this post was submitted on 29 Jan 2024
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As you might be aware BambuLab issued a recall for the BambuLab A1 3d-printer. In particular, the issue is the mains-voltage (230V AC) heat bed cable.

As a resolution, they offer two solutions:

  1. Ship the entire printer back to them and receive a replacement printer.
  2. They mail a new cable and you install it.

What BambuLab doesn't mention at all is the test according to EN 50678 (Verification of the effectiveness of protective measures of electrical equipment after repair). Unless you can perform this test I would recommend choosing the printer replacement.

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[–] [email protected] 2 points 9 months ago* (last edited 9 months ago) (1 children)

With lower voltage DC you can only set the house on fire. With high voltage AC you can set the house on fire and electrocute people. In a safety oriented company you'd try to limit the parts of the device carrying 230V (or, more generally: if your device has dangerous bits, you try to keep those bits in as few places as possible, as that limits teh amount of places you need to keep safe). Now obviously this has limits - like the mentioned bed size - but I don't think we're yet at a point where this should overrule safe design principles.

I haven't seen a bambu printer myself yet - but given that the cable is undersized and not protected against side effects from bed movement I'd bet they also skimped on on making everything carrying 230V safe - in which case this is a cheaper design. I'm reasonably confident that a safe 230V heating design for a printer that size would not give you noticeably cost savings over a DC design, if at all.

[–] [email protected] 2 points 9 months ago

I'm certainly not trying to vouch for the safety of Bambu's designs and am only coming at this from owning/building a 350mm^3 Voron 2.4 that uses mains voltage to heat its 8 pound 355mm x 355mm x 8mm bed. Granted, my 2.4 has a fixed bed and the A1 doesn't.