This model is an aperiodic tessellation – the P2 Penrose Tile pair. To form an aperiodic tiling, the tiles must be connected according to the matching rules. The model includes two versions that have different annotations on the tile to guide the matching rule. The annotations are designed to be colored, so they are at different heights (2mm to 2.5 mm and 2.5 mm to 3 mm) so that they can be colored differently by layer changes on a single-extruder printer. The two annotations are:
Each 3mf file contains a set of tile pairs laid out to fill as much of the printer bed as possible. After inserting the model in the slicer, you can find the best alignment for your printer bed and then delete any tiles that is outside the printable area of the bed. An example is shown in the bed layout photo.
Suggestions for printing:
If you expect to leave the printer for any period of time, I suggest you add custom G-code to turn the part cooling fan off during the color change. Otherwise, it will blow on the bed and cause the parts near the corner to lift. This can cause the print to fail if it's bad enough, but at least those tiles will be ruined because the hot end will dig into them.
The G-code for color changes can be accessed from Printer Settings tab > Custom G-code item > scroll down to the Color Change G-code text box. The default G-code is:M600
G1 E0.4 F1500 ; prime after color change
I suggest changing it to:
M107 ; Fan off before color change
M600
M106 S255 ; Fan on after color change
G1 E0.4 F1500 ; prime after color change
The M107
code turns the fan off, and the M106
sets it back to 255 (max). Note that the fan speed has to be set to a fixed number – the placeholder variable to know the current fan speed is not available in this part of the slicer. So if you use part cooling other than max, you should adjust the value accordingly. This also assumes that the color change happens after the part-cooling fan should be on. If you were doing a color change on a very low layer (when the part cooling fan should be off), you might have to manually edit the generated gcode to leave the part fan off after the color change on those layers only.
The author marked this model as their own original creation.