Volcano-extension for Integrated BMG mount

I only tested this with a BMG-Clone-Case, not the printed one, but I really liked the low-weight V6-mount with the integrated BMG. It works pretty good with a V6, but I also wanted to use a Volcano for larger nozzles.

The BLTouch and the fan needed to be moved around 8.5 down, so there is a spacer for the BLTouch-mount (you only need some longer screws). The mounting-point in the front-plate moved down a little and I enlarged the "leg" on the downside for the fan-shroud.

Changing to the Volcano is pretty easy. Just install the Hotend itself and use the two new parts. Z-Offset may need to be adjusted a little.

At least the front-plate should be printed in PETG or some material which can handle more temperature, because it's mounted directly over the heater-block.

The first BL-Touch-Mount needed to be filed down a little, because it was too big. Therefore I changed this in v2, but I couldn't test it so far. You also could just use some other spacers which around 8.5mm height.