What Does Light-Curing 3D Printing Really Cost Per Gram?

What Are the Five Core Components of Cost Per Gram?

The total cost per gram is not a single number but the sum of several distinct cost centers. Understanding each is key to accurate budgeting and identifying savings opportunities.

1. Material Cost: The Variable Foundation

Resin is the primary consumable, and its price varies dramatically by formulation. It’s typically sold by volume (liters), but cost per gram is more useful for comparison.

• Standard/General Purpose Resins: $0.03 – $0.08 per gram. The entry point, suitable for visual prototypes and models.
• Engineering/Tough Resins: $0.08 – $0.15 per gram. Formulated for higher impact resistance, flexibility, or thermal stability (HDT up to 120°C). Used for functional prototypes and snap-fits.
• Specialty Resins: $0.15 – $0.50+ per gram. This category includes dental biocompatible resins, castable (burn-out) resins for jewelry, and ceramic- or glass-filled resins. Their specialized chemistry and certifications command a premium.

Pro Tip: Material cost isn’t just the resin in the part. A significant portion—often 20-40%—goes into support structures that are printed and then discarded. This “waste factor” must be included in your material budget.

2. Equipment Depreciation & Operational Cost

The printer itself represents a capital cost amortized over its lifespan and usage.

• Desktop/Prosumer Printers ($2,000 – $10,000): With an assumed lifespan of 10,000 print hours and moderate use, depreciation can add $0.02 – $0.05 per gram to the cost.
• Industrial/Professional Printers ($20,000 – $100,000+): Higher throughput and reliability come at a cost. Depreciation for these systems can range from $0.05 – $0.15 per gram, depending on utilization.
• Consumables & Maintenance: This includes replacement FEP/LCD films, VATs, and UV light sources. For a busy printer, this can add $0.01 – $0.03 per gram.

3. Post-Processing: The Non-Negotiable Labor & Material Sink

A resin part is not complete when the print finishes. Post-processing is mandatory and labor-intensive.

• Washing: Requires isopropyl alcohol (IPA) or proprietary solvents. Solvent cost and replacement add ~$0.01 per gram. Ultrasonic wash stations improve consistency but add to equipment cost.
• Curing: A UV curing station is required to fully polymerize the part. Chamber cost and electricity add a minor per-gram cost, but the labor to manage the process is significant.
• Support Removal & Finishing: This is the most variable cost. Removing supports and light sanding might add $0.05 – $0.10 per gram in labor. For a show-ready finish requiring extensive sanding, priming, and painting, labor can exceed $0.25 – $0.50 per gram.

4. Labor & Overhead: The Hidden Multiplier

This covers the human time required for file preparation, machine setup, monitoring, and post-processing.

• In-House Printing: Your employee’s hourly rate, prorated for the time spent per job.
• Service Bureau Pricing: This is where labor is bundled. A service bureau’s markup to cover technicians, rent, software, and profit often doubles or triples the raw material and machine cost. For simple parts, labor might add $0.10 – $0.30 per gram. For complex, high-touch jobs requiring expert orientation and support generation, it can be much higher.

5. Software & Preparation

While often a fixed cost, specialized slicing software (like Lychee Slicer or PreForm) and the time to expertly prepare files—orienting for minimum supports and optimal quality—contribute to the overall cost structure, especially for service providers.

What Does the Total Cost Look Like in Real Scenarios?

To make this tangible, here is a comparative breakdown for three common use cases, assuming a 100-gram final part (net weight, excluding supports).

Note: These are illustrative estimates. Service bureau quotes will bundle these costs differently, often providing a total price per part or per build volume.

How Can You Effectively Reduce Your Per-Gram Cost?

Strategic decisions at each stage can lead to significant savings.

1. Design and File Preparation Optimization

• Minimize Supports: Orient your model to reduce overhangs. Use advanced slicing software to place light-touch supports only where absolutely necessary. This reduces resin waste and post-processing labor.
• Hollow Your Models: For large, solid pieces, hollowing out the interior (with defined drain holes) can reduce resin usage by 60-80%, drastically cutting material cost. This is a core advantage of light-curing for large-volume parts.

2. Strategic Material and Service Selection

• Match Resin to Requirement: Never use a $0.40/gram dental resin for a concept model a $0.05/gram standard resin can handle.
• Batch Printing: Maximize the build plate. Printing multiple parts in a single job spreads the fixed costs of machine time and labor across more units, lowering the per-part cost significantly.
• Evaluate In-Housing vs. Outsourcing: For ongoing, predictable volume, bringing printing in-house eliminates the service bureau profit margin and can offer long-term savings, despite the upfront capital investment. Use a Total Cost of Ownership (TCO) calculator to compare.

3. Efficient Post-Processing Workflow

• Invest in Automation: For volume production, a washing and curing station reduces manual labor time and improves consistency.
• Standardize Finishing Levels: Define clear finish levels (e.g., “as-printed with supports removed,” “sanded,” “painted”) and avoid over-finishing parts that don’t require it.

How to write a spec that gets priced correctly

A drawing is a contract. If it leaves a number open, the shop fills that number in with its own default. The default is rarely the one you had in mind. Put these five lines on every RFQ and most of the back-and-forth disappears before it starts.

• File format and units, with the model exported in millimetres
• Process and material grade, not a trade name
• Critical features and the tolerance each one needs
• Surface finish and the faces it applies to
• Quantity for the pilot build and for the year

The point is not paperwork. Each line removes a decision the shop would otherwise make for you. A complete RFQ comes back priced. An incomplete one comes back guessed.

What actually drives the price

Buyers usually push on material because it is the line they can see. In practice the material is rarely the biggest number on a quote. These five lines decide most of it:

• build volume and orientation
• layer height and support structure
• material grade and colour
• post-processing and hand finishing
• quantity per build plate

Ask for the quote split by line. A supplier who cannot break it down is guessing, and you will pay for the guess. The line you can usually renegotiate is the tolerance band, not the raw material.

Problems you will meet, and the fix

Every process has a failure mode it prefers. The same four show up again and again on this kind of work, and none of them are mysteries once you know what to look for.

• Warping on long flat faces where the part lifts off the plate
• Layer lines showing through a cosmetic surface
• Support scars on a mating face nobody flagged
• Dimensional drift on thin walls after cooling

Catch the fault on the first part, not the hundredth. A first-article check costs an hour. A bad batch costs the whole order. Write the check into the purchase order so nobody has to remember it.

What to check on the first article

The first article is the cheapest inspection you will ever buy. Use it properly and the rest of the run becomes boring, which is exactly what you want.

• Every dimension on the drawing, with the measured value written beside it.
• The material certificate, matched to the heat or lot number on the parts.
• The finish against the sample you approved, under the same light.
• Fit against the mating part, assembled rather than measured.
• Packaging, because parts that arrive damaged were never in tolerance.

Check in this order: datums, then mating features, then cosmetic faces. If the datums are wrong, every number after them is noise. Keep the report on file. When a problem shows up in month six, that document is the only thing that tells you what changed.

How to compare two quotes fairly

Two numbers are not comparable unless the scope matches. Line them up before you decide, because a low number with three gaps is not a low number.

Same drawing, same material, same finish, same inspection. Anything else is a different job wearing the same part number. Then look at what each quote leaves out. Freight, packaging, certificates and tooling are the usual gaps.

Ask each supplier to state their assumptions in writing. The one who does is usually the one who has run the process before.

Scaling from one part to a batch

The first part teaches you the process. The hundredth teaches you the process cost.

Watch three things as volume grows: setup amortisation, tool wear, and how much hand work the finish still needs. If the unit price barely moves between ten and a hundred, the cost sits in material or in hand work, not in setup. Ask which, because only one of them is negotiable.

Lead time behaves the same way. A one-off is scheduled around other jobs. A repeat order is scheduled around your forecast. Give the shop a forecast and the lead time gets shorter, not longer.

How to read a supplier's quote

A quote is a short document with a long shadow. Four things in it decide whether the job runs smoothly, and only one of them is the price.

• The scope line. It should name the process, the material and the finish, not just the part.
• The tolerance basis. General tolerance or the drawing, and which standard it follows.
• The exclusions. Tooling, freight, certificates and inspection are the usual omissions.
• The validity date. Material prices move, and an open-ended quote is a promise nobody can keep.

Read the exclusions before you read the total. A quote that leaves out tooling is not cheaper. It is a quote for a different job.

What to send with the first order

The first order sets the pattern for every order after it. Send a complete package once and the shop files it, and the second order takes a fraction of the time.

• A STEP or native model plus a PDF drawing carrying the same revision letter.
• The material callout by standard number, not by trade name.
• The finish and the exact faces it applies to.
• Any test the part must pass: fit, seal, drop, salt spray, dielectric.
• A contact who can answer a question inside one working day.

Then write down what was agreed. An email that confirms the material, the finish and the date is worth more than a longer purchase order that leaves them open.

What Are Common Pitfalls That Inflate Costs?

• Ignoring the Support Waste Factor: Budgeting only for the net part weight is a classic error. Always assume an additional 20-40% resin for supports.
• Underestimating Post-Processing Time: The printer’s time is only part of the cycle. A 4-hour print might require 30 minutes of skilled labor for washing, curing, and support removal.
• Choosing the Wrong Partner/Model: Using a high-margin, on-demand service for large production runs, or buying an industrial printer for occasional prototyping.

The cost per gram for light-curing 3D printing is a multifaceted metric, heavily influenced by your choice of material, finishing requirements, and production model (in-house vs. service bureau). While raw resin costs start around $0.03/gram, the fully burdened cost for a finished, functional part typically ranges from $0.20 to over $1.00 per gram. The key to cost control is strategic optimization: intelligently hollowing designs, minimizing supports, batching jobs, and meticulously matching material capabilities to application needs. By understanding and managing the five core cost drivers—material, equipment, post-processing, labor, and overhead—you can leverage the unparalleled detail of light-curing 3D printing in a financially sustainable way, ensuring it remains a precise tool for innovation rather than a source of budgetary surprise.

FAQ: Light-Curing 3D Printing Cost

Q: Is light-curing (SLA/DLP) always more expensive per gram than FDM printing?
A: For the raw material alone, yes, resin is more expensive than filament. However, a direct per-gram comparison is misleading. Light-curing often provides higher value per gram where it matters: surface finish, dimensional accuracy, and isotropic strength. For a part requiring extensive sanding and finishing in FDM to achieve a similar smoothness, the total finished part cost may be closer than the raw material disparity suggests. FDM wins on pure material cost for rough prototypes; light-curing wins on “ready-to-use” quality for detailed parts.

Q: How does part size and build volume utilization affect the per-gram cost?
A: It significantly affects the efficiency metric. Filling the build plate with multiple parts dramatically reduces the per-part allocation of fixed costs like machine time, labor for setup, and VAT preparation. Printing a single, small part in the center of a large build plate is the most expensive way to use the technology on a per-gram basis. Always aim to maximize batch density.

Q: Can I recycle or reuse uncured resin and alcohol from washing?
A: Uncured resin in the VAT can generally be reused. It should be filtered if any cured bits are present. Used wash alcohol can be recycled by letting the dissolved resin settle out, then decanting the clearer alcohol. However, over time, the alcohol becomes saturated and less effective, eventually requiring proper disposal and replacement. Recycling extends consumable life but adds a labor step.

Q: Why do service bureau quotes sometimes seem disconnected from a simple per-gram calculation?
A: Service bureaus price based on value, expertise, and risk management, not just commodity consumption. Their price includes file validation and repair, expert support generation to ensure your print succeeds, guaranteed quality, and liability. They also have minimum order fees to make small jobs economical. For a simple cube, you’re paying for their insurance that your complex, $5000 prototype won’t fail.

Our solution for Light-Curing 3D Printing

YiguProto runs 3D printing in house, from a single prototype to a production batch. We quote the process, the material and the finish as separate lines, so you can see where the money goes instead of arguing with one number.

Send a STEP file or a drawing and you get a DFM report in one to two business days. It flags the features that add cost and the features that will not hold tolerance on the process you picked.

Every order ships with an inspection report on the features you call out. If a part misses, we make it again. Ready to price a part? Start with a free quote and DFM review, or read more about our 3D printing. You can also talk to an engineer before you commit to a drawing.

FAQ about Light-Curing 3D Printing

The short version

Light-Curing 3D Printing rewards the buyer who reads the data sheet and the drawing together. Pick the option for the property that matters, not for the price per kilo.

Tighten only what mates. Test a sample before the run. Then let the process do the rest.