How to minimize ridge between fill and line?

LightBurn Software Questions
1

How can I elimitate this ridge between my line and fill?

Falcon2 Pro 40W diode

Line - (4) passes of 15% at 6000mm/s
Fill - (2) passes of cross-hatch 15% at 6000mm/s

This produces an engraving with minimal charring. But I see this ridge between the fill and clean line. What setting would I adjust to minimize the ridge?

This example used four passes of fill without cross-hatch FWIW. Cross-hatch still had the ridges.

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2

If you’re not already, run the line before the fill. That should create a clean outline from which the the fill engrave will work around. Kind of like outlining before coloring with a crayon.

3

Thanks for this. Confirmed I am doing my line before my fill.

4

In that case consider these additional approaches:

  1. Focus on the line cut and see if you can get a deeper engraving before proceeding to fill
  2. Try insetting the fill portion so that it’s receded away from the line just a bit so that it’s not overburning that area
  3. If you haven’t already, make sure you don’t have excessive scanning offset. If you burn a rectangle with a large interval and bidirectional burn, do the sides line up properly?
  4. Review the fill interval to make sure you’re at an ideal interval
5

Slowing down did the trick. Slowed from

6000mm/minute 15% power(6 watts)
to
2000/mm/m 5% power (2 watts)

…cleaned up things nicely. Not sure what the term is but the time it takes to turn on and off the laser and have it respond is not as much an issue when you slow down?

6

Are you saying for the fill operation? If so, it’s possible you’re dealing with a mechanical issue. I’d suggest running an offset scanning test as indicated above. If you find an issue with offset scanning I’d suggest first trying to eliminate any backlash in your system first before trying to resolve with software.

7

I noted above I figured it out by lowering speed and power.

8

I understood that you were stating that as a resolution to the problem. However, I was suggesting that if that was your fix for the fill layer that you may be experiencing a separate issue that’s at the root cause of what you’re experiencing. It was unclear based on only what we’ve discussed so far so was suggesting a test to demonstrate.

9

I’m guessing it’s a factor of ramp up and ramp down time for the laser power along side speed.

10

What you’re describing seems extreme for the output you’re getting and should be mitigated by overscan. Are you using overscan?

11

2.5mm of overscan.

12

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