Unfortunately, I think the best we can do here is to offer a refurbished replacement at reduced cost on exchange. Please contact email@example.com to enquire about availability and include a link to this thread.
@c310 the change from previous versions to v2.0 was to increase the strength of the magnet which has allowed us to have more confidence in users printing there own housings. We may bring out a assembled version with a housing if we can get the housings manufactured at a reasonable cost. but we are not planning on changing anything functional with the design.
I think the confusion is the PCBs are version 1.7b, its just the magnetic assembly that is now v2.
Our European resellers should have stock of this as a kit - if your favourite reseller does not then please encourage them to stock up 😄 (I just checked a few (1,2,3) and they did have stock).
Believe or not, people in a lab I work can populate similar things without reflow or paste mask. Yes one board takes one day
I've done that in the past myself, but we had a vapor phase oven and a manual pick and place machine. But I can't imagine populating a bord without having solder paste applied (with a paste mask)
Trying to place a 0401 capacitor with plyers ends up in crawling under the desk and trying to find the lost components 😉
First off, a quick description of what a tool is, because that's what you'll have - 4 tools. Essentially a tool consists of an extruder, a heater and a temperature sensor. There is also usually a heat sink cooling fan but this is associated with a heater/temperature sensor so it's not strictly part of a tool. Optionally there will be a part cooling fan and you'll likely have one per tool.
So you need to connect 4 heaters, 4 temperature sensors, 4 hot end cooling fans, 4 extruder motors and optionally up to 4 part cooling fans (you could maybe use one fan per pair of hot ends (tools)). There are also things like end stop switches and/or Z probes to think about.
You've got a couple of options - either the expansion board or what might be a better option would be to use tool boards for each extruder. It all depends on where you plan to mount the extruders. If you use a single expansion board, then you'll need to connect one tool (heater, temp sensor, heat sink fan and extruder motor) to the main board and the other 3 tools to the expansion board. So all the wiring will go to either of two central points (the main board or the expansion board).
What might work better would be to use tool boards instead of the expansion board. That would allow you to mount each tool board close to each extruder for example. Of course you'll still need to run wires from each tool board to each heater/temp sensor/fan etc. Alternatively, you could mount tool boards on the carriage. This would make wiring the heaters, sensor,fans etc a lot easier and neater but of course, you then have longer runs of cable from the tool boards to the extruders motors. Having tool boards on the carriage might also simplify connecting a Z probe but check the list of firmware limitation here https://duet3d.dozuki.com/Wiki/Duet_3_firmware_configuration_limitations
Actually, there is a third option which is to use Duet 2. So you'd need the Duet Ethernet or Wi-Fi plus the Duex5. But in this case, all the wiring has to go back to a central point because the Duex5 has to be very close to the main board.
Edit. I've only recently started to use YouTube more. There is a lot more stuff in my blog if you haven't already seen that (link n my signature).