Attached to each gift under the tree is a tag baring a cryptic message etched into a 3d-printed tag. Align the mask and the message is revealed.
Each tag is constructed using Inkscape and the font “porker”. The exported SVG file can be imported into fusion360 as a sketch. Once it is appropriately scaled and aligned, select the pieces of each that are NOT the letter (aka the negative space like the hole o the”O” etc.) and extrude only those pieces.
The mask is simply a series of windows that exactly align with the letters of all your messages.