Printing and scanning will always risk some loss of quality compared to uploading a digital file directly.
Some keyboard shortcuts that might help:
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Ctrl + Up Arrow & Ctrl + Down Arrow : Adjusts the brightness
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Ctrl + Shift + Up Arrow & Ctrl + Shift + Down Arrow : Fill in small details / preserve small details
There are many tutorials in our Tips and Tricks section of our community forum: https://community.glowforge.com/c/glowforge-tips-and-tricks . You may find this community post about the trace function a useful place to start:
Glowforge Interface - Using the Trace Tool 🤔
I’m moving this thread to the Beyond the Manual so the discussion can continue there.