The prusa caster is a pretty cool design for a printable guitar. However, it is still missing strap buttons. One guitar strap is added to the top honeycomb piece (that's what this remix is for) and one strap is added to the top middle piece. However, the mk3+'s bed is too small to print the strap directly to that one. For that, I used the following remix:
https://www.printables.com/model/410999-prusacaster-hexagons-wstrap-mount-holes
Now, print a guitar strap button (the one that this model remixes) and bolt them together!
Printing the part may seem a bit challenging, as the strap button starts printing in mid air. I used regular supports to support the strap button, however, now that organic supports are out, I would suggest printing it with that. However, even with the traditional supports, as you can see in the pictures, the strap button prints quite well!
The author remixed this model.