And to that note - the fact that the instructions and/or the assembly doesn’t call this out to NOT do this - isn’t a fault of the user. Sure one would think (as I did) to never put something down on a wire where it could be bent. But the reality is that not everyone would do this.
And to the original post, this is not a user fault. Maybe Bambu believed that at first when they immediately offered refunds to the affected users and released the printed “fix” for everyone else, but they then went for the full recall. What changed? Clearly the sheer amount of affected users contacting them and inspection of brand new units in their warehouses. People have received damaged cables right out of the box so we can rule out “user error” as the primary cause. Bambus reaction also tells us this is more of widespread issue as more evidence comes to light.
Simply, the cable is is just not a suitable spec for the job. If a 240v cable is so easily damaged either in a well packaged box, from normal use, or even during assembly then it’s just not fit for purpose and needs replacing. I don’t believe the 0.1% figure for a second, no ones recalling 1,000s of these printers at such a great cost for an uncommon fault. All the printers have the same poorly constructed under spec cable so it’s just a matter of time before more start to fail (and we already see more reports of unstable heat beds since the recall here, on reddit and facebook).
The design flaw Is the extra angle of the cable with the length.
That constant bending work hardens the copper wires and over time single strains will start to break. After enough of them break that spot of the cable can handle significantly less current causing it to over heat. Every single A1 is effected and this is an extremely dangerous flaw. 100% of the units are effected and how Bambu reports issues they only post 10% of what the actual number is and they actively censor people and delete posts.
Honestly this is just the top of the shady iceberg with them.
Sorry, but I have to disagree with you.
Cables harden as they age and this can take several years and the A1 is not old enough for this to be possible.
The problem is more likely that the cable manufacturer has manufactured the highly flexible silicone cables with a sheath that is too rigid, which breaks at the housing exit due to the constant stress.
It is not known whether this was a BBL edition.
And BBL will only take back the devices or, if requested, replace the heating bed with cable so that everyone else doesn’t have to experience the problems that have arisen.
Unfortunately, I cannot accept your statement on this, as there is still the possibility that it is really only 10% that BBL states.
But to know for sure, you, me and everyone else would first have to see the sales figures and the amount of defective devices.
And so unfortunately I can only say that you can get excited until you turn blue because your assumptions are simply not proof.
Disagree all you want it won’t make you right. They don’t age. It’s called work hardening and I can take a copper wire 2 seconds after it’s manufactured bend multiple times and it will work harden and break.
Please do some basic research. Here I’ll help educate you.
The issue doesn’t seem to be the copper work hardening as beds would just stop heating if this was the case. The issue seems more that the interior sheath material is failing and causing a short.
Now you’re making a fool of yourself.
You don’t want me to believe that there has been no development in this area for 17 years and that the article from 2007 still exists today.
Then my Artillery Sidewinder X1 and every other 3D printer should already be on fire.
So you have to think of something better.
Because I come from the electronics sector.
Work hardening. This is a fact ask anyone with basic electronics knowledge or metallurgy knowledge. This is a fact.
Bend radius. Tighter the bend radius the faster it will work harden and the strains start breaking. It’s not an issue on other printers because they were designed right. Cable length and bend radius.
Cable length. If the cable was longer the bend radius would be larger and reduce this.
Wore gauge. Thicker wire = more stains. More stains = more that can break before you hit that point where the current is just too much and starts to overheat.
All of these work together to cause this failure but at the core of it the cause is work hardening due to a poor design .
Basically everything that could go wrong with a design did. And the result is this. If you changed one thing it would greatly reduce this effect.
Okay and BBL doesn’t know this and that’s why they sold us defective devices?
Or has the supplier made a mistake and BBL knows nothing about it.
Until it is clear exactly what the problem is, the information you provide is just speculation and I don’t believe in speculation.
And that’s the end of my conversation with you.
If you give me real proof, then I will believe your assumptions too.
