You don't need a manufacturing background to get a custom part made, just the right process, a complete RFQ, and a way to compare verified quotes. Here's the 5-step walkthrough, including how Haizol matches and verifies factories.
Do you need to find a place to get custom parts made? Getting a custom part made looks like a search problem: find a factory, get a quote, done. It’s actually a specifications problem, and that’s where most people get stuck.
A vague drawing gets you quotes that can’t be compared, from suppliers you can’t verify, on a timeline that’s really just a guess. Single CNC prototype (RFQs) submitted through Haizol receive quotes from 18 or more verified factories within about 24 hours, but only once the request itself is built right.
This article covers how to choose the right manufacturing process, build an RFQ factories can actually quote against, verify who you’re dealing with, protect your design, and track the job once it’s out for quotes.
Getting a custom part made is a 5-part process: choose the right custom manufacturing method, prepare a complete RFQ, submit it to verified suppliers, evaluate what comes back, and protect your design throughout.
Skip any one of these and the rest breaks down. Pick a process before checking your volume and you’re re-quoting from scratch later. Submit a vague RFQ and you’re comparing quotes that were never pricing the same thing. Work with an unverified “factory” and you find out later it doesn’t own a single machine.
That’s the RFQ workflow: one structured request, evaluated across multiple verified suppliers, instead of chasing individual factories one at a time.
A quote, a comparable quote, and a verified quote sound similar, but each tells you something different about the price sitting in front of you.
|
Term |
What it tells you |
How you get it |
|
A quote |
A single price from a single source |
Emailing one factory or supplier directly |
|
A comparable quote |
Multiple prices against the exact same specifications |
Submitting one RFQ with complete specifications to several suppliers at once |
|
A verified quote |
A comparable quote from a supplier whose equipment, certifications, and capability have already been checked |
Submitting an RFQ through a platform that pre-screens suppliers before they’re allowed to respond |
A single quote tells you almost nothing on its own. Comparable quotes tell you where the market actually is. Verified quotes tell you whether the number in front of you is real. Most people who get burned skip straight from “a quote” to “an order” without ever passing through the other two.
Getting a custom part made comes down to 5 steps, done in order. Skipping ahead costs you time later; doing them in sequence is what makes a fast quote turnaround actually useful.
Choose the right manufacturing process by matching your part’s material, geometry, and order volume to a method, before you request a single quote.
|
Your situation |
Best process |
Typical lead time |
Typical volume |
|
Complex geometry, tight tolerances, prototypes to mid-volume |
CNC machining |
3–10 business days |
1–500 units |
|
Repeatable plastic parts at volume |
Injection molding |
3–4 weeks (prototype tooling) or 6–10 weeks (production tooling), then 1–3 weeks per run |
500–100,000+ units |
|
Enclosures, brackets, panels from flat stock |
Sheet metal fabrication |
3–10 business days |
1–10,000 units |
|
Complex cast geometry, thin walls |
Metal casting (die or investment) |
10–25 business days tooling, 3–8 weeks production |
500–50,000 units |
|
One-off parts, rapid iteration, internal geometry |
3D printing |
1–7 days |
1–50 units |
Say you need 2,000 plastic brackets with a snap-fit feature. Custom injection molding costs more upfront because you’re paying for a mold, but at that volume it beats CNC machining or 3D printing on a per-part basis by the time the first production run ships. Drop the same part down to 50 units and the math flips: the mold never pays for itself, so low-volume injection molding or CNC machining wins instead, even in the same material.
CNC machining and 3D printing get compared constantly because they overlap at low volumes, but they’re not interchangeable. CNC holds tighter tolerances and works in production-grade metals and plastics; 3D printing wins on internal geometry a cutting tool can’t physically reach. CNC machining vs 3D printing walks through where each one actually wins, with real cost data.
Custom plastic fabrication, machining plastic stock rather than molding it, is worth considering for small runs of engineering plastics like PEEK or Ultem/PEI, where cutting a mold would never pay back regardless of volume.
Sheet metal fabrication runs on a different logic entirely. Laser cutting and bending scale down to a single unit with no tooling cost, which is why it’s the default for enclosures and brackets rather than complex 3D geometry. The full process, cutting through finishing, is in sheet metal fabrication techniques.
Metal casting sits at the other end from sheet metal: tooling-heavy like injection molding, but suited to complex cast geometry and thin walls that CNC and sheet metal can’t produce affordably. What is casting parts? breaks down the 4 main casting methods and when each one applies.
Prepare a complete RFQ by including CAD files, material specification, tolerances, quantities, and certification requirements before you submit anything.
Essential information:
Sidenote. A drawing with a tolerance callout of “±0.1 mm on critical features” gets quoted faster and more accurately than one that says “tight tolerances please.” If you’re not sure what to specify, ISO 2768 tolerance classes is the standard reference most factories quote against. Vague specifications force factories to guess, and guesses produce wide, incomparable quotes.
Submit your RFQ to verified suppliers by uploading it through a platform that pre-screens factories, instead of emailing individual suppliers one at a time and waiting on each reply separately.
Use Haizol’s Mini RFQ form to do this in one pass.
That last step is what catches incomplete or ambiguous drawings before they ever reach a factory, not after a supplier has already wasted a day trying to quote against them.
Image: Haizol Quick RFQ form
Haizol matches your RFQ to factories in 3 steps: manufacturability review, capability matching, and verified release.
Verify who's actually quoting you by checking business registration, equipment, and certifications yourself, not just trusting what's on the quote.
On Haizol, all 4 of these are checked before a factory is even allowed to list as verified and quote on RFQs, a process broken down in full in how to verify Chinese CNC factories.
You can still double-check yourself: create a free account, open the factory directory, and filter by process type, certifications, remaining capacity, or material experience. Verified factories carry a green checkmark badge, and clicking into any profile shows you the equipment list, certifications, and product photos behind that badge before you ever award a job.
Go to RFQ dashboard and open your sourcing inquiry. Click on the factory that you want to view in greater detail.
Protect your design before anyone downloads it by setting your NDA level at submission, not after a factory has already seen your files. The full mechanics, including what makes an NDA actually enforceable against a manufacturer, are covered in NDA for CNC parts.
For example, Haizol offers 3 configurable levels. No NDA required lets suppliers download files without signing anything, which works fine for non-sensitive or already-public designs. Level-1 NDA requires every quoting supplier to digitally sign Haizol’s standard, legally binding NDA before they can access your drawings. Level-2 NDA lets you upload your own agreement instead. Each factory has to manually review it, sign it, and upload the signed copy back, and file access only opens once you’ve confirmed approval.
How fast depends on which clock you’re asking about: getting quotes takes about 24 hours regardless of process, but production lead time ranges from 3 days to 10 weeks depending on the method and whether new tooling is involved.
|
Process |
Quote turnaround |
Production lead time |
|
CNC machining |
~24 hours (8+ quotes on 90% of RFQs) |
3–10 business days |
|
Sheet metal fabrication |
~24 hours |
3–10 business days |
|
3D printing |
~24 hours |
1–7 days |
|
Injection molding (with new tooling) |
~24 hours for the quote |
3–4 weeks prototype tooling or 6–10 weeks production tooling, then 1–3 weeks per production run |
|
Metal casting |
~24 hours |
10–25 business days tooling, then 3–8 weeks production |
If you’re asking specifically how fast you can get custom injection molded parts: your first quotes land within a day, but budget 3–10 weeks for tooling before the first production parts ship, depending on whether you need prototype-grade aluminum tooling or full production steel tooling. Reordering from an existing mold skips all of that, typically 1–3 weeks.
Custom part cost is driven mainly by material grade, geometry complexity, tolerance tightness, surface finish, order volume, and any certification requirements, roughly in that order of impact.
Tooling-based processes like injection molding and die casting add a separate, one-time tooling cost on top of per-part price, which is why volume matters so much for those processes specifically. Molds cost more than most other tooling because cutting hardened steel to your exact part geometry takes weeks of machining before a single plastic part exists, and that cost is locked in whether you order 500 units or 50,000. The full cost breakdown, factor by factor, is in injection molding tooling costs from China.
CNC machining, sheet metal, and 3D printing carry no tooling cost at all, so their per-part price stays more stable across smaller volumes. For CNC specifically, CNC machining cost in China breaks the number down by hourly rate and material.
The fastest way to get an accurate number isn’t a pricing calculator. It’s a complete RFQ: quotes based on your actual drawing, material, and tolerances will always beat a generic estimate.
Decide between injection molding (for volume, once tooling cost pencils out), CNC machining plastic stock, or 3D printing (for prototypes and low volumes), then submit an RFQ with your CAD files, material, and tolerance specifications to receive comparable quotes from verified factories.
Submit your flat pattern or 3D CAD file along with material, thickness, and finish requirements. Sheet metal fabrication (laser cutting, punching, bending) typically quotes and produces in 3–10 business days for standard parts.
Your first quotes land within about 24 hours. Production takes longer: 3–4 weeks for prototype tooling, 6–10 weeks for production-grade tooling, then 1–3 weeks per production run once the mold exists.
No. There’s no platform-side minimum order quantity on Haizol. Individual factories decide whether to quote based on part complexity and volume, and higher quantities typically draw more competitive quotes.
Quote turnaround is how long it takes to receive pricing, about 24 hours on Haizol. Production lead time is how long it takes to actually manufacture and ship the part, anywhere from a few days for CNC, sheet metal, and 3D printing to several weeks for tooling-based processes.
More people sourcing custom parts are moving away from single-supplier sourcing every year, not because it’s trendy, but because comparing verified quotes catches pricing and capability problems a single quote never surfaces.
The advantage compounds the more you do it. Every RFQ submitted through a verified process gives you a clearer picture of what your parts should actually cost and who can actually make them, so the next one gets faster and safer.
Ready to get your part made online? Submit an RFQ on Haizol and see what verified factories quote you within 24 hours.