Utility knife

Opens much easier than the original.
building on the visible surfaces. Allowing a specialized build plate. 
Depending on your printer settings you might choose to leave the snap out.

It also has printed pivots. They are fragile without the screw. Start the screw before mounting together.

the pictures show the steps to assemble.

careful opening and closing. It is very easy to cut yourself.

Hardware needed

M3 hex nut.

M3 x 12 Screw, designed for Socket head Cap Screw, but should work fine with Pan, or Filister heads.

M3 x 6 screw, Pan head is better. but will work with Socket Head Cap Screw, or Filister heads.

standard utility knife blade.