After upgrading my UM2-switch to a dual color printer, it was time to print something.
So I decided to print the name of my new born son.
Although these characters could be printed best on dual color printer, it's also possible to print them with a single color printer.
Since I could not find duplo characters like this, I created a complete duplo compatible dual color ABC..
3MF file format
For multi material prints, it should be nice, starting to use better file formats. So all available characters are saved like 3mf file, which contain both inside and outsides.
Unfortunately thingiverse is currently not recognizing these files as 3d objects. That's why you only see the character 'A' in stl format.
Use for instance cura for opening and printing the files (or save as stl files). Or check this list of 3MF compatible software.
Have fun printing & upload a picture of your print.