Additive manufacturing of photopolymers using the Texas Instruments DLP lightcrafter

Hatzenbichler, Markus; Geppert, M.; Seemann, Rolf; Stampfl, Juergen

doi:10.1117/12.2001651

Cited by 15 publications

(8 citation statements)

References 2 publications

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“…DLP is a method, which can reach resolutions in the order of 25 μm [7]. Smallest feature sizes of 0.6 μm have also been reported [40], and resins filled with ceramic particles have been printed via DLP with layer heights of 15 μm and with lateral resolutions of 40 μm [18].…”

Section: Digital Light Processing Stereolithographymentioning

confidence: 99%

“…The fast switching speed of the DMD is a prerequisite for realizing grayscale illumination, which can be beneficial for precise control over exposure time and by extent energy dosage [40]. With its pixel-based exposure mechanism, DLP is excellent for illumination of sharp corners but can cause saw-tooth type surface roughness on otherwise curved surfaces [18]. Consequently, when aiming for higher resolution, the pixel size needs to be reduced with the help of designated optics.…”

Section: Digital Light Processing Stereolithographymentioning

confidence: 99%

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Stereolithography

Schmidleithner¹,

Kalaskar²

2018

3D Printing

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The stereolithography (SLA) process and its methods are introduced in this chapter. After establishing SLA as pertaining to the high-resolution but also high-cost spectrum of the 3D printing technologies, different classifications of SLA processes are presented. Laserbased SLA and digital light processing (DLP), as well as their specialized techniques such as two-photon polymerization (TPP) or continuous liquid interface production (CLIP) are discussed and analyzed for their advantages and shortcomings. Prerequisites of SLA resins and the most common resin compositions are discussed. Furthermore, printable materials and their applications are briefly reviewed, and insight into commercially available SLA systems is given. Finally, an outlook highlighting challenges within the SLA process and propositions to resolve these are offered.

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Section: Digital Light Processing Stereolithographymentioning

confidence: 99%

Section: Digital Light Processing Stereolithographymentioning

confidence: 99%

Stereolithography

Schmidleithner¹,

Kalaskar²

2018

3D Printing

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“…Many micro-SLA machines were built by different research teams using the DMD technology as dynamic mask [4,[36][37][38][39][40]. The first has been developed by Bertsch et al [41] in 1998.…”

Section: Figure 127 Diagram Of the First Projection Microstereolithmentioning

confidence: 99%

Microstereolithography

Bertsch¹,

Renaud²

2016

Three-Dimensional Microfabrication Using Two-Photon Polymerization

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“…In the literature, the nomenclature for these 3D printing systems has included continuous digital light processing (cDLP) [5], DLP-based 3D printing or stereolithography [6, 7], DMD projection printing (DMD-PP) [8], projection, mask projection, or DMD, micro-stereolithography (μSL) [9, 10, 11], or dynamic mask stereolithography (DMS) [12]. These systems are usually top-down projection approaches, but some utilize bottom-up projection like our device.…”

Section: Introductionmentioning

confidence: 99%

Digital micromirror device (DMD)-based 3D printing of poly(propylene fumarate) scaffolds

Mott

Busso

Luo

et al. 2016

Materials Science and Engineering: C

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Our recent investigations into the 3D printing of poly(propylene fumarate) (PPF), a linear polyester, using a DMD-based system brought us to a resin that used titanium dioxide (TiO2) as an ultraviolet (UV) filter for controlling cure depth. However, this material hindered the 3D printing process due to undesirable lateral or “dark” curing (i.e., in areas not exposed to light from the DMD chip). Well known from its use in sunscreen, another UV filter, oxybenzone, has previously been used in conjunction with TiO2. In this study we hypothesize that combining these two UV filters will result in a synergistic effect that controls cure depth and avoids dark cure. A resin mixture (i.e., polymer, initiator, UV filters) was identified that worked well. The resin was then further characterized through mechanical testing, cure testing, and cytotoxicity testing to investigate its use as a material for bone tissue engineering scaffolds. Results show that the final resin eliminated dark cure as shown through image analysis. Mechanically the new scaffolds proved to be far weaker than those printed from previous resins, with compressive strength of 7.8 ± 0.5 MPa vs. 36.5 ± 1.6 MPa, respectively. The new scaffolds showed a 90% reduction in elastic modulus and a 74% increase in max strain. These properties may be useful in tissue engineering applications where resorption is required. Initial cytotoxicity evaluation was negative. As hypothesized, the use of TiO2 and oxybenzone showed synergistic effects in the 3D printing of PPF tissue engineering scaffolds.

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Additive manufacturing of photopolymers using the Texas Instruments DLP lightcrafter

Cited by 15 publications

References 2 publications

Stereolithography

Stereolithography

Microstereolithography

Digital micromirror device (DMD)-based 3D printing of poly(propylene fumarate) scaffolds

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