Dental model 3D printing has become the backbone of the digital dental workflow - but the difference between a model that seats a crown on the first try and one that goes back to the reprint pile comes down to process, not luck.
Here is the complete workflow at a glance:
Scan the patient or impression (intraoral or lab scanner)
Export and design the model in CAD (exocad, 3Shape, exocad-compatible workflows)
Orient and support the model in slicer software
Print with a dental model resin on an LCD/DLP printer
Wash the print
Cure the print (time-controlled UV)
Verify accuracy and deliver
Below, we break down every step with the settings and checkpoints that dental labs and clinics actually use - including the tolerances that matter for clinical fit.
Step 1: Scan - Start with Data You Can Trust
Everything downstream depends on scan quality. You have two paths:
Intraoral scanning (chairside). A modern intraoral scanner like the Aident AI-30 captures a full arch in about 20–25 seconds with roughly 10 µm accuracy - no powder, no impressions, no gag reflex. For chairside model printing, scan-to-print in a single visit is now realistic.
Lab scanning (impression or model digitization). If you receive physical impressions or plaster models from clinics, a desktop dental lab scanner digitizes each arch in seconds. When scanning batches, per-arch scan speed becomes your productivity ceiling - this is where automated multi-position lab scanners pay for themselves.
Checkpoint before moving on: verify full arch coverage including the distal of the last molar, minimal stitching artifacts, and clean margins. Re-scanning takes 30 seconds; reprinting takes an hour.
Step 2: Design - Prepare the Model in CAD
Export your scan as an STL, PLY, or OBJ file and open it in your dental CAD software (exocad, 3Shape Dental System, or similar - Aident printers export and accept all three formats cleanly).
Key design decisions for print-ready models:
Die spacing: 20–40 µm cement gap for crown and bridge models; skip this and your crowns will seat tight.
Hollowing (optional): hollowing large models saves 30–50% resin, but keep walls at least 2 mm thick to prevent warp-through during curing.
Base design: add a flat, stable base at least 3–5 mm thick. A wobbly model is an articulator problem waiting to happen.
Removable dies: design pin holes with 0.1–0.15 mm clearance to account for resin shrinkage.
Step 3: Slice - Orientation and Supports Are 50% of Print Quality
Import the STL into your printer's slicer. This is where most failed prints are born, so slow down here.
Orientation rules for dental models:
Print occlusal surfaces facing up at a 0–15° tilt, or dies at 90–135° - never flat, or you'll get heavy layer-stepping on occlusal anatomy.
Angle the model 5–10° off the build plate to reduce peel forces and cross-section area on early layers.
Keep at least 5 mm between models on the plate when batching.
Support strategy:
Use fine supports (0.3–0.4 mm contact tips) on non-functional surfaces.
Never place support tips on margins, occlusal contacts, or intaglio surfaces.
Add raft/base supports generously - dental models are dense and heavy; undersized rafts cause mid-print failures.
Layer height: 50 µm is the lab standard for models; drop to 25–35 µm for dies and implant work where marginal fit is critical.
Step 4: Print - Choose the Right Machine for Your Volume
Two machine classes dominate dental model printing:
Chairside printers (compact, ~12 kg class, e.g. Aident Ai-C60): built-in curing, auto-leveling, constant-temperature resin control, and ±0.03 mm accuracy. A full-arch model prints in about 25 minutes - realistic for same-day crown and bridge workflows where the model is printed, cured, and used between patient appointments.
Lab batch printers (large build volume, e.g. Aident Ai220 with a 220 × 125 × 150 mm chamber): print 8–12+ full-arch models per run. When your lab handles 30+ cases a day, batch throughput - not single-print speed - determines delivery schedules.
What actually matters in the spec sheet:
|
Spec |
Why it matters |
Look for |
|
XY resolution |
Margin detail, surface finish |
≤ 35 µm |
|
Accuracy tolerance |
Clinical fit |
±0.03–0.05 mm |
|
Build volume |
Models per batch |
Match to daily case count |
|
Open vs closed system |
Resin cost freedom |
Open systems cut long-term cost |
|
Temperature control |
Dimensional stability |
Active heating, not ambient |
Step 5: Wash - The Step Everyone Ruins
Fresh prints carry uncured resin that must be removed before curing.
IPA (≥95%): 3–5 minutes agitated wash for standard resins; two-bath method (dirty bath → clean bath) extends solvent life dramatically.
Compatible wash solutions: follow your resin manufacturer's guidance - some dental resins degrade in IPA.
Never leave models soaking - over-washing swells surfaces and softens fine margins.
Dry fully (compressed air + 10 minutes air dry) before curing. Curing wet prints causes hazing and tacky surfaces.
Step 6: Cure - Time, Temperature, and Wavelength
Under-cured models are flexible and dimensionally unstable; over-cured models turn brittle and yellow.
Typical dental model resin: 5–15 minutes in a 405 nm UV curing unit, per manufacturer spec.
Post-cure at room temperature; avoid curing immediately after a hot wash cycle.
Rotate large models halfway through cure cycles for even exposure.
Store cured models away from sunlight - UV continues degrading resin on the shelf.
Step 7: Verify Accuracy - Fit-Check Before Delivery
Build a simple QC habit:
Marginal fit: seat the die or crown; check for visible gaps under magnification.
Occlusal contact: articulate against the opposing model.
Dimensional spot-check: measure intermolar width on calipers against the digital file (should agree within ±0.05 mm).
Log failures by cause (orientation? supports? resin age? wash time?) - your failure pattern will tell you which step to fix.
Common Problems and Fixes
|
Problem |
Likely cause |
Fix |
|
Model fails mid-print |
Insufficient supports / heavy raft |
Increase raft size, thicker base supports |
|
Margins rounded or soft |
Over-washing or wrong orientation |
Shorten wash, orient margins up |
|
Model doesn't seat on articulator |
Warp from under-curing or thin base |
Full cure cycle, ≥3 mm base |
|
Sticky surface after cure |
Wet print cured / expired resin |
Dry completely; check resin shelf life |
|
Crowns seat too tight |
Missing or insufficient die spacer |
20–40 µm spacer in CAD |
|
Layer lines on occlusal anatomy |
Flat orientation |
Re-orient 90–135° |
FAQ: Dental Model 3D Printing
How long does it take to 3D print a dental model? A full-arch model prints in about 25 minutes on a modern chairside printer like the Aident Ai-C60, plus 5–10 minutes washing and curing. Scan to finished model is achievable in under an hour.
What accuracy do dental 3D printers need? ±0.03–0.05 mm is the accepted range for clinical model work. Below ±0.03 mm (like the Ai-C60's spec) leaves headroom for the combined tolerance of scan, design, and print.
Can I print dental models from any intraoral scanner? Yes - models are designed from standard STL/PLY/OBJ exports, which every major scanner produces. What matters is that your printer accepts open files. Aident printers run open systems compatible with exocad, 3Shape, and CEREC workflows.
What resin should I use for dental models? Use a dedicated dental model resin - not general-purpose resin. Model resins are formulated for low shrinkage, dimensional stability, and fast curing. See our guide to dental model resins below.
How much does dental model 3D printing cost per model? Material cost per full-arch model typically runs $1–3 on an open-system printer - a fraction of outsourced stone model costs, before counting shipping and turnaround savings.
From Reading to Printing
If you're setting up your first in-house workflow, the fastest path is a matched scanner-printer-resin system with training included. Aident bundles the AI-30 intraoral scanner with the Ai-C60 chairside printer for clinics, and the Ai220 batch printer for labs - all CE-certified with open resin compatibility.
Explore the machines:
Chairside 3D printing for dental offices
Or request a quote and workflow consultation - tell us which applications you print (models, guides, temps, dentures) and we'll match the system to your case mix.
