Precision Modeling To Scale (Real World Units).

In your Scene Properties tab, choose between either Metric or Imperial units. By default, Metric will use Meters as the base unit of measure, but you can work with much smaller metric units as well by adjusting the Scale parameter. Just do a Google conversion for Meters to whichever metric unit you wish to work within your scene, like millimeters, then adjust the scale accordingly. For example, we know that 1 Meter = 1000 Millimeters, so if you adjust the Scale parameter to 0.001, your Blender scene units will now become Millimeters because you have reduced the default by 1000x. You can verify this is true by tapping N to bring up your Properties panel, and checking the dimensions of the objects in your scene; they should be measured now in Millimeters (mm). As yet another example, the default cube in a Blender startup scene is 2m if you switch to Metric scene units. Changing the scale to 0.001 will change that dimension to 2mm in the Properties panel.

Modeling in mm is most useful for 3D printing, especially if you want to upload models to Shapeways. Just keep in mind that not all the modeling tool properties in Blender will obey the Metric scene units in their parameter display, so be mindful that things like beveling should be done with a modifier, if you need precision in that regard.

______________________________________

My Store
My Free Models
My Video Tutorials
My CG Animations
Instagram: @luxxeon3d
Facebook: https://www.facebook.com/luxxeon