Title: Proposal for Quality Assurance: Transparency in Filament Delivery

Bambu Lab H2 Series
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or years, there has been ongoing discussion in the community regarding filament quality and unexpected moisture in newly delivered spools. My own systematic analysis of the last few weeks confirms these observations.

Instead of waiting for complex or expensive feature requests (like sensors in the printer), I have a pragmatic proposal for quality control: Moisture indicator cards.

Each spool should include a simple indicator card inside the vacuum packaging. The benefits are clear:

  • Transparency from the factory: The customer can see immediately upon opening if the filament is dry or requires drying. This applies to the entire assortment – from standard PLA to PETG, and especially for high-end technical materials like ASA or PAHT-CF.

  • Cost-efficiency: These indicators cost only cents and would significantly reduce the burden on support, as user errors and moisture-related complaints can be objectively verified immediately.

My goal is to create a reliable foundation for all users—whether beginner or pro—instead of ignoring the issue of ‘moisture out of the box.’ What do you think? Wouldn’t this be the easiest way for Bambu Lab to immediately increase customer satisfaction?

Vorschlag zur QualitÀtssicherung: Transparenz bei der Filament-Lieferung

Seit Jahren wird in der Community ĂŒber Filament-QualitĂ€t und unerwartete Feuchtigkeit bei neu gelieferten Rollen diskutiert – meine eigene systematische Analyse der letzten Wochen bestĂ€tigt diese Beobachtungen.

Anstatt auf komplexe, teure Feature-Requests (wie Sensoren in Druckern) zu warten, habe ich einen pragmatischen Vorschlag zur QualitĂ€tsprĂŒfung: Feuchtigkeitsindikatorkarten.

Jeder Rolle sollte eine solche Karte in der Vakuumverpackung beiliegen. Die Vorteile sind eindeutig:

  • Transparenz ab Werk: Der Kunde sieht sofort beim Auspacken, ob das Filament trocken ist oder nachbehandelt werden muss. Dies gilt fĂŒr das gesamte Sortiment – von Standard-PLA ĂŒber PETG bis hin zu hochwertigen technischen Materialien wie ASA oder PAHT-CF.

  • Kosten-Effizienz: Die Indikatoren kosten im Cent-Bereich und entlasten den Support massiv, da Fehlersuchen durch den Nutzer und Reklamationen aufgrund von Feuchtigkeit sofort objektivierbar sind.

Mein Ziel ist es, fĂŒr alle Anwender – egal ob Einsteiger oder Profi – eine verlĂ€ssliche Arbeitsgrundlage zu schaffen, statt das Problem der ‘Feuchtigkeit ab Werk’ zu ignorieren. Was denkt ihr darĂŒber? WĂ€re das nicht der einfachste Weg fĂŒr Bambu Lab, die Kundenzufriedenheit sofort zu steigern?

Thank you for the technical insights regarding moisture absorption. As a professional carpenter, I see a clear parallel to woodworking: You would never build with raw material from a sawmill that requires extensive on-site drying to prevent warping or movement. The supplier is responsible for delivering material that is ready for processing.

If we have to rely on drying filament ourselves after opening the package—investing our own time and energy costs—the issue of factory quality control is being shifted directly onto the user. This creates an economic burden for the customer that should be avoidable through transparent quality assurance.

Danke fĂŒr die fachlichen EinschĂ€tzungen zur Physik der Feuchtigkeitsaufnahme. Als gelernter Tischler sehe ich hier eine klare Parallele zur Holzverarbeitung: Man wĂŒrde niemals Rohmaterial vom SĂ€gewerk beim Kunden verbauen, das erst vor Ort aufwĂ€ndig nachgetrocknet werden muss, damit es nicht arbeitet oder sich verzieht. Der Lieferant ist hier in der Pflicht, ein verarbeitungsfĂ€higes Material zu liefern.

Wenn wir uns darauf verlassen mĂŒssen, dass wir das Filament nach dem Öffnen erst zeitaufwĂ€ndig und unter Einsatz unserer eigenen Energiekosten trocknen mĂŒssen, wird das Problem der QualitĂ€tskontrolle ab Werk eins zu eins auf den Anwender abgewĂ€lzt. Das ist eine wirtschaftliche Belastung fĂŒr den Kunden, die bei einer transparenten QualitĂ€tssicherung vermeidbar wĂ€re.

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A magic card that the layman will use to ask for a return if it says anything other then bone dry. Sounds like a nightmare.

3 Likes
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That’s an interesting perspective. However, this isn’t about a ‘magic card’ to enforce returns, but about transparency for the user. If the card shows the filament has absorbed moisture, I know I need to dry it before wasting time and material on a failed print. It’s a tool for self-help, saving both the user and support from unnecessary troubleshooting. My focus is on success and quality, not on nightmares for manufacturers.

Deutsch: Ein interessanter Einwand. Es geht mir dabei jedoch nicht um eine ‘Zauberkarte’ fĂŒr RĂŒckgaben, sondern um Transparenz fĂŒr uns Anwender. Wenn die Karte anzeigt, dass das Filament Feuchtigkeit aufgenommen hat, weiß ich, dass ich es trocknen muss, bevor ich Zeit und Material mit einem Fehlversuch verschwende. Es ist ein Werkzeug zur Selbsthilfe, das uns Nutzern Frust und dem Support unnötige Fehlersuchen erspart. Mein Fokus liegt auf QualitĂ€t und Erfolg, nicht auf ‘AlptrĂ€umen’ fĂŒr die Hersteller.

4

I have to disageee. As the previous poster said, I would also just send it back and buy elsewhere.

I would trust a spool WITH NO CARD more than I would trust a spool with a card that said it was wet. The cardless spool might print properly. The carded spool is guaranteed to fail the print.

5

Its a good idea for stock in physical stores; but in an online ordered world its not discoverable until it’s literally in hand; not gonna even function as a quality guard, only as a vector for returns

6

They would lose their ■■■■ in return shipping. Its a good idea, but I feel would result in massive costs for Bambu. Someone needs to come up with a clip on moisture level sensor, kinda like the color match sensor that was just released I forgot by who. It would be the best solution out side of AMS with active moisture detection.

7

Nope it won’t work. Humidity is locked in filament with polar bond (imagine positive-negative charge attracting each other). It’s only effectively weakened by heat because heat makes the molecules move away from each other, giving it a chance to escape from polar bond locking mechanism.

Filament can totally be wet while the air in bag is dry as Sahara.

1 Like
8

Thanks for the physical explanations and the constructive ideas. My original thought points in the exact same direction: We need reliable quality control directly on the material. Since moisture is bound in the filament due to polar bonds, the best solution would be for manufacturers to integrate a humidity sensor directly into the vacuum-sealed spool packaging at the factory. This would save users and Bambu a huge amount of effort regarding returns and would be the logical next step for serial quality assurance.

Danke fĂŒr die physikalischen ErklĂ€rungen und die konstruktiven AnsĂ€tze. Mein ursprĂŒnglicher Gedanke zielt genau darauf ab: Wir benötigen eine verlĂ€ssliche QualitĂ€tskontrolle direkt am Material. Da Feuchtigkeit aufgrund polarer Bindungen im Filament fest sitzt, wĂ€re die beste Lösung, wenn die Hersteller direkt ab Werk einen Feuchtigkeitssensor in die vakuumversiegelte Spulenverpackung integrieren wĂŒrden. Das wĂŒrde den Anwendern und Bambu enormen Aufwand bei Retouren ersparen und wĂ€re der logische Schritt fĂŒr eine serienreife QualitĂ€tssicherung.

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Regardless of how dry the air is inside the plastic bag, or aluminium bag, the water that is already in filament would not get out (at least not effectively)

10

The problem is that you don’t know what atmospheric RH in the interstitial volume corresponds to what percentage of moisture in the filament, the math is so complex you’d just need to determine it experimentally. And even so that would just give you a table for precisely that filament at some particular temperature.

11

To put what Hotellonely is saying in a different way – a low humidity reading inside a container with filament only indicates that the filament hasn’t (yet) absorbed all the moisture it can hold onto. Just like desiccant (but less absorbent, hopefully!). The container might be dry, but one doesn’t know how saturated the desiccant/filament is.

-Max

1 Like
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Even besides the fact that it could indicate the moisture level of the filament, that would only be valid until opening the package.

So a good indicator in a package of PA, would only be valid at the moment of opening. 12hrs later (possibly less in a high humidity environment), that wouldn’t say anything about the filament humidity anymore.

That is why most filaments have a disclaimer on the website saying: dry before use!

14

I tend to agree but I think I also fall into the more problems than it solves category. If anyone was buying filament in person, people might even open boxes to inspect the card to get the dryest filament.

On the manufacturing side, the way to prevent that is by using more expensive multilayer bags that block most water infiltration. That will generate more waste and increase costs.

Unfortunately for end users, it’s not a one time thing and end users have to dry filament - sometimes multiple times depending on conditions and circumstances. Even if users are presented perfectly dry filament from the manufacturer, poor storage and filaments getting exposed to air can start adding water back so users need to be able to dry anyway.

It’s not the best situation but kind of what we’re stuck with at least until something else changes. I doubt manufacturers will raise their prices to deliver more dry filament unless it’s some kind of boutique “ready to print” filament collection that carries a premium price. There doesn’t seem to be a rush to fill that need.

Added - For perspective on drying cost, I’m at 8 hours on a Bambu PETG Basic spool dry. I used my Kill-O-Watt in the power path on a Sunlu S2+ dryer and my aquarium pump used as part of the dry. Anyway, 8 hours running at 65C. The power draw has been 270 Wh for a cost of $0.06 at $0.25/kWh cost from the utility. It’s a single bay dryer for those unfamiliar for scaling.