This is a dummy model of the Arcol.hu hot-end v3.0, because a hot-end can\'t be printed using plastic:)
You can print it to get a general feeling of the actual size. Also the mounting should be correct, so if you are working on your own machine, or new drive mechanism, you can adapt it easily by printing out this model.
The M3 bolt heads are commented out in the .scad file, to be printable.
I also added real photos for comparison.
You can read more about the hot-end itself at:
Print it, try it, adapt your machine.:)