Short answer

When designing for 3D-printed porous structures, prioritize achieving high precision and reproducibility in pore characteristics over exact adherence to initial design dimensions, as the process inherently introduces predictable variations.

Field: Commercial Production
Source: Research Square (2022)
Method: Experimental analysis and measurement
Sample: Multiple specimens for each of the three design parameters (1.15mm, 1.5mm, 2.0mm), with 50 measurements taken for each specimen type.
Evidence: Strong effect

Metal 3D printing can reliably produce lattice structures with consistent pore sizes and high porosity for orthopedic implants, even when the actual printed dimensions deviate from the initial design. This commercial production research insight is drawn from a 2022 study published in Research Square. Using Experimental analysis and measurement with Multiple specimens for each of the three design parameters (1.15mm, 1.5mm, 2.0mm), with 50 measurements taken for each specimen type., researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing for 3D-printed porous structures, prioritize achieving high precision and reproducibility in pore characteristics over exact adherence to initial design dimensions, as the process inherently introduces predictable variations.

Study

Commercial ProductionHigh ImpactStrong effect

3D-Printed Lattice Structures Achieve High Precision for Bone Ingrowth Implants Despite Design Deviations

Research Square · 2022

Key Findings

01Actual average pore sizes achieved were 257.9 µm, 406.2 µm, and 633.6 µm for the intended 1.15, 1.5, and 2.0 mm designs, respectively.
02Volume porosity ranged from 62% to 80% for the tested designs.
03No strut breakage or gross deformation was observed in any of the printed specimens.
04Pore cells were uniformly fabricated with a standard deviation of less than 10%, indicating high precision and reproducibility.
05Significant differences were found between designed and actual printed structures at the micrometer scale, but these errors were consistent.

Application

Design takeaway

How to apply

When developing 3D-printed implants or porous components, conduct thorough material and process characterization to understand and quantify printing inaccuracies. Use this data to refine designs or implement post-processing adjustments to meet functional requirements.

Project actions

01When designing a 3D-printed part, consider how the printing process might affect the final dimensions and tolerances.
02Focus on achieving consistent results rather than perfect replication of the initial CAD model if precision is more critical than exact form.

Method & Evidence

AimTo investigate the stability and accuracy of pore sizes in 3D-printed lattice structures intended for bone ingrowth, and to determine if targeted pore dimensions can be achieved despite printing errors.

MethodExperimental analysis and measurement

ProcedureCubic lattice structures with varying intended pore sizes (1.15, 1.5, and 2.0 mm) were fabricated using selective laser melting. Beam compensation was applied during printing. The actual dimensions of the unit cells and strut thicknesses were measured, and pore sizes and volume porosity were calculated. Strut integrity and overall deformation were also assessed.

SampleMultiple specimens for each of the three design parameters (1.15mm, 1.5mm, 2.0mm), with 50 measurements taken for each specimen type.

ContextBiomedical device manufacturing, additive manufacturing, orthopedic implant design.

Variables

IVIntended pore size (1.15 mm, 1.5 mm, 2.0 mm)

DVActual pore size, volume porosity, strut thickness, strut integrity, deformation

CVMaterial (metal), 3D printing method (selective laser melting), specimen shape (cube), strut structure (dode-thin)

Strengths & Limitations

Strengths

+Direct measurement of actual printed dimensions.
+Assessment of both accuracy (deviation from design) and precision (consistency of results).
+Focus on a clinically relevant application (bone ingrowth).

Limitations

The study used a specific metal and printing technology, so results might not directly apply to other materials (e.g., plastics) or printing methods (e.g., FDM). The exact parameters for 'beam compensation' are not fully detailed.

Reliability & validity

Reliability is supported by the low standard deviation (<10%) in pore cell fabrication, indicating consistent results. Validity is addressed by measuring actual printed dimensions and comparing them to design intent and functional requirements (bone ingrowth).

Think critically

How might the observed consistent deviations in printed dimensions be leveraged or compensated for in future design iterations to more accurately achieve desired functional properties?

Design Principles

"Functional performance in additive manufacturing can be achieved through precise and reproducible process control, even when actual part dimensions deviate from nominal design values."

This research is crucial for the commercial production of advanced medical implants. It demonstrates that despite inherent inaccuracies in 3D printing processes, the resulting structures can still meet critical performance requirements like bone ingrowth due to high precision and reproducibility.

What This Means for Your Design

Even though 3D printers don't always make things exactly as designed, this study shows they can make the tiny holes in medical implants very consistently, which is important for them to work well.

How to use in your project

1.Reference this study when discussing the challenges and successes of fabricating complex geometries using additive manufacturing, particularly concerning dimensional accuracy and reproducibility.

Add to My Project

Quick Cite

Paragraph starter

This research highlights that while 3D printing of lattice structures for bone ingrowth may exhibit deviations from the initial design at the micrometer scale, the process can achieve high precision and reproducibility in pore cell uniformity. This suggests that functional performance, such as facilitating bone ingrowth, can be reliably achieved through careful process control and an understanding of inherent manufacturing tolerances, even if exact dimensional replication is not met.

Source

Research Square

Fabrication of a lattice structure with periodic open pores through three-dimensional printing for bone ingrowth

journal · 2022

View source

Questions About This Research

What does the research say about 3d-printed lattice structures achieve high precision for bone ingrowth implants despite design deviations?: When designing for 3D-printed porous structures, prioritize achieving high precision and reproducibility in pore characteristics over exact adherence to initial design dimensions, as the process inherently introduces predictable variations. Evidence: Research Square (2022).
Why does "3D-Printed Lattice Structures Achieve High Precision for Bone Ingrowth Implants Despite Design Deviations" matter for design?: This research is crucial for the commercial production of advanced medical implants. It demonstrates that despite inherent inaccuracies in 3D printing processes, the resulting structures can still meet critical performance requirements like bone ingrowth due to high precision and reproducibility.
How can designers apply this research?: When designing for 3D-printed porous structures, prioritize achieving high precision and reproducibility in pore characteristics over exact adherence to initial design dimensions, as the process inherently introduces predictable variations.
What were the main findings?: Actual average pore sizes achieved were 257.9 µm, 406.2 µm, and 633.6 µm for the intended 1.15, 1.5, and 2.0 mm designs, respectively.. Volume porosity ranged from 62% to 80% for the tested designs.. No strut breakage or gross deformation was observed in any of the printed specimens.. Pore cells were uniformly fabricated with a standard deviation of less than 10%, indicating high precision and reproducibility.
What research method was used?: Experimental analysis and measurement with Multiple specimens for each of the three design parameters (1.15mm, 1.5mm, 2.0mm), with 50 measurements taken for each specimen type..
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2022 journal from Research Square.
What should I do differently in my next project?: When developing 3D-printed implants or porous components, conduct thorough material and process characterization to understand and quantify printing inaccuracies. Use this data to refine designs or implement post-processing adjustments to meet functional requirements.
What are the limitations?: The study focused on a specific metal alloy and 3D printing method (selective laser melting). The observed deviations might differ with other materials or additive manufacturing techniques. The 'beam compensation' strategy's specific parameters were not detailed.