From mesh, 2 Years ago, written in CAD DCL (Dialog Control Language).
Embed
  1. width=210;
  2. length=210;
  3. height=250;
  4. thickness=10;
  5.  
  6. //cube([width,length,height]);
  7. cube([width,thickness,thickness]);
  8. translate([0,(length-thickness),0])
  9.     cube([width,thickness,thickness]);
  10. translate([0,0,(height-thickness)]) {
  11.     cube([width,thickness,thickness]);
  12.     translate([0,(length-thickness),0])
  13.         cube([width,thickness,thickness]);
  14. };
  15.  
  16. cube([thickness,length,thickness]);
  17. translate([(width-thickness),0,0])
  18.     cube([thickness,length,thickness]);
  19. translate([0,0,(height-thickness)]) {
  20.     cube([thickness,length,thickness]);
  21.     translate([(width-thickness),0,0])
  22.         cube([thickness,length,thickness]);
  23. };
  24.  
  25. cube([thickness,thickness,height]);
  26. translate([(width-thickness),0,0])
  27.     cube([thickness,thickness,height]);
  28. translate([0,(length-thickness),0])
  29.     cube([thickness,thickness,height]);
  30. translate([(width-thickness),(length-thickness),0])
  31.     cube([thickness,thickness,height]);
  32.