When you say a "yellow outline" do you mean a few pixels? That's correct, it's over-scan to prevent any dark edges. If it's solid yellow, perhaps you disabled "Skip Blank Lines" in the Image Settings menu?
Send me an example by email or create a new thread in the appropriate section.
Thermoplastics (PLA and ABS) do not work well, you can engrave them but they don't hold much detail as they melt. Acrylic is excellent.
I always start with full power and feed rate of say 1500, if it burns too much you increase the feed rate and if it doesn't burn/cut you decrease the feed rate. If you end up at over 3000 for feed then it's time to start reducing the power.
Technically you should be able to engrave at speeds higher than 3000, probably up to 4000 but your machine needs to be perfectly setup with low friction and belt tension. I usually suggest 2500 max as a safe level for good results.
DO NOT SUPPLY POWER TO YOUR LASER OR THE CONTROL BOARD UNTIL INSTRUCTED TO DO SO BELOW
Change Regional Setting DECIMAL , to .
Install Eleksmaker Cam software on your computer.
Right click elekscam icon on deskstop, select PROPERTIES, select COMPATIBILITY, check the box Run this program as an administrator, click APPLY, click OK.
Plug the USB into the NANO.
Plug USB into your computer.
In elekscam click SETTING section
Install the DRIVER.
In elekscam select COTROL
In COTROL select a PORT -DO NOT CLICK THE REFRESH SYMBOL, DO NOT CLICK THE REFRESH SYMBOL.
In elekscam selct SETTING
In SETTING click RST ROM - let the software run.
After software installs CLOSE elekscam.
In CONTROL, look for PORT, select the appropriate COM port.
PLUG IN THE POWER TO YOUR LASER.