Cost Optimization Over Process Integrity — A Warning to Buyers

[Edouardh]

Summary

Formlabs’ transition from rigid powder cartridges to flexible powder bags is presented as a minor logistical improvement. In practice, it fundamentally degrades the Fuse ecosystem at multiple levels: process control, print reliability, operator safety, and environmental cleanliness.

This is not an isolated opinion — similar concerns are already widely documented by users:

• Powder Bag Demonstration - #89 by Mario_Martinez

• The New "Bags" of Powder - #183 by joe_eilert

This is not a marginal inconvenience. It is a structural regression.

1. The critical mistake: breaking the first contact with the material

This change may seem trivial. It is not.

The moment powder enters your workflow is the most critical control point in SLS.

Any contamination or instability introduced here propagates through the entire process and cannot be corrected downstream.

The previous system (jugs):

• Closed, controlled transfer

• Minimal exposure

• High repeatability

• Fast and efficient (~5 minutes, almost no pollution)

The current system (bags):

• Open handling

• Uncontrolled transfer

• High variability

• Significantly longer and more complex (4–5x slower)

Formlabs effectively moved a controlled industrial step into the user’s hands.

2. Increased contamination risk

With bags:

• Powder is exposed to ambient air

• Fibers, dust, hair, and static contamination become unavoidable

• Handling is less precise and repeatable

SLS is extremely sensitive. Even microscopic contamination can lead to:

• Surface defects

• Weak layers

• Print failures

This was not an issue before. It is now.

3. Airborne powder dispersion (underestimated issue)

The most concerning aspect is not convenience — it is air quality.

These bags contain ultrafine PA12 powder.

Every manipulation (opening, pouring, adjusting) releases particles into the air.

Even with precautions:

• I systematically wear a mask

• The Sift is used in glovebox mode

• Industrial filtration is in place (IQAir GC Multigas XE)

→ Pollution spikes still occur.

4. Measured data (real environment, controlled setup)

Despite a controlled setup, measurements show clear pollution events:

VOC (Volatile Organic Compounds)

• Baseline: ~150–250 ppb

• Peak: ~900–1000 ppb

• Sharp spike during powder handling

  

PM2.5 (fine particles)

• Baseline: ~0–1 µg/m³

• Peak: ~12–14 µg/m³

• Immediate rise correlated with manipulation

  

Interpretation:

• Short but intense exposure events

• Direct link to powder handling

• System inherently releases airborne particles

If this happens in a filtered environment with PPE, the situation is clearly worse in standard workshops.

5. Practical design flaw: impossible to fully use a bag

A very concrete issue:

• A 10 kg bag cannot be fully emptied into the Sift reservoir

• The reservoir capacity is smaller

• You are forced to:

  • partially empty the bag

  • then store an already opened bag of ultrafine powder

This creates:

• continuous contamination risk

• continuous leakage risk

• additional handling cycles (→ more airborne particles)

This alone contradicts basic industrial handling logic.

6. Structural issue with the design

The problem is not user technique.

The problem is the system:

• A flexible bag is inherently unstable

• Powder is no longer contained

• Each interaction reintroduces particles into the air

This is a regression from:

→ semi-closed industrial workflow

to

→ open, manual, contamination-prone workflow

7. Operational impact

This change introduces:

• 4–5x longer handling time

• More cleaning

• More variability

• More failure risk

A process that used to be:

→ simple, fast, and controlled

has become:

→ slow, messy, and stressful

It also forces users to:

• develop workarounds

• add unofficial tools

• invest in additional filtration

Users are compensating for a degraded design.

8. Health and safety concern

This point is not clearly addressed by Formlabs.

Repeated exposure to:

• ultrafine polymer particles

• airborne dust events

is not neutral.

Even with PPE and filtration:

• exposure still occurs

• peaks are measurable

Without such equipment, exposure is significantly higher.

9. Final note (personal, but representative)

This change was clearly driven by cost reduction.

From a user perspective:

• it degrades every step of the workflow

• it increases risk and effort

• it removes confidence in the system

Opening one of these bags has become something I actively avoid.

It used to be a non-event.

Conclusion

The switch to powder bags is not a neutral change. It is a cost-driven decision with systemic consequences.

It degrades:

• Process control

• Print reliability

• Cleanliness

• Air quality

And most importantly:

• It breaks the integrity of the material handling stage

If you are considering investing in the Fuse ecosystem:

Be aware that you are not buying the same level of system control that existed before.

[Andreasemilsson]

I dread the day Nylon 12GF no longer comes in jugs. They still do, fingers crossed.

[SMute]

I’ve not had any fiber or other foreign substance contamination as a result of the bags, at least not any that I notice. You can cut a hole in the bottom of the bag and transfer relatively securely directly into the grate by placing the bag on top of the grate, which minimizes powder escape. Excess powder can be managed through the sift to the cartridge, and then from the cartridge back into your choice of storage (I use some of the old jugs I have lying around). Someone posted a nice funnel design that interfaces with the cartridge and a jug.

I understand the frustration it just seems a bit blown out of proportion.

[Edouardh]

So your solution is to recondition the powder yourself?

That’s exactly the problem. A previously closed, controlled step is now pushed onto the user with extra handling and workarounds.

Needing funnels, transfers, and secondary storage just to get back to baseline usability is an obvious regression.

@SMute

I’ve not had any fiber or other foreign substance contamination as a result of the bags, at least not any that I notice. You can cut a hole in the bottom of the bag and transfer relatively securely directly into the grate by placing the bag on top of the grate, which minimizes powder escape. Excess powder can be managed through the sift to the cartridge, and then from the cartridge back into your choice of storage (I use some of the old jugs I have lying around). Someone posted a nice funnel design that interfaces with the cartridge and a jug.

[Ashwini]

May be on an unrelated note - During a recent visit to the local distributor’s office, I observed the Fuse 1 cleaning station on display and was concerned by its design. The unit includes an open slit through which users insert their hands to separate and clean parts. Although a HEPA filter is present inside the system, this configuration may still pose a safety risk. Fine polymer particles can adhere to hands and clothing, potentially spreading into the surrounding workspace. This contamination may not be immediately visible but could still present a health hazard. For a company capable of producing high-quality systems such as the Form Series and Fuse Series, this design oversight is difficult to justify.

( Reference Image - Google)

However, it appears that in more recent versions, the issue has been addressed. The updated design incorporates a fully enclosed glove chamber with integrated gloves and no open access points, which significantly improves containment and reduces the risk of particle exposure.

( Reference Image - New Fuse Ecosystem Improvements Make Producing Consumer-Ready SLS Parts Easier Than Ever | Formlabs )

[Morin3D]

We use the fuse without the glovebox and have no problems. The fan is strong enough to stop 99% of powder from escaping and it’s way easier to work with nitrile gloves than those big sandblaster ones. Pretty sure you can buy the glovebox separately too if you already have a sift and want it

[Ashwini]

Morin3D - The “99% capture” claim needs defined measurement criteria to be meaningful. Typical parameters would include:

• Particle size distribution

• Air velocity at the opening

• Capture efficiency during actual use

• Measured airborne concentration outside the system

Without these, the number remains anecdotal.

Fine polymer powders used in systems like Formlabs Fuse 1 often fall within the respirable range (<10 µm, frequently <4 µm). These particles:

• Stay suspended in air for extended durations

• Penetrate deeper into the respiratory system

• Settle on surfaces and clothing, enabling secondary spread

This aligns with known behavior under Particulate Matter.

Even small leakage fractions are relevant. A 1% escape rate is not negligible because:

• Exposure limits are defined at low concentrations (mg/m³ scale)

• Repeated exposure leads to cumulative effects

• Indirect transfer increases contamination beyond the immediate workspace

Guidelines from NIOSH and OSHA emphasize containment and engineering controls as primary protection, not reliance on airflow alone.

The issue is not usability preference. It is risk management hierarchy:

1. Elimination or containment

2. Engineering controls

3. Administrative controls

4. PPE

An open access slit relies heavily on airflow and user behavior. A sealed glovebox is a higher-order control because it physically isolates the hazard. Given the known behavior of fine powders and the limitations of open systems, it is reasonable to expect full containment in professional equipment.

Having said this - It is also positive that newer iterations address this through integrated glovebox systems and Formlabs also provide retrofit options.

[br4n_d0n]

Just like with the resin side of things where even if you don’t smell anything, that doesn’t mean there isn’t anything harmful in the air. This is why you should always wear appropriate PPE.

In the case of powder, @Ashwini is correct and it is actually more hazardous and takes extra care to properly handle. @Morin3D just because you don’t notice anything doesn’t mean that it isn’t a problem.

[CARLAYERS]

Formlabs has conducted a relevant test study on this topic with detailed test data.
When printing standard PA12 with careful, normal handling, I see absolutely no problems here.

-ENUS-Safety-with-Formlabs-SLS-Products-Air-Quality-and-Dust-Hazard-Analysis.pdf

Just for reference, we keep our Fuse, Sift, and sandblaster in a separate room, away from other printers and workstations, but right next door.
A full row of windows can be opened for ventilation. There is no separate exhaust system.
When working with powder, an FFP3 mask is worn. This includes cleaning/maintaining printers, refilling powder, and cleaning/maintaining the vacuum cleaner.
Our Sift was operated with the box extension for a while, but we removed it again because it simplifies the workflow.

I know that for better protection, I should wear a mask for all work in this room, but I often don’t do this when I’m just working on the Sift.

Based on the data collected by Formlabs, I don’t see a need for more extensive protective measures beyond a separate room and an FFP3 mask.

[Ashwini]

A relevant study. Thank you for sharing.

I reviewed the document in detail. A key point for interpretation is the environmental context defined in the study by Formlabs. The facility conditions include controlled ventilation, with at least three air exchanges per hour and, in some cases, additional exhaust support. The conclusion that no special respiratory PPE is required applies within those controlled parameters, alongside consistent housekeeping and standard handling practices. This establishes a boundary condition.

The findings are directly applicable only when equivalent engineering controls are present. In the absence of defined air exchange rates and controlled airflow, exposure conditions can differ significantly. From an exposure control standpoint, polymer powders such as PA12 are typically considered low toxicity, but the primary concern remains respirable particulate exposure. Risk is governed by concentration and cumulative duration, not immediate acute effects.

Therefore, a preventive approach is more appropriate than a permissive one. Consistent use of respiratory protection and inbuilt mechanisms to contain/limit powder interaction at all stages reduces uncertainty and aligns with standard industrial hygiene principles.

At the same time, the study remains useful. It demonstrates that under controlled conditions, the Formlabs Fuse Series ecosystem can operate within acceptable air quality limits, and that engineering controls are effective when properly implemented. As a prospective buyer of Fuse it is reassuring to know there are studies and guidelines set by Formlabs.

@Edouardh apologies for side railing the conversation. I do sincerely hope your valid concern is addressed by Formlabs.