kingsong ks-18l ---> sturdier kickstand and front bumper

new version for the https://www.printables.com/model/940843-kingsong-ks-18l-kickstand .
corrected distance between screws and made it sturdier, with support from the lateral shell.

also, added a front bumper (or rear bumper, if you prefer the kickstand on the front, which may not be a good idea, since the power button would be faced down).

print the kickstand in PETG, with 6-8walls and 50% infill, 2mm top/bottom width.  the bumper may be in PETG or TPU, with whatever settings you like.

as it turns out (but not exactly planned), the front bumper may also serve as a kickstand, although not as stable as the actual one.

double-side tape may be positioned on both side “wings”, to add extra grip and stability.

they may be printed without support, if you rotate 90°.  

I hope it's useful to someone.

please, share it if you print it :)