Systems and methods of flexible substrates for additive fabrication
According to some aspects, a method of additive fabrication is provided wherein a plurality of layers of material are formed on a build platform, the method comprising forming a layer of material in contact with a substrate and further in contact with either a previously formed layer of material or the build platform, the substrate being an actinically transparent, flexible, composite material, and subsequent to the forming of the layer of the material, actively separating the layer of material from the substrate.
1. A method of additive fabrication wherein a plurality of layers of material are formed on a build platform, the method comprising:
forming a layer of material in contact with a substrate and further in contact with either a previously formed layer of material or the build platform by directing a source of actinic radiation onto a liquid photopolymer held by a container, the container comprising the substrate,
wherein the substrate is transparent to the actinic radiation, is flexible, and is a composite material comprising a ply of non-woven fibers of a first material bonded together in a random fiber matrix and embedded in an elastomeric material,
wherein the substrate has a thickness between 50 μm and 500 μm,
wherein the ply of non-woven fibers has a thickness between 25 μm and 500 μm, and
wherein the thickness of the substrate is greater than the thickness of the ply of non-woven fibers; and
subsequent to the forming of the layer of the material, actively separating the layer of material from the substrate.
2. The method of claim 1 , wherein the first material and the elastomeric material have substantially the same index of refraction.
3. The method of claim 1 , wherein the ply has a thickness less than the thickness of the substrate.
4. The method of claim 1 , wherein the non-woven fibers of the first material are glass fibers.
5. The method of claim 1 , wherein the elastomeric material is polydimethylsiloxane (PDMS).
6. The method of claim 1 , wherein the fibers are predominantly aligned along a first axis that is parallel to a surface of the substrate.
7. The method of claim 1 , wherein the substrate has a thickness of between 50 μm and 200 μm.
8. The method of claim 1 , wherein the substrate is suspended over an opening opposing the build platform.
9. The method of claim 1 , wherein the substrate has an oxygen permeability that is within 5% of the elastomeric material's oxygen permeability.
10. An additive fabrication device, the device comprising:
a build platform coupled to one or more actuators configured to move the build platform in a vertical direction, the build platform having a build surface that is planar in a horizontal direction;
a vessel having an interior surface of which at least a portion is formed from a flexible composite material comprising a ply of non-woven fibers of a first material embedded in an elastomeric material,
wherein the composite material has a thickness between 50 μm and 500 μm,
wherein the ply of non-woven fibers has a thickness between 25 μm and 500 μm, and
wherein the thickness of the composite material is greater than the thickness of the ply of non-woven fibers; and
a source of actinic radiation arranged to direct actinic radiation through the composite material onto the build surface,
wherein the composite material is transparent to the actinic radiation.
11. The additive fabrication device of claim 10 , further comprising one or more actuators configured to move the vessel in the horizontal direction.
12. The additive fabrication device of claim 10 , further comprising a wiper configured to move across an exterior surface of the vessel whilst contacting the exterior surface, the exterior surface being opposed to the interior surface.
13. The additive fabrication device of claim 10 , wherein the first material and the elastomeric material have substantially the same index of refraction.
14. The additive fabrication device of claim 10 , wherein the vessel is coupled to one or more actuators configured to move the vessel in the horizontal direction.
15. The additive fabrication device of claim 10 , wherein the ply has a thickness less than the thickness of the substrate.
16. The additive fabrication device of claim 10 , wherein the non-woven fibers are glass fibers.
17. The additive fabrication device of claim 10 , wherein the elastomeric material is polydimethylsiloxane (PDMS).
18. The additive fabrication device of claim 10 , wherein the composite material has a thickness of between 50 μm and 200 μm.
19. The additive fabrication device of claim 10 , wherein the composite material is suspended over an opening opposing the build platform.