I have added grids for the top shelf of the 34" Harbor Freight US General toolbox. The upper area of the box is smaller than the lower shelves, and is constructed differently. The design Harbor Freight used creates a 1-2mm lip where the walls are spot welded to the lower metal of the drawer. I played with two designs where the grids extended wall to wall, but the raised lip area created too many problems. Instead I opted to create grids that go lip to lip and don't overlap the lip. You lose some shelf space by the grids lay completely flat. Here is the breakdown of the files for the top shelf:

TOP BL - Bottom Left - you will need 1 print

TOP BC - Bottom Center - you will need 1 print

TOP BR - Bottom right - you will need 1 print

TOP CL- Center Left - you will need 1 print

TOP CC - Center Center - you will need 1 print

TOP CR - Center Right - you will need 1 print

TOP UL - Top Left - you will need 1 print

TOP UC - Top Center - you wil need 1 print

TOP UR - Top Right -you will need 1 print

Here are the other grids for the remaining shelves. Here is the breakdown of  the files:

BL - Bottom Left - you will need 1 print

BC - Bottom Center - you will need 2 prints

BR - Bottom right - you will need 1 print

CL- Center Left - you will need 1 print

CC - Center Center - you will need 2 prints 

CR - Center Right - you will need 1 print

TL - Top Left - you will need 1 print

TC - Top Center - you wil need 2 prints

TR - Top Right -you will need 1 print