Physical Virtual Business Card

This OpenSCAD script generates a credit card sized card that holds a QR code that contains a business card, using the V-Card standard. Yes, that means you can give people your v-card. 

To generate your own, open the script in OpenSCAD and change the variables that relate to personal information. The Preview should show the card. You'll probably need to install the QR library I used.

Note that the actual render happens with the lines all the way at the bottom of the scripts, and you should render and export the card and code / text separately. Then, import both into your slicer.

It's obviously easiest to print this on a multi-material printer, but you don't need one. In Prusaslicer, you can make a profile for your printer with multiple extruders and then set M600 (change filament) as the custom gcode for changing extruders. You'll still need to go in afterwards and remove the first M600 (at the start of the print, it's not necessary) as well as any T0 / T1 commands (that's “swap extruder” and won't do anything except either crash the firmware or pause the toolhead in an inconvenient spot for a few seconds). I made the card on the included picture that way, and provided the used gcode and 3MF files as an example. NB: This gcode assumed that the first color loaded into the machine is the background color!

There are some limitations: I don't think a printer can do dots that are smaller than about twice the nozzle width, so if you have a very long name for example the QR code might not be able to print on a 0.4 nozzle. You can check this in the slicer preview. 

I printed this one in really cheap Kingroon PETG filament with a 0.4 mm E3D Revo nozzle on a Prusa MK3S. PLA might be the better choice since it tends to be more opaque. To get the best surface finish, print with the text facing down. I'd also recommend turning on “Avoid crossing perimeters” under Print settings → Layers and perimeters → Quality.

If you want to print this on a single filament printer without using the trick mentioned above, you could alter the script to have the "lettering" stand proud of the surface, and add in a color swap on a layer change. Alternatively, you could print only the card without the inlaid text, and then carefully color in either the surface or the inlays manually. In that case, you should probably print with the text facing up.

I'm sharing this one as CC0 because you'll need to alter it in order for it to be useful, I've used somebody else's OpenSCAD library, and I don't want to assume any responsibility. Still, if you like what I've made here I'd appreciate a shoutout.