Hey Adriano! I’ve actually spent the past week trying to figure out the exact same thing. My conclusions so far:
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The Universal format from OLF is currently the only one that works in Carbide Create (or most graphic design software). It works because it’s not actually a single line font - it’s just a regular bubble font where both sides of the letter’s outline happen to be positioned directly on top of one another, making it appear like a single line. The other formats (like OC) don’t work in Carbide Create because it wants the font’s letters to be complete, closed shapes, so it adds extra lines to close them. (For example, the letter V would have a line added to the top, turning it into a triangle.)
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While the Universal format looks perfect, a small problem is that each letter is still being formed by 2 identical, connected lines - so when you create the toolpath to send to your CNC, the CNC traces each letter twice (accomplishing nothing the 2nd time), doubling the amount of machine time required. My thought is that in the future, a (hopefully) simple update could be made to Carbide Create to find & delete these redundant paths in the gcode - but I’m not a programmer, so perhaps that’s more complicated than it seems.
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If you want to test this out for yourself, there’s a link on the OLF homepage to download a free sample font with just the letters A, B, C, & D included. The download includes all 4 font formats, so you can try each one and see how it works (or doesn’t work) in Carbide Create.
Hope that helps! I’d be interested to hear anything new that you figure out.