Now how do we change the parameters? Through variables.
 
Variables are just values you can change to re-generate your new SGBox.
Variables can be anything from width, height or even material thickness.
 
In the design document you will find a tab called “globals”, if you open it you will discover a probably scary block of code.
 
Hopefully we only care about a few lines that are quite self-explanatory.
 
To see your change happen live, open another browser tab, and open the document at “assemblies/assembly-all-visible”.
 
Every time you save your changes with ctrl+s or by pressing the “Commit” button, the 3d assembly will update.

Ok so here’s the list of variables we have access to as of now:
 

• Width
• Height
• thicknessBig
• thicknessSmall
• thicknessBase
• plantHoleWidth
• doorFrameHorizontalMargin
• doorFrameTopMargin
• doorFrameBottomMargin
• doorHorizontalInnerEdge
• doorVerticalInnerEdge
• verticalHolesSpacing
• nVerticalHoles
• verticalHolesOffset
   
  So that’s already a bit, let's break them down in the following steps.

The first and easiest to change are width and height.
 
Those are obvious, they control the outer width and height of the box.
 
Make sure to take the height of the wheels into account when calculating the total height of the box.

The next parameter we can deal with is the material thickness.
Changing the thickness is useful when your material is not the default 3 and 6mm MDF.
But also if you want to do something bigger or smaller, using the default thicknesses might not be the best.
 

• thicknessBig: That’s the thickness of the thicker mdf, by defaults it’s 6mm. This one is used for the whole structure.
• thicknessSmall: Default is 3mm, used for the doors and a few smaller parts.
• thicknessBase: Default is 6mm, that’s the thickness of the base plate that holds everything.

After adjusting the size you might need to adjust the size of the hole in the plant plate.
 
You can do so by adjusting the plantHoleWidth variable.

Now we can adjust the doors dimensions.
To do so we have three variables:
 

• doorFrameHorizontalMargin: that’s the margin on the right and left sides of the door.
• doorFrameTopMargin: the available space above the growing space, make it bigger to add other devices, like a co2 bottle maybe?
• doorFrameBottomMargin: the available space in the lower space of the box. You can make it bigger if you are planning to do a hydroponic box.

Now we can customize the door size.
 
The door is made of two planks attached together, a thick one and a thinner one.
 
The inner thick one is determined by the previous step measures.
 
The two variables are:
 

• doorHorizontalInnerEdge
• doorVerticalInnerEdge

Now that we’ve changed all kind of parameters we might need to adjust the position of the panels.
By default the sides of the box are attached with three points. But you might need to change that.
 
We have three variables for that:
 

• verticalHolesSpacing: Spacing between the holes.
• nVerticalHoles: Number of holes, unfortunately the tool as its limitations, so you will have to change that in the design sketches too (detailed in the next step).
• verticalHolesOffset:By default the holes are aligned around the center of the side’s height. This can be an issue if you changed the lower or upper margin. Use this variable to move the holes up or down.

In the previous step we talked about the nVerticalHoles variable.
As said the tool doesn’t allow to change this value automatically like the other dimensions.
 
So we need to do this change manually.
 
To do so:
 

• Open the document at design/laser/structure/side
• Double click the “Sketch 1” in the left column.
• Locate the little “3x” on one of the sides. Double click it, change the value, press enter to save the change.
• Click the green check in the “Sketch 1” window to save & close