Start Roto #10 | First part in hand — what to test before moving forward — LIVE

What you gain by watching

• Learn how to validate your first rotomolded part with a practical roadmap that avoids classic finishing, thickness, and fit errors, saving you rework and losses.
• Discover how to turn the testing and documentation process into a technical defense against suppliers and a tool to optimize costs and increase your profit margin.
• Understand why the problem is rarely the machine or the design, but the process and real-world use — and how simulating the part's complete journey prevents failures that not even the best simulation predicts.

Episode chapters

1. 1

   SEBRAE doesn't understand rotomolding: validation that only those who live on the factory floor can teach

   When someone decides to get into rotomolding, it's common to seek generic guidance — and hear things that discourage. In this episode of Start Roto, we talk about the validation stage and tell the story of a client who went to SEBRAE, where they received a 'cold shower' that almost made them give up; we, who built three roto companies and learned from mistakes on the factory floor, show that textbook theory needs to be adapted to the process's particularities. And we reinforce that, even without a generic framework, it's possible to guide those who want to start or change niches, because real experience is worth more than ready-made formulas.

   They threw cold water on me there, and I got discouraged.

   ▶ Watch at approximately 1:44
2. 2

   Planning in rotomolding: machine size defines the niche and limits the future

   On the factory floor, the nagging question is: how to validate an idea without getting stuck on a single product? In this episode, we tell the story of a service provider who wanted to migrate to in-house production and was guided by SEBRAE but found the adaptation of this methodology for the specific challenges of rotomolding at Portal. We show how choosing the machine size can constrain the business, revealing that correct planning starts before the purchase: understanding the product and its possible niches (like garbage bins or traffic delineators) is what guarantees market flexibility, not just initial capital.

   It's everything we're bringing here on Start Roto, the only difference is that we adapted all this knowledge, all the validation that's done today in Industry 4.0, we're bringing it adapted for rotomolding.

   ▶ Watch at approximately 7:01
3. 3

   First part came out beautiful? The flaw might be hidden in the finish

   When the first prototype part arrives from the outsourced partner's hands, excitement can lead to a classic mistake: approving the visual and wanting to move straight to market. In this episode, we show the safe path between that moment and final release, starting with an analysis of critical functions and going through a meticulous inspection of geometry, fits, and finish — always putting yourself in the end customer's shoes, not the supplier's. The conversation reveals that the apparent beauty of the part deceives and that you need to test in the field and document every piece of feedback before any decision, turning the first batch into structured learning that avoids the premature leap to the final mold.

   Sometimes it's details that, for those who are manufacturing, sometimes go unnoticed, right? But not for you, because for the guy outsourcing… his premise is this: the part is OK, it's functional, I've done my part as a service provider.

   ▶ Watch at approximately 12:04
4. 4

   The problem isn't the machine, it's the process: who evaluates your part, after all?

   In this section, we reflect on a common mistake: blindly trusting the partner as the only technical voice in validating your part. We show that before sending the product for function tests, you need to inspect the basics — cut the part, measure thicknesses, check if the layers formed well — and always seek a technical counterpoint, like a 'devil's advocate for your process.' The conversation culminates with the case of a client who blamed the machine for the failure, but we reminded her that the problem was with the person coordinating the parameters, even citing a wood-fired rotomolding operation that produced well when controlled.

   I told her: 'So the problem isn't the machine, the problem is the process. It's whoever is in front of the machine there, coordinating all the machine's parameters.

   ▶ Watch at approximately 17:07
5. 5

   Part beautiful on the outside and hollow inside: the test that reveals a true supplier

   In this chapter, we talk about how the appearance of a rotomolded part can deceive — a smooth, beautiful finish on the outside doesn't guarantee the material cooked properly inside. We tell the story of a supplier who, even with a simple oven and a digital thermometer, delivered perfect parts because they mastered the technical knowledge, and we show why cutting the part to inspect the wall and internal finish is a fundamental step in validation. We also brought the example of the fish box, which needs to seal before serving as a bench or decoration, to reinforce that the critical function — whether mechanical or thermal resistance — must be tested before any cosmetic detail.

   No matter how bad his machine was, his parts didn't fail. I didn't see any rejected parts there.

   ▶ Watch at approximately 22:09
6. 6

   When the lid's color doesn't fit: the invisible detail that fails a part

   On the factory floor, the first thing we look at in a part is the closure: whether the lid opens, closes, and aligns as it should — because that's where misaligned fits appear due to mold errors or, as we discovered in one case at home, simply due to a pigment change, since each color has its own expansion coefficient and makes the purple lid fail to close on the white pot of the same model. We also talked about holes, cuts, and finishes that need to be clean, and recalled how, for dog houses, the solution for the two-color part was to abandon the galvanized sheet that filled the part with bubbles and simply produce separately and then invert the parts. Finally, we told the story of a client whose boxes with hinged lids were stacked and sent to Bahia, and the story continues to show what happens when deformation during transport compromises use.

   The pigment has its function, there's the white, you added the white, now to get to that purple, how many pigments will they have to add to achieve that shade… so you have a different expansion coefficient, so the lid doesn't fit.

   ▶ Watch at approximately 27:11
7. 7

   How a rope and a three-thousand-kilometer trip can deform your part

   In this section, we talk about a problem that seems simple, but can be costly: transporting rotomolded parts. We told the real story of a truck driver who, while tying down a load of thousand-liter boxes, noticed a slight elastic deformation and, even thinking it wasn't serious, continued the journey for three thousand kilometers in the sun, tightening the rope at every stop. When he arrived at the destination, the boxes were completely deformed, beyond repair. That's when we hit the central point: it's not enough for the design to be perfect on the bench; you need to simulate real and extreme use, as the customer and transport will do, because freight and packaging impact cost and quality — and we showed how, in a project with Embrapa, a simple change in the box design reduced transport volume from three to one, or seven to one, proving that development must consider the complete journey of the part until final use.

   When he looked, the rope was already at floor level, you know? Just to give you an idea of how important it sometimes is; it's important even for you to analyze how you're going to transport it.

   ▶ Watch at approximately 32:13
8. 8

   What the design doesn't predict: when the customer uses the lid as a ladder

   We discovered in the field what no project can predict: the part broke because the truck driver climbed on it to tie down the cargo, a real-world use that required thickness reinforcement. This case led us to discuss how structured feedback and careful observation are essential, and we told the story of a factory where an improvement was redone in vain due to lack of documentation — something that only changed when they started recording every attempt and approval, avoiding repeating old mistakes.

   You have to document everything, even if it's a napkin, a piece of toilet paper.

   ▶ Watch at approximately 37:18
9. 9

   Why documenting every test with photos and videos can save your contract

   On the factory floor, anxiety and noise hinder the perception of details during a part test. Therefore, we reinforced the importance of separating tests by stage and recording everything with photos and videos, because watching calmly later reveals behaviors that go unnoticed at the time. This documentation becomes your best defense against suppliers who insist on saying the part is good, especially when you lack the technical knowledge to refute them; having the record allows you to seek a second opinion and even expose damages that a supervisor, often, hides behind blind acceptance.

   Record it, watch it later calmly. So always, every time you're going to watch this feedback, you'll be able to gather as much information as possible, even details about the part's behavior during the test.

   ▶ Watch at approximately 42:28
10. 10

    The invisible cost no factory owner sees — and the accounting that returns R$ 480 thousand to the cash register

    Anyone who lives on the factory floor has come across that half-baked technical guidance that makes the owner accept 50% loss as normal or doubt that recycled material can be used. We talked about the risk of trusting those who don't master the process and how this invisible cost erodes results — and we showed that the solution also involves tax planning: in the case we told, a transport company that billed R$ 2.5 million per quarter stopped paying R$ 480 thousand in taxes with the right adjustment. We also brought in partner Ivan Grisolia, from CX Contábil, to explain how a well-done tax classification is an investment, not a cost.

    He thinks 50% loss is normal. That's exactly it. Because he says it's impossible to achieve 100%.

    ▶ Watch at approximately 47:39
11. 11

    Before launching, practical testing is worth more than perfect simulation

    When the product leaves the design phase and goes to the factory floor, the part we imagined as perfect doesn't always behave as expected — that's why we advocated for setting clear acceptance criteria and differentiating cosmetic defects from structural usability problems. We told the real case of a non-standard pallet that needed to support specific loads at a company in Varginha: without a process engineer and fearing the risk of ruining an entire batch, we revealed how the solution was to create a test part and have the customer validate it in real-world use, proving that even the best simulation leaves variables out.

    Nothing beats practical testing to test your product.

    ▶ Watch at approximately 52:40
12. 12

    Testing on the client can be a mistake: when cost adjustment becomes catastrophic failure

    When we tell stories about products that work on the computer but break in practice, we remember that some things only testing for real guarantees — and the test shouldn't be on the client, unless they're a top partner, as in the case of the custom-developed pallet. We talked about the dangerous line between the ideal and catastrophic failure: reducing cost on a part might please the buyer, but if it removes the cushion that supported the function, the bill comes to the user. That's why we separated what is a cosmetic detail and can pass — like the orange peel effect on a fishing box — from what is functional and needs to go back for adjustment, and we closed with the advice to test in the field with those who will actually use the product, not just those who sign the order.

    And we also talked about how we still have a lot to learn — the ideal to throw away and the catastrophic to hurt someone, you know?

    ▶ Watch at approximately 57:43
13. 13

    The briefing was law: turning weight limits into approved boxes and more profit

    When the client imposed a maximum weight per box, we discovered that the real miracle wasn't just sizing the structure and reinforcement to the limit, but ensuring approval from those who used the part daily — the operator. We told how we documented each test, got the OK from everyone on the line, and, after approval, went further: we showed that costs can be reduced by changing components, like casters, without compromising safety, as long as the briefing becomes non-negotiable law and the profit margin gains a new ally.

    The operator was the one who started feeling sick. "Oh, it won't take the weight".

    ▶ Watch at approximately 1:02:47
14. 14

    When the first part comes out with 50% more material: the learning that became a method

    On the factory floor, the pressure to deliver the first part within the promised weight can lead to difficult decisions — and that's exactly what we experienced when, no matter how much we adjusted the mold, the part only formed with 50% more material, and the client, who had already closed the order, wouldn't accept changes. We shared how this experience became a lesson: we learned that, before optimizing weight or cost, you need to technically finalize the design and then, yes, seek material and process alternatives, always with documentation and testing. Today, our insight is clear: the big X of the issue isn't passing costs on to the client, but reducing your own cost to increase margin — and this applies even to established parts, where continuous improvement is what maintains competitiveness.

    The big X of the issue today isn't increasing your margin by passing the cost onto the client, because you end up losing competitiveness, but rather increasing your margin by reducing your cost.

    ▶ Watch at approximately 1:07:50
15. 15

    Switching virgin for recycled can cut 40% of cost? Color is the limit

    On the factory floor, the burning question is: why insist on virgin raw material if quality recycled material already meets the requirements — and with a cost reduction that can exceed 40%? We talked about a real case: a client who produced slide steps with virgin material only because of the color, not the resistance. We showed that the only real limitation is the shade, and that with the right partners, it's even possible to certify UV additives and traceability. The turnaround comes with guidance: test, evaluate with one of our visits, and see that the switch is viable — often without the end customer noticing a difference.

    The only limitation is this: the issue of color, of shade. But nothing stops you from making a change either, putting a product there that, when it's a new client, they won't see that difference.

    ▶ Watch at approximately 1:13:56
16. 16

    From midnight to dawn: rotomolding that opens doors and moves communities

    In this warm closing, we celebrate the power of rotomolding to connect people and reveal market potentials that go far beyond what one imagines — like the client who came across the eighth episode by chance and was impressed by the niches the technology reaches. We also talked about our community that spans time zones and late nights, with Flávio from Portugal always demanding the episode on time, and the emotional bonds that sustain this journey. We closed with an invitation to keep following us, now with an eye on the goal of 250 subscribers and exclusive behind-the-scenes content on Instagram, because it's this daily exchange that keeps Portal alive.

    That opened a range of opportunities for him there, he was impressed with how rotomolding can be placed in the market in different niches

    ▶ Watch at approximately 1:19:06