Level Your Bed: For the text to show up well it is crucial you have a level bed. Follow your printer manufacture’s instructions for the bed level procedure.
Clean Your Bed: Some parts have a very small contact area, so adhesion is critical. For best results follow your printer manufacturers instructions for bed adhesion.
Print the First Layer Slowly: For best results, I recommend you use at least half the first default first layer printing speed to make sure the text comes out clearly.
Increase the Bed Temperature: To get the two tone effect for the tiles, the tiles have less contact area with the print bed than other parts. To compensate for this, it might be necessary to raise your print bed temperature more than you normally would. I find that a change of 5-10C greater than the bed temperature you normally use is good enough. Always consult your printer manufacture manual and filament instructions before making this change.
Performing a Color Change: In order to get the two-color effect without a multiple extruder system it is necessary to change filaments during the print. The first 0.6mm of each tile should be printed in one color and the rest of the part should be printed in a separate contrasting color. Most modern slicers have an easy way to insert this color change G-Code. If you have never done a color change before, consult the documentation of your slicer, for reference here are some documents from some common slicing software.
Prusa Slicer - https://help.prusa3d.com/en/article/color-change_1687
Cura - https://all3dp.com/2/cura-pause-at-height-how-to-do-it/
Selecting Colors: In general, it is best to use contrasting colors, a dark color and a light color, or colors that are complimentary are generally good combinations to start with. You can find complimentary colors here: https://en.wikipedia.org/wiki/Complementary_colors. If you are using a transparent material, it is generally best to make this material the background color. If you are using a light color and dark color, the tile will generally be more visible if you place the darker color in the foreground and the lighter color as the background. If you want to print a transparent color as the foreground it might be more visible if you use smaller layer heights, this will introduce more air in between the layers increasing the opacity.
Nozzle Selection: I have printed these parts with a 0.25mm, 0.4mm, and 0.6mm nozzle. All the nozzles can produce useable parts. Nozzle selection has the most impact on the quality of the tiles. If you are looking to optimize printing time and want to use a larger nozzle to do it, printing the nodes with a 0.6mm nozzle might be a good way to do that. A 0.25mm nozzle will be able to reproduce the smallest details but printing times are much longer. A 0.6mm nozzle can produce parts very quickly but will produce parts with the worst tolerances. A 0.4mm nozzle is the best compromise of being able to reproduce small details and get decent printing speeds.
Multiple Extruder Printers: For printers with the ability to print multiple materials at the same time you can load in one of the special multiple material files available for number nodes. These have a slightly different shape but are fully compatible with other types of Spingies. To print these it is necessary to place supports from the build platform. Supports within the digits are not necessary or recommended. Models intended to be part of the numbers node all begin with the prefix MMU.