What Is the One-Step 3D Printing Process?

Introduction
You need a part made. The old way takes weeks: make a mold, set up a machine, cut and trim. The new way takes hours: send a file, print the part. This is the one-step 3D printing process. It turns a digital design into a physical object in a single stage. No tooling, no fixtures. This guide shows you how it works, why it saves time and money, and how to use it best for your projects.

How Does One-Step 3D Printing Work?

Think of it as digital to physical, directly. You skip all the middle steps of traditional making.

What Are the Traditional Steps?

Making a part usually needs many stages. For injection molding:

1. Design the part.
2. Design and make the mold (tooling). This takes weeks and costs thousands.
3. Set up the molding machine.
4. Inject plastic, cool, eject.
5. Trim off extra material (post-processing).

For CNC machining:

1. Design the part.
2. Program tool paths for the machine.
3. Clamp a block of material.
4. Cut away most of it (creating waste).
5. Change tools, cut more.
6. Finish the surface.

What Are the One-Steps?

With 3D printing, the process is simple:

1. Design your 3D model (CAD file).
2. Prepare the file in slicing software (takes minutes).
3. Print the part layer by layer.
4. Finish with minimal clean-up (sometimes none).

The key difference: There is no tooling. The printer itself is the universal tool. Change the part? Just change the digital file.

Real Case: A bike shop needed a custom tool to install a rare bearing. The old method: order a metal tool, 3-week lead time, $250. The one-step method: design the tool in an hour, print it on their FDM printer in PETG overnight, $2 in material. They used it the next day.

What Are the Main Benefits?

Why choose this method? Three core advantages stand out.

Is It Really Faster?

Yes, drastically. The lead time collapse is the biggest win.

• From Weeks to Days (or Hours): A complex prototype can go from screen to hand in 24-48 hours. No waiting for quotes, POs, or tool fabrication.
• Iterate Fast: Find a flaw? Change the CAD file and reprint. You can test multiple versions in a single week.

Data Point: A study by SME found that 3D printing cut average prototype lead time by 70-90% versus traditional methods.

Does It Save Money?

For low to medium volumes, yes. You avoid high upfront capital.

• No Tooling Cost: A simple injection mold can cost $5,000 to $50,000. For 100 parts, that’s $50-$500 added to each part before you even start. 3D printing has $0 tooling cost.
• Low-Volume Economy: Making 1 part or 100 parts costs almost the same per part with 3D printing. With injection molding, 1 part is wildly expensive due to tooling.

Does It Allow Complex Designs?

Absolutely. This is design freedom. You can make shapes that are impossible to machine or mold.

• Internal Channels (for fluid or air).
• Lattice Structures (light but strong).
• Organic, Grippy Surfaces.
• Single-Piece Assemblies (like a chain or ball-in-cage).

The printer does not care about complexity. It adds material only where the digital model says to.

Which Technologies Are Truly One-Step?

Some 3D printing needs lots of post-work. True one-step tech needs minimal human touch after printing.

Is FDM a One-Step Process?

Fused Deposition Modeling (FDM) is very close. You print the part, remove it from the bed, break off supports, and it’s often ready. For many functional parts, that’s it. The key is smart design to minimize supports.

What About SLS?

Selective Laser Sintering (SLS) is a top one-step tech. It uses nylon powder. The unsintered powder acts as natural support. You print the part, let it cool, then pull it out of the powder bed. A quick blast with air removes loose powder. No support removal needed. The part is strong and ready.

Is MJF the Ultimate One-Step?

Multi Jet Fusion (MJF) by HP is similar to SLS but faster. It also uses powder and needs no supports. Post-processing is mainly bead blasting to clean parts. It’s excellent for final, end-use parts straight from the machine.

Resin Printing: One-Step or Not?

SLA/DLP/LCD resin printing is one-step in build, but needs significant post-processing: washing in solvent and UV curing. For a true “ready-out-of-machine” experience, it’s less ideal than SLS/MJF.

One-Step Tech Comparison

How to Design for One-Step Success?

To get the fastest, cheapest part, design with the process in mind.

How to Cut Print Time and Cost?

The cost driver is print time, which links to material volume.

1. Hollow It Out: For non-structural areas, use shells and infill. A 2mm shell with 20% infill uses 70% less material than a solid block. Most slicers do this auto.
2. Minimize Supports: Design with max overhang angle in mind. For FDM, keep overhangs under 45 degrees if you can. Use chamfers not sharp overhangs.
3. Optimize Orientation: Sometimes lying a part flat makes it print faster than tall. Use your slicer to test orientations.

How to Ensure Strength?

One-step parts can be very strong if printed right.

• For FDM: Align the part so layer lines run along the main stress path. This prevents delamination.
• For SLS/MJF: Strength is near equal in all directions. This is a huge benefit over FDM.

Case Study: A drone maker needed a camera mount. FDM print (upright) broke at the layers in a crash. They reprinted it lying flat on the bed. The layer lines then matched the bending force. The new mount survived multiple crashes.

Where Does It Beat Traditional Making?

Know when to use this one-step power.

Short-Run Production (1-500 parts)

This is the sweet spot. The per-part cost is stable and competitive. No tooling cost makes the total cost lower.

Custom & On-Demand Parts

Make one unique part as cheaply as 100 identical ones. Perfect for medical guides, custom fit tools, spare parts.

Functional Prototyping

Test form, fit, and function with a material close to the final one. Get real feedback fast.

When Is It Not the Best Choice?

• Very High Volumes (10,000+): Injection molding per-part cost will be lower.
• Specific Material Needs: If you need a plastic not available for 3D printing.
• Super-Fine Surface Finish: As-printed parts have a texture. For a perfect glossy finish, you need post-work.

How Do You Start Using It?

The barrier to entry is low.

What Do You Need?

1. A 3D Model: Use free software like Tinkercad or Fusion 360 (for personal use).
2. A Printer or a Service:
   • Buy a Printer: An FDM printer starts at $200. Good for in-house prototypes.
   • Use an Online Service: Upload your file to a platform like Yigu, Xometry, or Sculpteo. They have industrial SLS/MJF machines. You get a quote in minutes, parts in days.

What Are the Hidden Costs?

Be aware of these:

• Operator Time: Someone must prepare files and manage prints.
• Material Waste: Failed prints, support material, unused powder.
• Post-Processing Labor: Even “one-step” needs some clean-up.

What Is the Future of One-Step?

It’s moving towards true “click-and-print” for final parts. Newer printers have more automation for post-processing. Materials are getting stronger and more varied. The goal: a part comes out of the machine and goes straight into use with zero human touch. We are getting close.

Conclusion

The one-step 3D printing process is a game-changer. It collapses time from weeks to days and eliminates high tooling costs. Technologies like SLS and MJF deliver strong, final parts directly from the printer with almost no post-work. To use it well, design for the process—hollow out parts, minimize supports, and choose the right tech for your need. It is perfect for prototyping, short-run production, and custom parts. For very high volumes, traditional methods still win on per-part cost. But for agility, speed, and complexity, the one-step process is now the smart choice.

FAQ

Is one-step 3D printing strong enough for final products?
Yes, with the right technology and material. SLS Nylon 12 and MJF PA12 are engineering-grade plastics. They are used in car interiors, airline ducts, and consumer products. Their strength is suitable for many end-use applications.

What is the biggest limit of one-step 3D printing?
Production speed for large volumes. While fast for 1-100 parts, it cannot match the seconds-per-part speed of an injection molding press running 10,000 units. It’s a batch process, not continuous.

How accurate are one-step printed parts?
Accuracy is very good. Industrial SLS/MJF can hold tolerances of ±0.3% (with a lower limit of ~±0.2 mm). FDM is about ±0.5% (±0.5 mm typical). This is sufficient for most mechanical fits.

Can I get a smooth surface finish in one step?
Not mirror-smooth. SLS/MJF have a gritty, sand-like finish. FDM has layer lines. For a smooth finish, you need a post-process like vapor smoothing (for ABS) or tumbling (for SLS). This adds a step.

Is it truly “one-step” if I have to remove supports?
For pure definition, no. But in industry terms, “one-step” means no separate tooling or fixture fabrication. The minimal support removal is seen as part of the print cycle, like ejecting a part from a mold. Technologies like SLS/MJF that need no supports are the closest to the ideal.

Discuss Your Projects with Yigu Rapid Prototyping

At Yigu, we live by the efficiency of the one-step process. Our online platform lets you upload a CAD file and instantly access prices for SLS, MJF, and FDM with true one-step post-processing. We help clients transition from costly, slow tooling to agile digital production. Recently, a sporting goods company used our MJF service to produce 200 custom bike light mounts in 4 days, bypassing a 6-week mold lead time. If you have a project that needs speed, flexibility, and cost control, let’s discuss how a one-step 3D printing workflow can deliver your parts faster.