alternative to Mic-6 bed plate
Most of the aluminium alloys are fine.
When they say that a certain aluminium is not suitable to certain temperature range they usually mean &quot;under stress&quot;... your bed has no stress at all, it's just staying there with basically no weight on top of it.
Also, you don't need the single micron accuracy either...
Just pick a &quot;cast&quot; and milled aluminium and not a rolled one.
If you can choose among different ones, pick the one with the highest thermal conductivity, and that's it. For example, I can easily find milled plates out of 5083 or 7021. 7021 has a better thermal conductivity, which is good to have a more uniform temperature.