3D printed blow moulds and BLOWSCAN: why speed alone isn't enough in PET bottle development
In today's fast-paced FMCG market, brands face relentless pressure to bring new packaging to market quickly, making rapid prototyping a standard practice. But as BMT CEO and co-founder Yannis Salomeia puts it: "Speed alone isn't enough. Designs must be optimised to ensure top bottle performance and deliver an exceptional consumer experience."
In our recent article for PETplanet Insider, BMT showcased how SMART Prototyping with BLOWSCAN, combined with 3D printed moulds, lets converters move confidently from virtual validation to real-world results, without compromising on the performance data that matters.
Still relying on trial-and-error for packaging design?
Traditional bottle development relies on production tooling to validate a design, an approach that's slow, expensive, and offers limited room to iterate. 3D printed moulds change that equation by giving teams a fast, low-cost way to physically test a design at lab scale. But a fast prototype is only useful if it tells you something true about how the bottle will actually perform in production.
That's the question BMT set out to answer: how closely does a bottle blown using a 3D printed mould actually match one produced using full production tooling?
The data behind the claim
BMT compared bottles produced using 3D printed moulds against equivalent bottles produced using standard production tooling, assessing dimensional accuracy, mechanical performance, and material distribution. The results showed remarkably close alignment:
Top-load performance was just 2.3% lower for the 3D printed-mould bottle — well within acceptable production tolerances
Mechanical testing of sidewall samples showed axial and hoop modulus differences of only 7% and 1% respectively
Wall thickness difference between the two was minimal — just 2.5% on average
Maximum diameter and bottle length were identical between the two methods, indicating no difference in shrinkage post-demoulding
These findings confirm that BMT's 3D printed mould technology can reliably produce bottles that mirror production-grade quality, giving packaging teams genuine confidence in prototype data, not just prototype speed.
How BLOWSCAN makes it work
3D printed moulds integrate directly with BLOWSCAN, BMT's lab-scale stretch blow moulding machine, enabling fast turnaround and rapid design iteration while generating the performance data needed to guide final production decisions. Small batches of bottles are produced under controlled conditions, with THERMOSCAN capturing the full temperature profile of the preform, while pressure data and material distribution are tracked in real time.
By combining 3D printed tooling with BLOWSCAN, BMT cuts the time from concept to prototype from weeks to just days, without sacrificing the engineering rigour needed to trust the results.
What leading packaging teams are achieving
By testing and refining bottle designs before committing to full-scale production tooling, packaging teams using this approach are:
Streamlining product development timelines
Reducing material waste through fewer failed production trials
Lowering production costs by avoiding expensive tooling rework
Accelerating packaging innovation from concept to shelf
The bigger picture
As James Nixon, BMT's Head of Hardware Innovation, notes, the shift from traditional prototyping toward simulation-backed, data-validated 3D printed tooling represents more than a speed improvement, it's a fundamental change in how confidently teams can commit to production. When virtual validation, 3D printed moulds and lab-scale testing work together, FMCG manufacturers gain a genuinely decisive competitive edge.
Don't guess. Validate smarter with BLOWSCAN. Find out more about our SMART Prototyping process, or get in touch with our team to discuss your next bottle development project.