How TECHNAST Rebuilt Dentec’s Brittle PLA Hard-Hat Jig in TPU

Dentec did not need another copy of a failing jig. It needed the failure engineered out.

Dentec Safety Specialists came to TECHNAST with a recurring hard-hat tooling problem. Dentec reported that the PLA jigs it had been buying broke down too easily, forcing repeated replacement purchases for a production tool that needed to survive ordinary handling.

TECHNAST approached the job as an engineering problem—not a print order. We worked from the physical hard-hat shell, developed the geometry through scan and mesh data, refined the fixture through successive revisions, and selected the final material around the actual failure mode.

Project at a glance

• Customer: Dentec Safety Specialists, a Canadian safety-products manufacturer.
• Problem: brittle PLA hard-hat production jigs were breaking down and requiring replacement.
• TECHNAST workflow: physical-part inspection, scan-to-CAD development, iterative fixture design, material selection, printing, and fit verification.
• Engineering decision: replace rigid brittleness with dense TPU and controlled compliance.
• Demonstrated result: tooling that visibly flexes, recovers, and supports the physical shell.

The production context

Dentec manufactures the LIDGUARD head-protection line in Canada and publicly describes a high-speed custom-imprinting operation for its hard hats, with up to five colours and multiple imprint locations. Dependable support tooling matters in that kind of repeatable production environment, even when the fixture itself is never seen by the end user.

This Success Story concerns production tooling. TECHNAST did not design, certify, or modify the protective performance of the finished helmet.

Same geometry. Wrong material behaviour.

The existing PLA forms had already exposed the failure mode. The replacement needed to support the hard-hat shell, tolerate compression and removal, and recover instead of turning every flex or impact into a crack risk.

TECHNAST moved the design to dense TPU. The target was controlled compliance: firm enough to hold the form, resilient enough to deform under handling, and able to return to shape.

“You could play basketball with it.”

TECHNAST shop-floor shorthand for the fixture’s resilience—not a standardized impact rating.

What TECHNAST brought to the project

• Inspection before modelling: the physical shell and failed-tooling behaviour defined the real problem.
• Scan-to-CAD development: complex physical geometry became editable, reproducible digital tooling.
• Design iteration: successive versions refined support surfaces, openings, rim geometry, and handling features.
• Material selection by function: the fixture material was chosen around loading, flex, recovery, and shop-floor use—not familiarity.
• Physical verification: the finished tooling was checked against the real shell and demonstrated under compression.
• Digital continuity: the completed files preserve a controlled foundation for future reproduction and revision.

Built from the real shell, not a generic outline

The project archive documents the complete scan-to-CAD path: point-cloud and mesh captures, multiple Blender working files, STL and 3MF outputs, and successive fixture revisions. The actual shell geometry—not a nominal helmet profile—became the basis of the tool.

Successive prints refined the broad support surface, rim geometry, openings, and handling features. Multiple forms were produced to match the hard-hat geometries shown in the project media.

This is also an established industrial use of additive manufacturing: the U.S. National Institute of Standards and Technology identifies jigs and fixtures among additive-manufacturing applications. The value here came from combining that toolmaking approach with the correct material behaviour for Dentec's application.

The proof is physical

The video shows exactly what matters. The TPU forms are pressed and flexed by hand, then visibly recover. The hard-hat shell is positioned over and supported by the printed fixture.

Sound on: the video includes a narrated walkthrough of the project.

The demonstrated result

• Failure-led material selection: dense TPU replaced a brittle PLA strategy.
• Geometry-led fit: scanning and mesh development made the real shell the basis of the fixture.
• Visible resilience: the form can be compressed and flexed while recovering its shape.
• Reproducible local tooling: the completed digital files keep future production under control.
• Application-specific engineering: the jig was developed as a production asset, not sold as a commodity print.

No unverified lifetime multiplier is claimed here. The demonstrated result is a materially different tooling strategy: resilient additive-manufactured production support instead of repeatedly replacing brittle forms.

What this approach can unlock

The larger opportunity is not limited to hard-hat jigs. TECHNAST can apply the same inspect → capture → engineer → manufacture → verify workflow wherever a physical operation depends on tooling that is brittle, worn, poorly documented, unavailable, or no longer suited to the job.

• Production nests and assembly aids built around the real part instead of a generic envelope.
• Inspection and measurement fixtures that improve positioning and repeatability.
• Forming, trimming, masking, and support tooling tailored to the process and contact surface.
• Protective cradles and handling fixtures for finished, painted, curved, or delicate components.
• Variant tooling developed from a controlled digital master for different sizes or revisions.
• Obsolete or undocumented tooling reconstructed from the surviving physical part.
• Short-run manufacturing tools produced locally without committing immediately to conventional hard tooling.

Explore TECHNAST's 3D scanning and reverse-engineering workflow, engineering-led 3D printing, and obsolete-part recreation.

Why this work is timely

Ontario filed Ontario Regulation 112/26 on April 20, 2026, with the amended head-protection requirements scheduled to take effect July 1, 2027. Among the changes, Type 2 headwear is required where side-impact hazards are present, and a retention system is required where work conditions may dislodge the headwear.

Dentec has published its own practical overview of Ontario's new Type 2 hard-hat requirements. That regulatory change is separate from this fixture project, but it reinforces the importance of capable Canadian production systems behind protective headwear.

Related Dentec and Ontario resources

• Dentec LIDGUARD head protection and custom imprinting
• Dentec's Canadian-made LIDGUARD launch announcement
• Dentec's guide to Ontario's Type 2 requirements
• Official Ontario Regulation 112/26

Bring TECHNAST the problem—not just a print file

If a jig, fixture, nest, support, mask, or obsolete component is disrupting production, start with whatever evidence you have: the failed tool, the mating part, photos or video, existing CAD, critical dimensions, operating conditions, required quantity, and timeline.

TECHNAST can inspect the failure, capture the geometry, rebuild the design intent, choose a suitable manufacturing route, produce the first article, verify the fit, and preserve the resulting digital asset for controlled future production.

Start a TECHNAST tooling project →

Based in Markham, Ontario, TECHNAST supports manufacturers across Toronto, the GTA, Ontario, and beyond with 3D scanning, reverse engineering, CAD development, additive manufacturing, prototypes, fixtures, replacement parts, and short-run production.

We engineer the replacement around the job it actually has to do—and the possibilities that come next.