Print to Scale with Model Builder

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Model Builder can print your projects in Z, N, HO, S, O, OO, Standard Scale, G, One Inch
Military Models Scales: 1:32, 1:35, 1:72, 28mm, 32mm.
Miniature scales 1:144, 1:120, 1:48, 1:12
Any scale between 1:10 and 1:480

From the opening screen:

you can choose a scale, or input your custom ratio in the "Other" box.
Model scale ratio setup box
If you need help deciding, Model Builder also comes with a Scale Guide:
Model builder scale information
Model builder scale setup box

Once you choose a scale and enter the program
Everything you drop on the screen will automatically default to your chosen scale.

Unit selection dialog box

In this example, we have a 6.5 foot tall door that is 3 feet wide in HO scale.