Hi all… i have a s30 pro max … when i try to make a □ shape X axes ( left right ) work good cut 1 turn 400 speed 100 power ( mdf 3mm ) but Y axes ( up down ) have lower power and is not enough to do 1 turn … i checkd all belts pinions all is good … here is some photos
Your laser spot is described as .06mm x .08mm, (I think) which is pretty darn good. Unfortunately, it is not round or square. This means there is a ratio of 3:4 in the light beam. It also means there is a 25% difference in power between the Xaxis and Yaxis, with X being more concentrated. This is the nature of diode lasers.
Here is a suggestion: Ramp up the speed and make multiple passes. Then compare the times and burn results with what you have now. I cut 3mm ply at 60% and 800mm/min with a 10w diode. That is half the power of yours.
As Mike already pointed out, the laser beam is not square and therefore one direction cuts better than the other. Though, you should never cut at borderline settings, always choose one pass more than required. Otherwise, you can always have some areas not cut through because the material varies.
Here is some additional background on settings and effects:
This is very optimistic by Sculpfun 
In reality, the size is about 0.12mm (four times the area they pretend it to be 
) But every manufacturer I know is not honest about the spot size
I wouldn’t trust that unless I measured it myself on a randomly picked unit. My 20W (different label, but likely the same diode guts) is advertised at the same .06x.08. I measure it at closer to .10x.15…after many hours working out the best focus for various materials. Mine exhibits the same symptoms as the OP.
These Chinese companies copy/paste whatever the leading competition or tech developers publish but use lesser grade components and poor assembly tolerance. You ~might~ get a “good one”, but it’s luck…or you’re a compensated “influencer” getting a hand picked ringer.
Stop it! You are breaking my heart!
Even worse, a 2:3 ratio. Ergo, 33% more power in X than Y.
I tryed different settings s30promax 20w
1st…1x400spd100power-dont cut Yaxes
2nd…2x600spd100power-dont cut Yaxes
3rd…3x800spd100power-dont cut Yaxes
Also my friend have same laser we bought same time… and he can cut 1x400spd100power … same settings same laser for me i cant
Basically, while increasing passes, you don’t increase speed simultaneously.
Anyway, another reason could be that the y-axis is mechanically close to getting stuck and the motor drawing too much power to move the gantry. At least there is a chance that this will cause the laser to reduce power (since the Sculpfun power supplies sometimes are not the best either). Can you make sure it’s running smoothly? Do the tilt test (Guide to mechanical adjustments and maintenance)
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