Quality Assurance of Reference Specimens Manufactured by Continuous Liquid Interface Production Using Coordinate Metrology

M. Kain, A. Davoudinejad, D. Quagliotti, J. S. Nielsen, K. Liltorp, D. B. Pedersen, S. D. Farahani, N. Franke, G. Tosello*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review

51 Downloads (Pure)


Continuous Liquid Interface Production (CLIP) is an additive manufacturing (AM) method developed as an evolution of the Digital Light Processing (DLP) principle. Utilizing an oxygen-permeable window below the ultraviolet image projection plane, the step-wise motion of the DLP printer can be avoided by maintaining a persistent liquid interface, thus allowing for a continuous growth of the printed specimen. To investigate the capabilities of this new process, a state-of-the-art CLIP AM machine was utilized to manufacture a series of reference specimens developed following the design of existing metrological transfer standards. The reference specimens were measured by a tactile coordinate measuring machine (CMM) to assess the manufacturing capability of the CLIP printer. Measurands included dimensions of 1D, 2D and 3D geometrical features as well as form errors (flatness, roundness, sphericity). Specifically, a flat hole-plate containing a grid of 25 evenly spaced holes (nominal diameter 5.5 mm, nominal pitch 25 mm) was used to assess the in-plane printing accuracy and precision of the holes’ centres. Additionally, a ball-plate specimen containing 4 spheres (nominal diameter 22 mm) was produced measured to characterise the sphericity, as well as the printing accuracy and precision of the spheres’ centres. The metrological characterization of the two reference specimens by CMM metrology allowed to determine the production capability of the used CLIP machine, and to highlight advantages and limitations of the CLIP method. The traceability of the CMM measurements was established by performing an uncertainty assessment using the calibrated artefacts corresponding to the two additively manufactured CLIP specimens. Eventually, the data collected will enable adjustments for improving the manufacturing accuracy of the CLIP machine and for paving the way towards the quality assurance of production based on the CLIP technique.
Original languageEnglish
Title of host publicationProceedings of the 19th International Conference and Exhibition (EUSPEN 2019)
EditorsC. Nisbet, R. K. Leach , D. Billington, D. Phillips
PublisherThe European Society for Precision Engineering and Nanotechnology
Publication date2019
ISBN (Electronic)978-099577514-5
Publication statusPublished - 2019
Eventeuspen's 19th International Conference & Exhibition - Bilbao, Spain
Duration: 3 Jun 20197 Jun 2019


Conferenceeuspen's 19th International Conference & Exhibition


  • Continuous Liquid Interface Production
  • Additive Manufacturing
  • Quality Assurance

Cite this