Our work / Droptine Scent Dispenser
DropTine Scent Dispenser: Design and Manufacturing
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Written by Ralph Hill, Mechanical & electrical systems, 3D manufacturing
Prototyping Engineer
Published August 10, 2026
Developing a hunting product from a rough sketch means designing for cold hands, wet conditions and a field carry — then picking a manufacturing route that lets you sell at low volume before committing to tooling.
Rack Addict Attractants brought us their deer scent dispenser idea. We designed a four-part watertight device with a twist-lock extension for scent dispersion, made it both 3D-printable and moldable, and had it on the market in four months.
Project at a glance
- Client
- Rack Addict Attractants (RAA), a hunting products company in Louisiana
- Product
- DropTine scent dispenser — a durable field device that holds and releases deer attractant scent at the hunting site.
- Scope
- A rough customer sketch taken through concept design, CAD, prototyping, design for manufacturing and short-run production.
- Process
- Designed for both 3D printing and injection molding: printing for low volumes and fast iteration, tooling once volumes justify it.
- Outcome
- A finished product now sold through the client's own online store.
- Where it was built
- In-house in Ruston, Louisiana
What the client said
★★★★★
“I can't say enough about LA New Product Development. From the first phone call Konstantin and his staff walked us through the whole process from concept to prototype to final product design and production. They are experts at what they do, it has been a seemless and trouble free project.
LA New Product Development delivered on time and under budget. I look forward to working together on future projects. If you have an idea in your head there is no doubt they can make it a reality!”
Shane ArmandRack Addict AttractantsGoogle reviewThe client
The challenge
Our solution
The result
Invention design services at a glance
| Scope | Concept, CAD, functional prototypes, DFM, tooling, packaging |
|---|---|
| Process | Injection molding with off-the-shelf hardware |
| Deliverables | Production CAD, tested prototypes, supplier package, retail packaging |
| Typical timeline | 6-12 months idea to first production run |
Turning a hunting idea into a product
Most inventors arrive with a working principle and a shoebox prototype. The gap to a sellable product is unglamorous: wall thickness, draft, how the scent wick is retained, whether a cold hand in gloves can open it, and what the part costs at 5,000 units. We work that list in order rather than jumping to a patent drawing and a factory quote.
How the Droptine dispenser reached production
We iterated printed prototypes in the field, fixed leakage and refill issues, then converted the design for injection molding with uniform walls and moldable snap features. Tooling was sourced and qualified, and retail packaging was designed to hang on a peg in a sporting goods store.
Frequently asked questions
I only have a sketch. Is that enough to start?
Yes. A sketch and a clear description of the problem are enough for a concept phase; we produce CAD and a prototype you can test before spending on tooling.
Do you handle patents?
We are not attorneys, but we produce the drawings and descriptions your patent attorney needs and work around prior art you identify.
What does it cost to develop an invention?
Design and prototyping for a simple molded consumer product typically runs $8,000 to $30,000; tooling is a separate cost, usually $5,000 to $40,000 per mold.
Capabilities used on this project
Rapid prototyping services
3D printing, CNC machining, urethane casting and functional prototype builds with published materials, tolerances and lead times.
Low-volume manufacturing
Bridge tooling, short-run production and supplier management for first commercial batches.
Concept design
Sketch exploration, form studies and CAD concepts that turn an idea into a buildable direction.
Design for manufacturing
Molding-ready geometry, tolerances, production drawings, assembly documentation and DFM review with the tooling vendor.
How a hunting invention reaches the field
1. Translate field requirements into parts
RAA needed a dispenser that was also its own carry container — affordable, durable and simple. That became four parts: outer container, inner container, cap and a dual-purpose seal.
2. Make one feature do two jobs
The seal locks the cap to the inner container and keeps the unit watertight. A groove-and-pin mechanism lets the inner container extend for better scent dispersion, then separate for cleaning.
3. Design for two manufacturing routes at once
The device was engineered to be 3D printable and injection moldable. Printing needs no tooling and suits low volumes; molding wins at quantity. Designing for both lets the market decide before the money does.
4. Use short-run production as the launch
In-house design, prototyping and short-run production meant RAA went from sketch to sellable product in four months — inventory in hand while tooling was still optional.
| 3D printing | Injection molding | |
|---|---|---|
| Upfront tooling | None | Mold build, thousands of dollars |
| Unit cost at volume | High | Low |
| Best for | Market test, low volume | Proven demand, large runs |
| Design requirement | Printable orientation and walls | Draft, uniform walls, parting line |
Questions about this project
Straight answers from the engineers who ran the build. Have a different question? Ask us directly.
Talk to an engineerWhat did LA NPDT actually do on the DropTine scent dispenser?
We started from the client's rough sketch and handled concept design, CAD modelling, engineering, in-house prototyping, design for manufacturing and short-run production of the finished dispenser. One team covered every step, so the client never had to hand files between vendors. Send us your sketch and we will map the same path for your product.
How does a rough sketch become a product people can buy?
The sketch becomes a real CAD part first — wall thickness, draft, snap features, how it mounts in the field. Printed prototypes then get handled and tested the way a hunter would use them, and each round tightens the design. Only after the shape works do we set up production. Ask us for a quote on the engineering step and you will see the cost before committing to tooling.
When is 3D printing better than injection molding for a hunting accessory?
Injection molding is more economical at large quantities but requires tooling investment up front. 3D printing wins for prototypes, first market batches and any part you may still revise. DropTine was designed so both routes work from the same model, letting the client launch on printed parts and move to tooling as demand grew. We will tell you which side of that line your volume falls on.
Can you develop another outdoor or hunting product for me?
Yes. Outdoor gear, hunting accessories and rugged field devices are a regular category for us, from concept through short-run production. Share your idea and we come back with a phased plan, cost range and timeline, usually within one business day.
Industries this project belongs to
See how we approach development in each of these categories, and the other products we have taken from sketch to production there.
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