needs to be used, and a meter is needed to be
able to discern it.
• Price: $10, ROI: 10
• Ease of setup: 4
• Link to part: smile.amazon.com/gp/product/
B07DH77XBS
• Instructions: k40.se/k40-laser-electronics/
install-ma-meter
• Recommendation: MUST DO
3
SAFETY GLASSES
CO
2
lasers are not visible to the human eye. You
can’t tell if backscatter from the beam is causing
damage until after it’s occurred. The lid of the
K40 has a tinted panel that serves as a filter, but
whenever you’re aligning mirrors or doing other
operations that need to fire the laser while the
lid is up, appropriate eye protection is essential.
The wavelength that the K40 CO
2
laser emits
ranges from 10,400–10,600nm; glasses rated at
10,600nm are the most readily available.
• Price: $45, ROI: 10
• Ease of installation: 10
• Recommendation: MUST DO
4
LIGHTBURN SOFTWARE
LightBurn is a full-featured laser controlling
package. While a variety of functional freeware
packages like K40Whisperer are totally usable,
LightBurn offers many more features that make
it worth the license fee. LightBurn requires an
upgraded controller board (e.g. the Cohesion3D
LaserBoard listed below) to work with a K40.
• Price: $60, ROI: 8
• Ease of installation: 10
• Link to part: cohesion3d.com/shop/software/
lightburn-software
• Instructions: lasercutting.avataar120.com/
en/2021/08/01/installing-lightburn-and-
setting-it-up-in-3-steps
• Recommendation: NICE TO DO
5
COHESION3D LASERBOARD
The stock K40 controller board cannot vary
laser power, so it can’t do actual grayscale
images —it only does dither-type “grays.” It
also limits the software that can be used. A
variety of after-market controllers are available,
with the Cohesion3D LaserBoard arguably the
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