0.025mm vs 0.05mm vs 0.1mm Mechanical Properties?

Does anyone has any valuable clue as to how the layer thickness is related to the mechanical properties of the form? (shock resistance, stiffness, etc.)

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FL test show the print to be isotropic

All layers cure together, so the layer thickness does not change the mechanical properties

Seconding @alan1950’s comment on isotropy. You should check out this blog post on Validating Isotropy in 3D Printing. The materials form cross-linked chemical bonds when cured so material properties are homogeneous throughout.

There is no true isotropy here for practical purposes, due to how the light passes through the EPDM (fresh or worn), as well as different pigments and blends. Some combinations will inhibit depth cross linking more than others, and there does not appear to be a way to compensate for the variable laser output over time (given the same driving current). Isotropy in a controlled environment doesn’t translate very well into real world, but all resin-based manufacturers face those issues. I am excited about what Formlabs has been able to accomplish at the current price point, in producing multiple resins and evolving the art. Even though floating the resin on water would provide a more-consistent cure surface, as well as easier peel, it alters the isotropy more than the EPDM or future flex tank that preserve more of the reactive layer.

“there is no true isotropy” Like saying we have no true president.

EXCEPT FormLabs tests would say otherwise . . . not about the president!

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:slight_smile: "Isotropy in a controlled environment doesn’t translate very well into real world, " 25u cure depth vs. 100u gives different cross-linking due to the universal tendency for thick cure layers to self inhibit at partial cure, not unlike leadership suffering as bureaucracy is piled higher and deeper. Of course that could cushion or even disguise bad ‘leadership’.