Glass is perfect if you want to cut yourself
(sorry for the pun Didier )
I would use acrylic, because the glass which is cheaper than acrylic is usually the very brittle stuff. You can't cut it yourself, except if you have special tools for that purpose.
Good window glass (maybe 4-5mm thick?), framed with aluminum extrusion profiles and sealed with silicone is of course better than an acrylic frame, but that's going to be very heavy and expensive. I'd stick to acrylic...
You do need to be able to cut stuff like the opening for the fan / filter. You can't just use rectangular panels off-the-shelf, without cutting them to shape.
Just remembered, I bought a 0.9mm thick PET-sheet for a similar purpose. It's easy to cut, but very strong. It's also cheap.
You can buy it in DIY stores. It's most commonly used to temporarily cover broken windows or other makeshift coverings around the house.
Don't know if you can lasercut the PET sheet. But it's more suitable for hand-tools than acrylic.
Lasercutting could work (doesn't contain chlorine - shouldn't be a health issue), you have to ask in a FabLab (or wherever you'd lasercut stuff).
There are several project for UM2 enclosing chambers on the forum:
I'm guessing you can take ideas from these mods for the UMO as the machine is basically similar.
Glass is probably good, i think acrylic can probably be easier to cut yourself if for some reason it doesn't fit your needs, its probably lighter too.
You want to print ABS with the UMO i guess?
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