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 print