When you’re ready to move a medical or life sciences product from design into production, one of the most consequential decisions you’ll make is how, and with whom, you manufacture it. For many organizations, that means choosing a contract manufacturing partner.
But even once you’ve identified the right partner, a subtler question remains: what level of engagement do you actually need?
At Ascential, we offer two distinct contract manufacturing approaches for automation systems and complex medical equipment: Build to Print (BTP) and Build to Print Plus (BTP Plus). On the surface, they may sound similar. In practice, they serve meaningfully different needs, and choosing the wrong one can cost you time, money, and market position.
Here’s how to tell them apart and determine which is the right fit for your project.
What Is Build to Print?
BTP is exactly what it sounds like: you provide complete, finalized product specifications, and your manufacturing partner executes against them with precision. The design is yours. The job of the contract manufacturer is to replicate it faithfully, at scale, on time.
This approach works well when:
- Your engineering team has already done the heavy lifting
- Your design is locked, validated, and ready for production
- What you need is technical execution, not another design review
The critical consideration here is execution. At Ascential, BTP is a precision manufacturing engagement. It assumes your specifications are solid and your primary need is a reliable, high-quality build partner who can move fast without cutting corners and manage the entire manufacturing lifecycle, including:
- Detailed design execution and turnkey assembly
- Supply chain coordination and quality control
- Robotics and automation integration as needed
- Production support across a global network of FDA-registered/ISO-certified facilities
What Is Build to Print Plus?
BTP Plus is the right model when you need active engineering support alongside manufacturing execution. Most often, that’s because you’re releasing a product modification or update to an existing, already-in-market product, and need your existing mechanical or software design changed to accommodate it. It’s also the right fit when a design is complete but hasn’t been fully stress-tested against production realities, or needs improvement before it scales. Common triggers include:
- The design was developed in isolation from manufacturing realities
- The product modification affects mechanical components, embedded software, or both
- Components are difficult to source, or materials underperform under production conditions
- Assembly processes that work in a lab create bottlenecks at scale
- You’re integrating automation into an existing workflow and need expert input on how to do it without disrupting what’s already working
BTP Plus brings Ascential’s engineering team into an advisory role alongside the manufacturing one. Our experts:
- Review your existing specs and make targeted design and manufacturability recommendations, including material upgrades, component substitutions, and process modifications, aimed at reducing production costs, strengthening product performance, and reinforcing regulatory compliance
- Conduct rigorous validation, calibration, and performance testing to surface and resolve issues before they become expensive problems downstream
Critically, this isn’t a redesign engagement. It’s enhancement. We’re not asking you to start over; we’re helping you get more out of what you’ve already built. See it in action: Transferring a Legacy Urological Device Production Line to the EU With Zero Disruption.
How Do You Know Which One You Need?
The clearest signal is the state of your design and how confident you are in its manufacturability.
Choose Build to Print if: Your design has been validated end-to-end, has survived rigorous testing, and is truly production-ready. You need a capable, disciplined manufacturing partner, not another design review. Bringing in additional engineering input at this stage can slow things down rather than accelerate them.
Choose Build to Print Plus if: You’re modifying an existing product’s mechanical or software design for a new release, your design is complete but hasn’t been fully stress-tested against production realities, or you’re planning to integrate new automation into an existing assembly process.
Questions worth asking your team:
- Has this design been manufactured at scale before, or are we doing it for the first time?
- Are there components or materials we’re uncertain about under production conditions?
- Are we modifying an existing, already-released product, and does that change touch mechanical or software design?
- Are we integrating robotics or automation, and do we have a clear picture of how that changes the workflow?
- How much runway do we have if a significant design issue surfaces mid-production?
If the answers reveal uncertainty, BTP Plus is probably worth the investment.
Related Reading: Contract Manufacturing for Medical Devices: 5 Critical Questions to Ask Before You Scale
The Cost of Getting It Wrong
It’s worth being direct about the stakes here.
Choosing Build to Print when your design still has manufacturability gaps can mean discovering those problems on the production floor, after tooling is set, supply chain is committed, and timelines are locked. That’s an expensive place to find out your component tolerances don’t hold at volume, or your assembly process creates quality variance that fails inspection. For product modification programs specifically, this risk shows up when a design or software change is approved to be manufactured before the impact on tolerances, sourcing, or assembly has been fully vetted.
Choosing Build to Print Plus when your design is genuinely production-ready adds an engineering layer you don’t need and can introduce unnecessary review cycles that push your launch date.
A thoughtful upfront conversation with your manufacturing partner, ideally as early as possible in the process, is the most reliable way to land in the right model from the start.
When in Doubt, Start the Contract Manufacturing Conversation Early
One principle applies regardless of which path you take: engage your contract manufacturer early. Because Ascential offers both BTP and BTP Plus as core capabilities, our in-house teams (product development, manufacturing, automation, and engineering) evaluate each project on its own terms and collaborate on an integrated solution that actually fits your program goals and budget, rather than steering you toward a one-size-fits-all engagement.
The earlier Ascential is involved in your project, the more visibility we have into potential risks and the more flexibility we have to address them. Whether that’s a pure execution engagement or a hybrid engineering-plus-manufacturing relationship, early alignment between your team and ours consistently produces better outcomes.
If you’re not sure which model fits your project, that uncertainty is itself a useful starting point. Our team is well-practiced at helping medical and life sciences companies think through exactly this question.
Not Sure Which Approach Fits Your Project?
Whether your design is production-ready or could benefit from an engineering review, the Ascential team can help you find the right path forward.
Before December 31, 2026, qualifying new customers can also lock in a 5-business-day BTP quote turnaround and 10% off their first order (up to $25,000).