A 2026 Frontiers in Medicine study evaluated 42 non-critical medical-device spare-part models made in-house with PLA FDM. Its most transferable feature is the risk boundary, not the reported savings.[1] This is a manufacturing-risk and qualification discussion, not clinical advice or a DIY replacement guide.
Non-critical has a narrow meaning
The researchers screened candidates with a Function-Contact-Load matrix and admitted only F0, L0, and C1-or-lower parts.[1] Electrical insulation, patient-contact surfaces, radiation shielding, and primary load-bearing parts were excluded.[1] A simple plastic appearance is therefore insufficient; function and the consequence of failure determine candidacy.
PLA offered printability and cost advantages in the study, but the paper identifies limited heat resistance, interlayer anisotropy, and sensitivity to high-temperature sterilization.[1] Material name alone cannot establish compatibility with a use environment or cleaning protocol.
The adjustment history belongs in the manufacturing record
Across 210 critical measurements from 42 models, mean dimensional error was 0.18 ± 0.07 mm and remained within the study’s preset ±0.5 mm tolerance. First installation success was 92.9%.[1]
Initial prototype success was 85.7%, or 36 of 42 models. Six showed local warpage or undersized holes. Orientation changes, brims, and 0.1–0.2 mm dimensional compensation were used before acceptance.[1] The reusable record must therefore include orientation, support, compensation, post-processing, measurements, and rework, not only the mesh file.
Transfer the method cautiously, not the percentage
The study reports mean printed cost of CNY 66.86 versus CNY 530.92 for OEM parts, an 87.4% reduction.[1] The 20-part paired comparison used convenience sampling based on complete data and high utilization, which may favor positive outcomes. The authors also could not exclude supply-chain recovery or unrelated procurement improvements from the downtime change.[1]
EyeContact would start with an exclusion list, then one bounded candidate governed by drawing rights, revision control, material batch, machine and process settings, post-processing, cleaning, dimensional and durability evidence, and a named approval authority. Local labor, failures, inspection, documentation, utilization, and regulatory costs belong in the comparison.
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