Problems
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Is it normal that the green connector of the bed and psu wiggle a tiny bit?
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Do you mean when tightening the screws.. if so, yes, hold them with one hand while tightening the screws.
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@jakob yes they do wiggle a little when tightening the screws. As @airscapes suggests, it's bets to hold them.
Very occasionally we see a failed solder joint on these terminals. So to be safe, you might like to inspect the underside of the board and check that the soldering of those terminal blocks looks good.
On later Duets we use barrier strips instead of terminal blocks.
