This model requires the printing of a model and its respective parts, a rubber band, and a screw. The model can be printed either all at once (file 1) or in parts (extra files). The screw is a 64 Philips #4 x 1/2 screw,  but any screw with a length of 1 centimeter or less should be fine. 

The printing parameters used in the photos was 0.2 mm, with triangle fill at 15 percent (10 percent works just fine too). The supports were on, with normal placement and 80° overhang. 

To construct this is pretty simple. Take the main body and twist it onto its right side. Put the marker over the joint on the side of the build, and place the screw head over the marker. Carefully and slowly screw in the Phillips screw in, making adjustments if the marker or head get out of place. 

If you want to customize it, paints work pretty well. There is an M design on the back, along with a heart printed on the front that you can paint over in various colors. Make sure to make it as unique as possible to show your love for them. The biggest part is to make sure that it's filled with lots of love notes! Happy building!