This is Prusa's original IKEA LACK enclosure resized for Creality Ender 3. Corners are made taller, the power supply holder is wider, the corner to run cables under is on the right.
https://blog.prusaprinters.org/cheap-simple-3d-printer-enclosure/
Note: you'll need #14 x 2 screws for the pre-drilled holes, not #12 as the instructions indicate
For attaching legs to the printed corners, use #12 x 3/4
You will also need assorted smaller screws for the PSU, magnet holder, spool holder, etcMagnets could be thinner/weaker than the blog calls for otherwise your glue may not hold them in place.
Extruded acrylic from TAPPlastics.com:
3   Extruded Acrylic - Clear (Cut-to-Size) - Clear
3 mm Thick, 440 mm Wide, 525 mm Long    $12.71  $38.12
2   Extruded Acrylic - Clear (Cut-to-Size) - Clear
3 mm Thick, 220 mm Wide, 525 mm Long    $6.35   $12.71  
I am including two different spool holders. The original one from Prusa has four rollers and does not utilize the spool holder Ender comes with. It usually works fine but I had…