Y adapter are scaled up versions of the big gear for a Wades Geared Extruder. The rest of the set-up
was made in Openscad. It would be better served with a pulley and belt approach but I wasn't sure on a method to splice a belt together Overall It is a piss-poor design but seems to work just fine. It uses cut down M8 threaded rod, 608 bearings and some M8 hex nuts. I cut up a rubber band into strips and glued them to the cone to provide some grip.

yeah that is the same laser I'm using and it works great. I also got those green safety glasses that popped up when I clicked on your link.
Re: Prusa I2 for laser etching
December 15, 2017 10:37AM
Well, as long as it works, it can't be all bad.
If you don't mind how do you have the laser connected?
What turns it on and off?

Edited 1 time(s). Last edit at 12/15/2017 11:02AM by kd6hq.
Re: Prusa I2 for laser etching
December 15, 2017 03:37PM
Quote
kd6hq
Well, as long as it works, it can't be all bad.
If you don't mind how do you have the laser connected?
What turns it on and off?

I have it connected to the D9 or fan connection on the Ramps board. Any PWM connections on any control board should work too.
The laser came with a 12vdc power supply. I clipped off the barrel connector and tied this into the Ramps.
I had to set the board to 33 in the marlin firmware. Its also possible to run the laser from a TTL signal but I'm not sure how to set that up yet,

I use Inkscape with the 305 Engineering extension to generate the gcode to turn the laser on and off.

// 33 = RAMPS 1.3 (Power outputs: Extruder, Bed, Fan)
Re: Prusa I2 for laser etching
December 15, 2017 05:40PM
I'm doing the same thing. The only difference is that I do not use the supplied power supply. I converted a printer and it already had enough power to run the laser.
I've been a little bit disappointed in the laser only because it does not use the PWM signal as well as I would like. However I think it's a good learning tool and can be used for a lot of thinks just the way it is.

I think I'm going to have to make one of the rotary Y axis adapters. Looks like that could be fun.
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