I will try some of the settings you mentioned and 45 deg also for direction. I have some poplar so I’ll give it another try this weekend and see the difference. You can experiment with these values to get the best engraving results and cut down on your engraving time too. You can start out with a feedrate at 150IPM? and use a FRC of 40%?. Also the Feed Rate Change feature will speed up the feedrate in white areas and slow to burn in the black areas. Select Skip White when using B&W Dithered Logos or text as it will cut down on engraving time. When raster laser engraving with grbl, the Analog/PWM engraving profile is recommended as it has the most features. The Un’-burnt line almost looks like a PWM connection was lost on that pass, but it’s hard to really tell what actually happened there. On post 85? in this thread, I have some recommended grbl settings changes. As Rick stated, a 45D angle works best for motion smoothness when raster engraving running in grbl and because 45D brings the burn lines slightly closer together. The focal point size (.006"-.007"), focusing height (3"), beam orientation (parallel with the engraving angle) and the engraving angle itself is important. If there are, the image is not pure 1bit B&W. Look in your gcode file and see if there is any S PWM values other then S0 & S255. If there is not just pure black & white in the image, there will be ramping of laser power on the edges which looks like what could be happening. But, any image needs to be edited & resized and saved first before reopening it to Dither the image. A minimum of 100DPI is recommended and the PEP5 image editor will save at 100DPI. The Threshold Dithering Algorithm works best for B&W logos or text providing the DPI of the image is not too low. Looking at the original text, I can see some grayscale, but it may be because it was attached as an image here on the forum. Grayscale engraving is better achieved on less prominent grain woods such as Poplar so the burn/shades is more linear. We always sand across the grains with fine sandpaper with any wood we laser engrave images on. Pine is will engrave black & white without issue, but the image must be Dithered in the PEP5 image editor first. There are ways for improvements as Rick mentions.
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