I finished the mechanical portion of the build last night, by completing and installing the print head, which I have been somewhat erroneously been referring to as simply the extruder. On the Prusa that would be correct since it's all one unit, but on the Voron the print head is actually made up of the extruder (the part containing the motor and gears that push the plastic), and the toolhead/cooling unit. The latter contains the hot end where the filament is melted, and the fans for cooling the hot end and for part cooling.
The LDO kit that I purchased was intended for building an older version of these components... The extruder is known officially by Voron as Clockwork and the older toolhead/cooling unit known as Afterburner. The current version of the extruder is Clockwork 2, and Afterburner has been replaced by Stealthburner, although colloquially the whole print head is generally referred to as just Afterburner or Stealthburner. Stealthburner is supposed to provide improved part cooling over Afterburner, and they also incorporated LEDs into it for lighting the nozzle (useful if you are remote monitoring it via camera) and also the Voron logo will light up.
As I mentioned above, there was an upgrade kit for Stealthburner and CW2 included with my kit, so I will be using this version with some minor changes to accommodate some of the older version parts in the kit. Mostly this consists of a handful of altered printed parts to use the one piece toolhead PCB which simplifies the process of wiring. The toolhead PCB mod for Stealthburner uses a slightly different 2 piece PCB so LDO published altered .stls for a few of the parts along with build notes to allow use of the 1 piece PCB.
Here is the Clockwork 2 extruder assembled on the bench. The cabling cover hinges open for wiring access, as shown.
The E3D Revo Micro hot end being installed in the quick change tool head. There is a Voron specific version of this hot end which attaches with 4 M3 screws at the top, as opposed to the single M12 thread and nut that the micro uses. I went with the more generic hot end in case I decide to switch to a different hot end on the Voron; I can more readily use the Revo Micro on one of my other printers (upcoming Bear Exxa 2.0 uses the Micro). Performance should be the same either way. The only real disadvantage of the Revo right now (besides the proprietary nozzles) is it's a standard flow hot end, but they are supposedly coming out with a high flow version for even more print speed.
Assembled toolhead cartridge, ready to be installed. This can be swapped out of the printhead by removing 2 screws, loosening 2 others, and unplugging the wiring. This is in sharp contrast with the Prusas, which are a real pain to change anything out on the print head because usually you have to disassemble the whole thing.
Completed Stealthburner cooling unit/front cover; you can see the tool head LEDs here. The square fan is for cooling the hot end, and the other fan is for part cooling (i.e. to solidify the plastic as it is extruded onto the part). The part cooling fan you have to remove half of the housing, and grind down the mounting tabs for it to fit in the Stealthburner. The Voron development team has looked into getting a dedicated fan made, but it's apparently a lot cheaper to just modify a generic one.
Front view.
CW2 extruder and tool head installed on the X carriage.
Print head completed other than wiring connections. The next step on the build is to start installing the electronics components.
Edited to add; if somebody looks at these pictures who actually understands what they are looking at, they'll probably notice that I have the bed too far back here. Once I got the print head on it became obvious I had it in the wrong position, and I had somehow skipped the page that gave the dimension for locating the bed in relation to the frame. That's fixed now.