Do you need a whole baseplate, or just a small 75x75mm piece for under the galvo block ?
Let me know, i always go to the scrapyard were i have taken a lot of plate material.
5 mm thick, 8mm, 10mmm...
So how big, thick and so on do you need ? I might have something lying around (you can file, saw and drill it to size at my place...)
But a solid baseplate what Laserwinkel said is always a good idea.
Michel Rietveld also just bought a nice flat plate, somewhere in Rotterdam, might be interesting to compare places ?
I didn't fail !
I just found out 10,000 ways that didn't work.