Selective laser sintering runs just below the melting point of the polymer – and at those temperatures, oxygen degrades your powder before it ever becomes a part. An inert nitrogen atmosphere prevents it. FLAIRMO nitrogen generators deliver 99.5 – 99.9995 % purity on-site, from a cabinet that fits beside the printer.
Recommended products
SLS printing demands an uninterrupted nitrogen supply for the full length of every build — and these generators deliver exactly that. Most SLS processes require 99.5 to 99.9 % purity depending on the material; Flairmo generators reach up to 99.9995 %, leaving headroom for filled and colour-critical grades.
A compact nitrogen generator for benchtop SLS 3D printing - our standard recommendation for the Formlabs Fuse 1+ 30W on 110 V installations. Self-contained and ready to run without an external air supply.
The most widely installed nitrogen generator in our SLS range and our standard recommendation for the Formlabs Fuse 1+ 30W on 230 V, with headroom above the printer's 14 l/min requirement.
A high-capacity nitrogen generator with a built-in compressor — suited to the Formlabs Fuse X1 or to running up to three Fuse 1+ 30W printers from a single unit.
A production-scale nitrogen generator for SLS cells running several printers side by side, or for shortening chamber purge times with a buffer tank. Connects to an existing compressed air supply.
IMPORTANT to mention! Every SLS installation is different. If your printer requires a different flow rate, purity level, or an external air supply connection, explore our full range of nitrogen generators to find your match here.
In selective laser sintering, the build chamber is held just below the melting point of the polymer for the full duration of the job - often many hours. At that temperature, oxygen is not a neutral bystander. It drives oxidative reactions in the polyamide powder that change how it behaves long before you can see anything wrong with it.
Replacing the chamber atmosphere with nitrogen removes the oxygen from the equation. The result is powder that survives more thermal cycles, parts that behave the same from build to build, and a process that stays predictable as volume increases.
Unsintered powder is recovered and blended back into new material. Oxidation shortens how many cycles it survives - and refresh rate is the largest running cost in SLS.
Oxidised powder sinters less predictably. Nitrogen protects tensile strength and elongation at break across the full build.
White and natural polyamides discolour under residual oxygen long before any mechanical property shifts.
A stable inert atmosphere reduces orange-peel texture and inconsistent layer fusion.
Reducing oxygen concentration lowers the risk associated with fine combustible powder in a heated, enclosed volume.
SLS does not demand extreme purity, but it does demand consistency. The requirement is dry, oil-free nitrogen at a stable flow - delivered without interruption for the full length of a build.
A minimum of 99.5 % nitrogen covers most SLS processes. Filled and white polyamide grades typically require 99.5–99.9 %. The requirement follows the material, not the machine — see the material guide below.
99.5–99.9 % N₂SLS printers have two distinct nitrogen demands: a high, short purge at the start of the build, and a low, continuous flow to maintain the atmosphere throughout. Sizing correctly means accounting for both.
Two-phase demandInlet pressure requirements vary between manufacturers, typically from 2.5 to 5 bar. Formlabs specifies 3.45 bar (50 psi) and a minimum gas temperature of 18 °C at the inlet.
2.5–5 barOil mist or moisture in the nitrogen stream has no place in a heated powder bed. All FLAIRMO generators include integrated oil-free compression, drying and filtration as standard.
Zero-contamination standardPowder grades
A common assumption is that the printer sets the purity requirement. In practice, the material does. The same machine may need a different atmosphere depending on the grade you have loaded.
| Material | Minimum N₂ purity | Notes |
|---|---|---|
| Nylon 11 (PA11) | 99.5 % | Standard grade |
| Nylon 11 White (PA11 White) | 99.5 % | Monitor for discolouration at the lower limit |
| Nylon 12 White (PA12 White) | 99.5–99.9 % | Colour-critical |
| Carbon fibre filled (PA11 CF) | 99.5–99.9 % | Filled grade |
Always confirm against your material datasheet and your printer manufacturer's specification. Where the two differ, follow the stricter of the two. On a PSA generator, purity and flow are linked — specifying 99.9 % from the outset is considerably cheaper than discovering a shortfall after installation.
How it works
Most nitrogen specifications for SLS printers quote a single flow figure. Your printer has two very different demands, and confusing them is the most common sizing mistake we see.
Purge flow is a burst: the chamber has to be flushed from ambient air down to the target oxygen level before the build can start. Maintenance flow is what follows - a low, continuous supply replacing what is lost through leakage and the powder bed itself, for the entire duration of the job.
Size only on maintenance flow and your purge takes uncomfortably long. Size only on purge flow and you buy a generator that spends almost all of its life at a fraction of its capacity. A correctly sized buffer tank resolves both: a modest generator accumulates nitrogen between builds and releases it quickly when the chamber needs flushing.
100+
Generators delivered
Supplied for SLS printer installations worldwide, across all printer brands.
3–12
Months to breakeven
Against bottled nitrogen supply, depending on print volume and local gas prices.
10+
Years sieve lifetime
The carbon molecular sieve at the core of every unit, with simple annual servicing only.
Below are the SLS printers we currently hold confirmed nitrogen data for. We add machines to this list as we verify them.
These installations show a typical SLS nitrogen setup. The generator sits in the same room as the printer, connected by a single nitrogen line — no plant room, no piped infrastructure, and no structural modifications.
The integrated oil-free compressor means there is nothing else to install and nothing else to service. Power and a nitrogen line are all that is required, which is why these systems go in without disrupting an existing print workflow.
Cylinders vs. on-site
Most SLS operations start on cylinders or dewars. It works until it doesn't — and what usually breaks it is not the gas price, but everything around it.
Rental fees, delivery charges and the residual gas left behind every time a cylinder goes back.
A cylinder running out mid-build costs far more than the gas ever did.
Varies between deliveries and degrades as the cylinder empties.
High-pressure storage, manual changeovers and dedicated safety procedures.
A known capital cost, then electricity. No rental, no delivery, no residual loss.
Nitrogen produced continuously, 24 hours a day, 7 days a week.
Stable and consistent throughout the service life of the unit.
The generator stands beside the printer and produces nitrogen from ambient air.
Why Flairmo
FLAIRMO nitrogen generators are designed and manufactured in Denmark. Every aspect of the build is controlled in-house - electronics, tank, valves and tubing - using components sourced through long-term agreements with documented manufacturers.
We size the system to your actual materials, build pattern and production volume — not to a model number.
Full control of the build, from electronics to tubing, with components sourced through long-term supplier agreements.
Every generator in this range includes a built-in oil-free compressor, dryer and filtration. No external compressed air supply required.
The carbon molecular sieve at the core of each unit is designed for 10+ years under normal operating conditions, with simple annual servicing.
Questions
Still unsure after reading? Send us the nitrogen specification from your printer manual and we will size a solution.
Contact us for a free recommendationMost SLS processes specify a minimum of 99.5 % nitrogen. Filled and white polyamide grades such as PA12 White and PA11 CF are typically run at 99.5–99.9 %. The requirement follows the material more than the machine.
Yes, provided the combined flow and pressure requirements fall within the generator's output. Three Formlabs Fuse 1+ 30W printers are typically covered by a single N2G-40CS. Larger or mixed fleets are usually best served by an external-supply generator with a buffer tank.
For a printer in regular use, yes. The generator has a known capital cost and runs on electricity, while cylinder supply carries recurring gas, rental, delivery and handling costs that scale with usage. Most SLS installations reach breakeven within 3 to 12 months.
FLAIRMO generators require simple annual servicing. The carbon molecular sieve is designed for 10+ years of operation under normal conditions.
Yes. Send us the nitrogen specification from your printer manual and we will size a solution. We add verified printers to this page as we confirm them.
Tell us which printer you run and which materials you print, and we will confirm the right model for your setup, flow requirement and installation environment - at no obligation.
Last updated: October 18, 2021
This Privacy Policy describes Our policies and procedures on the collection, use and disclosure of Your information when You use the Service and tells You about Your privacy rights and how the law protects You. We use Your Personal data to provide and improve the Service. By using the Service, You agree to the collection and use of information in accordance with this Privacy Policy.
The words of which the initial letter is capitalized have meanings defined under the following conditions. The following definitions shall have the same meaning regardless of whether they appear in singular or in plural.
For the purposes of this Privacy Policy:
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When You access the Service by or through a mobile device, We may collect certain information automatically, including, but not limited to, the type of mobile device You use, Your mobile device unique ID, the IP address of Your mobile device, Your mobile operating system, the type of mobile Internet browser You use, unique device identifiers and other diagnostic data.
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The Company may use Personal Data for the following purposes:
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We may update Our Privacy Policy from time to time. We will notify You of any changes by posting the new Privacy Policy on this page.
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You are advised to review this Privacy Policy periodically for any changes. Changes to this Privacy Policy are effective when they are posted on this page.
If you have any questions about this Privacy Policy, You can contact us:
By email: info@flairmo.dk
By phone number: +45 53 71 72 20
Last updated: October 18, 2021
1.1. Buyer’s acceptance of the offer from FLAIRMO ApS shall also mean acceptance of the General Conditions of Sale and Delivery set out below, which shall apply to the extent they are not deviating from any agreement in writing between the parties.
2.1. Information relating to technical specifications and prices indicated in manuals, leaflets, circulars, advertisements etc. are indicated as guidelines.
2.2. FLAIRMO ApS reserves the copyright and property of drawings, technical information, etc. submitted in connection with offers/contracts,
and of patents, trademarks, name of products, referring to the products sold FLAIRMO ApS.
2.3. FLAIRMO ApS reserves the right to modify the construction and technical specifications without notice.
3.1. In case inspection, and/or tests are required, these will be carried out at the plant in Aalborg, and the costs for such inspection shall be borne by the buyer.
3.2. In case approvals – other than those already carried out by FLAIRMO ApS – are required, the buyer shall give all necessary information and assistance, and he shall bear the corresponding costs.
4.1. The time indicated for delivery is the date at which the product are shipped from the plant in Aalborg. In case of delay, due to reasons other than those mentioned under Article 8 “Reliefs”, FLAIRMO ApS shall forthwith inform the buyer, and state the new date of dispatch, without this giving the buyer right to compensation or to cancel the contract.
4.2. In case the buyer anticipates that he will be unable to accept the delivery of the products, he shall forthwith inform FLAIRMO ApS, stating a new date for the delivery. In case the buyer fails to accept the delivery for reasons other than those mentioned under Article 8 “Reliefs”, FLAIRMO ApS shall be entitled to compensation for the loss suffered by reason of the buyer’s default.
4.3. Terms of delivery are Ex-works (EXW)
4.4. The risk shall pass in accordance with the International Rules for Interpretation of Trade Terms (INCOTERMS) in force at the date of formation of the contract. In case of EXW delivery, the risk will pass not later than when the products are handed over to the first carrier.
5.1. The payment shall be made according to the terms agreed between the parties. Where it is agreed that any part of the purchase shall fall due for payment only after the delivery, the buyer shall take out the usual transport insurance in respect of the products sold, for full value, and maintain such policy in force until payment has been made in full.
5.2. The goods shall remain the property of FLAIRMO ApS until payment has been made in full. In the case of delayed payment by the buyer, FLAIRMO ApS is entitled to charge interest for default, at a rate of 9 percentage points above official rate of discount of the Denmark’s National Bank.
5.3. In the event that after entering the contract, or after issuing the price list, custom export/import duties or other additional charges or costs directly caused by Government measures taken in Denmark or abroad, are imposed on raw materials, machinery components, etc. required for the performance of the contract – or in case collective bargaining results in increases in wages for instance, the buyer shall be liable to pay such increase over and above the price agreed.
5.4. Where the purchase price is agreed in a currency other than EURO, FLAIRMO ApS shall be entitled to adjustment of the purchase price in the event of any alteration to the rate of exchange of the agreed currency relative to EURO.
6.1. FLAIRMO ApS shall not be liable for any damage to property caused by the products after they have been delivered and whilst they are in the possession of the buyer. Nor shall FLAIRMO ApS be liable for any damage to products manufactured by the buyer, or to products of which the FLAIRMO products form a part.
6.2. If FLAIRMO ApS incurs liability towards any third party for such damage to property as described under 6.1. the buyer shall indemnify, defend and hold FLAIRMO ApS harmless.
6.3. FLAIRMO ApS and the buyer shall be mutually obliged to let themselves be summoned to the Court of Aalborg, Denmark examining claims for such damages.
6.4. The limitation of FLAIRMO ApS’s liability in 6.1. above shall not apply where FLAIRMO ApS has been guilty of gross negligence.
6.5. Save as elsewhere stated in these conditions, there shall be no liability for either party towards the other party for loss of production, loss of profit, loss of use, loss of contracts or for any consequential, economic or indirect loss whatsoever.
7.1. Provided that the operational instructions have been carried out, and unless otherwise agreed, the duration of the guarantee is the period stipulated for each type of products, calculated from the date of shipment from the plant in Denmark. The guarantee applies to any faulty material or workmanship in new material.
7.2. Any guarantee claim will only be accepted if the claim is given in writing according to the procedure set up by the Quality Control Department of FLAIRMO ApS.
7.3. Normal wear and tear or deterioration shall not be termed as “defect”.
7.4. Modifications carried out by the buyer, without prior agreement in writing from FLAIRMO ApS, damages caused by violence, misuse, lack of repair and maintenance, incorrect repairs or use of unoriginal spare parts/oil, are not covered by the guarantee.
7.5. Costs of transportation of parts/equipment, travelling expenses/wages of the buyer´s technicians, are not covered by the guarantee.
7.6. On receipt of the claim, FLAIRMO ApS shall forthwith send replacement or repaired parts/equipments.
7.7. In case the replacement parts/equipment are shipped prior to the returning of the defective parts/equipment to FLAIRMO ApS, these will be invoiced – and credited in case the claim is accepted under the guarantee.
7.8. In case the defective parts/equipment are returned to FLAIRMO ApS prior to the replacement/repair, these parts/equipment shall be repaired or replaced, and returned to the buyer, free of charge (except 7.5. above) in case the claim is accepted under the guarantee.
8.1. Industrial disputes, fire, mobilisation, requisition, embargo, currency restrictions, insurrection, strike, lock-out, shortage of transport, general shortage of materials, restrictions in the use of power or other circumstances which are beyond the control of the parties, shall be considered as cases of relief, in case they intervene after the formation of the contract, and impede its performance.
8.2. The party wishing to claim relief by reason of any of the mentioned circumstances, shall notify the other party in writing without delay, on the intervention and on the cessation thereof. The right of suspension of the contract shall only apply in case the effect of above reliefs could not have been foreseen at the time of the formation of the contract.
8.3. If Force Majeure prevents the buyer from fulfilling his obligations, he shall compensate FLAIRMO ApS for expenses incurred in securing and protecting the products.
8.4. In case the performance of the contract is suspended more than six months due to the conditions named under 8.1. above, either party shall be entitled to terminate the contract by notice in writing to the other party.
9.1. The Danish Law shall govern any question that might arise in connection with the business between FLAIRMO ApS and the buyer.
9.2. Danish Law shall determine any conflict. The court in Aalborg, Denmark shall settle any dispute.
If you have any questions about Terms & Conditions, You can contact us:
By email: info@flairmo.dk
By phone number: +45 53 71 72 20
