I enclosed my P3Steel in hopes to improve my prints with hard to print materials as ABS and decided to documented. You can get it as cheap as ~20$ if you use polycarbonate instead of methacrylate.
Materials used:
Ikea LACK small table (55x55 cm)
Metal hinges
Black push pins
M3 5mm flatheaded screws
M3 nuts
2.5 mm thick methacrylate sheets*
*(you can use polycarbonate as is generally cheaper than methacrylate but is less flexible and can break easily when you cut it)