About now I send the parts to the machine to be cut while I work out other bits I need, my machine is 50watt so the ribs cut from 3mm MDF take about 20mins to cut, with a laser the three settings I work with are speed, so how fast the head moves, power and frequency which is how quickly the laser pulses out its beam so 3mm MDF would be about 15% speed 100% power and 2500 frequency.
When I cut the 6mm MDF for the locating strips and spacers the only ting that changes is the speed which I drop back to 7%
It takes a bit of practice to get the hang of speed v power depending on the material to be cut, something like 3mm acrylic runs at about 25% speed 100% power but I up the frequency to 5000 so I get a near flame polished edge, kinda cool really:)
If I'm cutting 1mm ABS I will drop the power right down to 10% but run it at max speed so it doesn't create to much heat and melt the piece or distort the edge
Here's the parts showing how they locate onto those strips.
By the way the thickest I have cut is 25mm acrylic which I ran at 2%speed 100% power, it actually came out well but the laser beam tends to bend when it goes too deep.