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The control PCB is located half underneath the bed at the back of the machine. It is cooled together with my raspberry pi kind of indirectly by a gigantic Noctua fan.

Some pros and cons:

  • looks neat
  • is very very quiet compared to stock
  • surprisingly easy access (the entire setup is screwed down into the platform, and the platform can be easily rotated 45 degrees to give decent access or 90 degrees to give excellent access)
  • only one stepper cable needed to be extended. Extensions to these involve 8 wire joinings, so the fewer of these the better.
    +overall cable management can be fairly neat, with the vast majority of stuff hanging out at the back not getting in the way but also not cut to exact lengths or fastened onto the frame in a manner that makes them a PIA to remove or modify later.
  • wire routing is a bit of an art - one of the stepper cables goes through the bed frame, for example, and another is taped down to the platform so it forms a sharp(ish) straight angle and lets the bed pass by it. There was a bit of trial and error moving the Y-axis back and forth to see if it was doing something untoward.
  • the big noctua fan needs to be positioned right so it both gives air circulation to the boards and does not cool down the poor heated bed beyond its heating capacity. The stock Tevo board is depressingly slow to heat up anyway, but ultimately I managed it so that it doesn't really get affected. The bed also does not appear to heat up the electronics, thanks to hot air rising up rather than falling down.

As an extra for repurposing an ATX power supply, as that's the other sort of unique thing about my implementation:
1) the LED strips actually serve to apply a load on the 5V rail of the PSU: without them, the thing goes into shut down the moment you draw current at 24V from it.
2) A non-modular PSU tends to have a cable management sleeve built into it. If you are willing to commit, you can steal it and use it for the X carriage wiring while cutting off and potentially sealing the rest of the cables you are not using. It is a good idea to keep several cables of each voltage around though, in particular, 2-3 wires for the 5V configuration. Strapping them together keeps the cables from overheating. For others, you will need power for a bunch of stuff (like that Noctua fan!) so you might as well use the cables that already come from the PSU.