Physical stock or a 3D file? Learn how to select, qualify and manufacture certain industrial plastic parts on demand in Algeria.
A maintenance storeroom does not necessarily hold every part a factory will need. For certain plastic parts, the solution may be to retain a validated manufacturing dossier and produce the part only when it is needed.
In a production workshop in Oran, a small plastic part can have disproportionate consequences: a broken cable guide, an unavailable cover or a specific spacer can sometimes be enough to complicate the return of equipment to service.
When a part is old or rarely requested, its availability from the supplier can become just as important as its price.
On-demand additive manufacturing, combined with a digital inventory of qualified parts, offers an approach that complements the traditional storeroom.
The idea is not to replace everything with 3D printing, but to select the right parts, prepare their manufacture and avoid repeating the engineering study whenever a need arises.
A physical inventory contains parts ready to be fitted.
A digital inventory retains the information needed to reproduce certain parts under controlled conditions: CAD model, revision, material, relevant manufacturing parameters, inspections and operating conditions.
The distinction matters.
An STL file essentially describes triangulated geometry. On its own, it provides no information about the original material, functional tolerances, loads or safe use.
A 3D model therefore becomes a true inventory item only when it is accompanied by a technical dossier suited to its function.
In practice, the strongest solution is often hybrid: keep standard, urgent or critical parts physically in stock, while preparing digital manufacturing for a selection of specific components that are rarely used or have become difficult to obtain.
Formlabs also describes this complementary approach in its guide to digital inventories. Formlabs — spare parts management and digital warehousing
In March 2025, Würth Additive Group launched a first version of its Digital Inventory Services platform.
The platform enabled the management of part data, access rights and validated manufacturing processes, with particular attention to traceability and intellectual property.
In November 2025, its partner IMS reported that more than 100 clips and fasteners had been digitised, qualified and uploaded to the system.
These components provide a particularly interesting example for automotive and industrial maintenance. Würth — announcement of the first edition of DIS, 31 March 2025, IMS — experience report, 6 November 2025
This is a historical example: Würth Additive Group announced its closure in 2026.
Siemens Mobility describes a virtual warehouse containing more than 2,100 different part references and reports having sold more than 31,000 printed parts to railway industry customers.
This activity covers different processes and materials, with engineering, inspection and, where necessary, certification stages. It is therefore not limited to plastic FDM printing.
The group uses digital data, in particular, to maintain the availability of certain parts that have become obsolete. Siemens Mobility — 3D printing of railway spare parts
These examples illustrate an essential principle: digital data is most valuable when it enables a part to be manufactured again in conformity with an identified use.
However, they provide neither a lead-time guarantee nor a promise of savings that can automatically be applied to an Algerian SME.
The relevant question is not simply:
“Can this part be printed?”
Instead, ask:
“Is manufacturing it on demand useful, technically acceptable and economically worthwhile?”
A university study appearing in a January 2026 issue, examining spare parts at a large paper mill, estimated that around 1% of the part references analysed had real potential for additive manufacturing within the scope of the study.
The authors also stress the importance of having local suppliers capable of producing the selected components.
This percentage cannot be applied to every industrial sector. Above all, it is a reminder that rigorous selection is better than indiscriminate digitisation. Cardeal, Ribeiro and Leite — study published in the Journal of Manufacturing Technology Management, volume 37, issue 2
| Type of part | Potential benefit | Priority check |
|---|---|---|
| Non-critical cap, cover or guard | Sometimes an old part, needed in small quantities | Temperature, exposure and safety |
| Cable guide or sensor bracket | Specific geometry, local adaptation | Fastening and vibration |
| Spacer or positioning part | One-off manufacture may be worthwhile | Loads and dimensional stability |
| Non-critical polymer wear component | Occasional reproduction may be feasible | Abrasion, service life and validation |
| Heavily loaded safety component | Generally unsuitable for a simplified replacement approach | Specific qualification and authorisations |
Material is one variable among others.
ABS, PETG, ASA, nylon, PC or TPU must be selected according to the available grade, geometry, environment and required testing.
No polymer designation, on its own, guarantees that a part meets its requirements.
Creating a reliable digital part reference requires several operations.
Identify the part and understand how it is used. The equipment concerned, important dimensions, loads, known or assumed material and consequences of a possible failure must be documented.
Check reproduction rights. An original part is sometimes still the best option. Reproduction must comply with applicable requirements, intellectual property rights and any contractual restrictions.
Obtain usable geometry. A technical drawing or CAD file can serve as a starting point. When these are unavailable, dimensional measurement, a 3D scan or geometric reconstruction may be considered.
A scan does not, however, automatically recover the designer’s intent, tolerances or properties of the original material.
Choose the process and material. For certain plastic components, FDM/FFF printing is an attractive option in small quantities.
Mechanical, thermal, chemical and dimensional constraints must be studied before manufacture.
Manufacture and qualify a first sample. The prototype must be inspected against its functional characteristics.
Representative testing may be needed to verify its suitability for the intended use.
Build the reference digital dossier. Once the part has been validated, the files, important parameters and inspection results are archived under an identifiable part reference.
Reproduce the part with verification. When a new request is received, the manufacturer checks the version, material and production conditions before starting manufacture.
This method builds on work already completed without removing the need for inspections.
The ISO/ASTM 52920:2023 standard provides a reference framework for the qualification and quality assurance of industrial additive manufacturing processes. However, following its principles does not automatically certify a part or a workshop. ISO — ISO/ASTM 52920:2023
A parts library should do more than make it possible to find a 3D model.
It should provide enough information for the part to be understood and reproduced under controlled conditions.
| Information | Purpose |
|---|---|
| Part reference and equipment concerned | Avoid confusion |
| Function and criticality level | Define requirements |
| Native CAD and STEP files, if available | Enable modifications |
| Manufacturing file and revision | Reproduce the correct version |
| Material and grade | Document the selected material |
| Key manufacturing parameters | Improve repeatability |
| Dimensions and inspection criteria | Verify conformity |
| Testing and validation history | Ensure traceability |
| Access rights and backups | Protect data |
This organisation can begin with a structured register and properly versioned folders.
A more advanced platform can later automate searches, manufacturing requests and maintenance intervention histories.
A locally printed part may cost more per unit than a moulded part produced in a large series.
That does not necessarily make it a poor solution.
The economic analysis must compare both supply methods across their full costs.
For a traditional order, consider the part price, transport, minimum order quantities, storage and delivery lead time.
For additive manufacturing, consider modelling, the prototype, testing, material, manufacture, inspection and any replacements.
When machine availability is at stake, the company must also examine the economic consequences of waiting.
The right indicator is the time between identifying the need and having a technically accepted part available, rather than printing time alone.
The economic case must be calculated using real data specific to the company.
Consider an illustrative case, which is not presented as work carried out by ON3D Lab.
A packaging company owns an old production machine.
A small plastic bracket used to hold a sensor is damaged. The original part is difficult to obtain quickly.
The maintenance department provides the existing part, available dimensions and information about its use.
After verifying that it has no safety function and that the necessary rights are in place, a service provider studies its geometry.
A first version is modelled and then manufactured in a material suited to the observed conditions.
The technical department checks the fit, dimensions and actual use.
If the results are satisfactory, the model is archived with its part reference, material, manufacturing conditions and inspection results.
When another part is needed, the company can start from this dossier rather than repeating the entire engineering study.
This method does not remove the need for inspections. A change in geometry, material or operating conditions may require renewed validation.
For manufacturers in western Algeria, this approach is particularly relevant when it combines the maintenance department’s knowledge, an engineering office’s skills and a local additive manufacturing workshop.
A digital inventory is not a universal solution.
It depends on the availability of materials, manufacturing equipment, skilled people and technical data.
Files must also be protected against loss, unauthorised changes and inappropriate access.
A printable part is not necessarily a suitable substitute for an original part.
Components involving safety, heavy loads, pressure, electricity or regulated environments require specific assessments.
Chemical resistance, thermal performance, wear and ageing cannot be established through a simple fit test.
A credible approach is therefore to start with a few plastic parts of low criticality, using reproducible inspections and a documented comparison of costs and lead times.
A digital inventory is not a library of STL files to print indiscriminately.
It is a technical memory of selected parts, linking their function, design, manufacture and validation.
For an industrial SME in Algeria, the benefit is practical: prepare the reproduction of certain plastic parts, reduce supply uncertainties and make better use of the knowledge gained from maintenance interventions.
Physical stock remains essential when urgency, safety or production requirements justify it.
At ON3D Lab in Oran, we support the engineering, modelling and manufacture of custom technical plastic parts.
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