Diode Laser

The decision to use a diode laser instead of a CO2 tube is mainly thanks to the diode's superb simplicity.

The challenge with diode lasers, however, is safety. the rays created from a blue diode laser has a wavelength of about 440 nanometers and are not as readily absorbed by common materials. CO2 lasers, in contrast, produces a wavelength of 10.6 micrometers and are blocked by many transparent plastic materials (polycarbonate, polystyrene, acrylic).

After a fair amount of research, I decided to use a combination of laser shield around the diode and an external enclosure around the frame. The intention is that even a very undesirable scenario of someone walking onto the cutter without proper laser glasses does not result in damaged eyes.

Sourcing the Laser Module

I recommend purchasing 440 nm or 445 nm blue lasers, as they have the best absorption characteristics. 

Common routes to buy a laser module include:

• Amazon
• Banggood
• DTR's Laser Shop
• Endurance Laser
• OdicForce

From what I've found, you most likely want TTL-enabled drivers if you want to do grayscale engraving.... which you probably do.

LCLC is designed around laser modules from DTR's Laser Shop. I trust the shop, as DTR actively participates in Laser Pointer Forum and holds a trusted reputation there. Plus the numerous testings done on DTR's laser drivers on the forum.

The laser comes attached to a copper shaft with diameters of 12 mm, 20 mm, or 25 mm. Then, you would attach it to the laser cutter using a linear rail guide (search "SK12/20/25 CNC" on eBay).

I chose the NUBM08 module and Super X Driver attached to 12 mm shaft, totaling out to around $100. The price is comparable and even cheaper than some laser modules found on Banggood or Amazon.

You should be able to modify one or two parts to support other types of laser modules, although I probably need to redesign the cover before that...

Laser Cover

Air Assist