@JuJuDelta Thanks! I used 8mm thick dual layer PC that fits very nicely into the 8mm wide slots in the 4040 t-slot. It looks nice, but can make working on the machine a little troublesome. I have reworked a couple parts of the Z axis to make it easy to work on without removing any of the PC panels, and I never have to work on the XY mechanism, except the extruder carriage where I do a lot of experimenting with extruders and hot-ends. It's a pretty low maintenance machine, partially because I used very few plastic parts in the mechanism.
It wasn't nearly as costly as you might think. I built it using a lot of surplus parts and materials gathered over about a year, so it cost a little over $1k all-in. I did the limited amount of machining myself at the makerspace.
I find that setting the chamber to 50C allows me to print ABS without worrying about it splitting or warping. It's also not hot enough to cause problems for the motors or other mechanical parts. The XY motors are outside the chamber, but they didn't really have to be. The electronics are all in the top of the machine, away from the heat.
