Semi-parametric screw box

####The original f3d file is available for download.

• Params:
  • [Width, Length, Height] determines the size of the box
  • [div_w, div_l] determines division of the box
    • As I failed to figure out conditional parameter, so the division must be larger than or equal to 2
  • Wall_Thick is the thickness
    • The example print that's shown in the picture used 1.2, I cracked it on the first drop on the ground( now UV glued ), can add if you want the box tougher
  • top_ring_Heigh is the height of the cover's ring
    • Close latching mechanism not designed at this point
    • Using the friction that the layer imperfection produces to stay close, so the height shouldn't be too little
    • The ring shouldn't be too long as it's not compensated for the circular motion around the hinge
  • fit_tolerance is the tolerance of the gap fitting
  • [screw_tolerance, screw_d]
    • Not favourited, but still can change according to your printer
    • Standard part needed: (if you didn't change the screw param)
      • M3 x >= 10 screw x 2
      • Self tightening nut x 2 ( or you can use 4 normal nuts and tighten 2 against each other)

Future possible improvement:
* Latching mechanism
* Fully customizable grid (Might be not possible for me to do in f3d, may switch to OScad)
* Joint that doesn't require standard parts.