You have the choice when using SketchList 3D to either opt for flexibility or for a rigid definition of sizes.
For example you might determine that an assembly is 12 inches deep and design it at that depth. One common mistake people make is when specifying the depth of the assembly to include any overhanging parts like a crown molding. So in reality that assembly is not 12 inches deep but perhaps 15 inches deep
If you opt for set definition of sizes you would need to go to the project level and select the assembly working on and change its depth of from 12 to 15.
If you opt for flexible sizes SketchList 3-D would make the assembly 3 inches deeper . So you would not receive an error message and be required to manually change the assembly size. (As a disclaimer I must add that though SketchList 3D will make the assembly 3 inches deeper, you would need to perform a batch move - that is all one step move - taking all of the objects in the assembly and pushing into the back by the 3 inches you need.)
There are times when you would want to have a fixed limit to your project and/or assemblies. There are times when you want to have some flexibility – if you're in a creative situation where maybe the project size is fixed by the room but the objects within the project can very.
In SketchList 3D you can control what is fixed and what is flexible.
Generally the rules are as follows.
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An assembly must fit into its project.
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A door must fit into its assembly.
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A drawer must fit into its assembly.
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A board must fit into its assembly.
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A board must fit into its drawer.
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The board must fit into its door.
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Hardware must fit into its assembly.
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Hardware must fit into its door.
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Hardware must fit into its drawer.
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Materials must fit into hardware containers.
Generally that makes sense. But there are times when you want the flexibility and then is provided at your option.