Thanks to help from Bulldog I have improved on my tile work.
Getting better but still some work to do. There seems to be some unevenness in the output, you can see like a binocular effect in the bottom centre of a darker patch. Not sure what that isā¦ It may be the original image.
There are also lines going down the image which is strange as I engraved across the image???
800mm/min
100 power
Jarvis
3.5w diode
2hr 9mins
Brilliant picture, lines probably down to belt tension 
Thanks for sharing the photo and the settings, without this information it is ājust a fineā picture.
What is the ābelt tensionāā¦ I am using a 3018cnc machine so not sure if this would apply???
No,i guess it wouldnāt 
Looking goodā¦If tile not cleaned first and uneven coatā¦or not dry tou will get blotches
The vertical lines indicate a mechanical issue with your laser gantry (x axis)ā¦loose beltā¦debris in gearā¦beltsā¦loose wheelsā¦wobbly lensā¦loose laser moduleā¦You especially see these lines in tilesā¦(with wood the burn radius generally hides this anomaly)
tile will show any little anomalies with your systemā¦I,ve spent hundreds of hours trying to solve this ā¦
Basic Mechanical Checks:
Remove all belts from steppers
By hand move both gantries upā¦downā¦side to side applying both horizontal and vertical pressure
Feel for any bumps ā¦tightnessā¦wheel slopā¦bearing wearā¦stepper bracket momentā¦
Clean all the track v-grooves and wheels
Grab the laser module ā¦see if there is any movement play
Same for Laser lens
Ensure that x and y gantries are at 90 degrees
Put belts on and ensure tightened correctly
Okey dokeyā¦ All noted.
I ha e now tightened all screws etc, a few defo needed a good turn. Hopefully that will solve the lines.
I thought even coverage of the paint might affect the patchesā¦ I find getting an even coat tricky to be honest (Iām not the great at spray paints).
I have however managed to ācolouriseā the tile though. Iām really chuffed with this now.
