权利要求：
What is Claimed is:
1. A flame arrestor comprising: a cylindrical body, comprising: a first end, the first end having an end surface; a second end, the second end opposite the first end; a recess formed in the end surface of the first end, the recess defined by a recessed surface extending inward from the end surface toward the second end; and a set of channels formed through the body between the first and second ends, the channels extending through the recessed surface.
2. The flame arrestor of claim 1, wherein the flame arrestor is composed of multiple layers of a same material bonded together.
3. The flame arrestor of claim 2, wherein the flame arrestor includes stainless steel.
4. The flame arrestor of claim 1, wherein the recessed surface includes triangular surfaces that extend inward from the end surface toward the second end.
5. The flame arrestor of claim 4, wherein the triangular surfaces are angled at about 45° relative to the end surface.
6. The flame arrestor of claim 1, wherein the end surface is a first end surface, the recess is a first recess, and the recessed surface is a first recessed surface, and wherein the second end has a second end surface, the body further including a second recess formed in the second end surface, the second recess defined by a second recessed surface, the channels extending through the second recessed surface.
7. The flame arrestor of claim 6, wherein the second recessed surface is parallel to the second end surface.
8. The flame arrestor of claim 1, wherein the channels have triangular cross-sections.
9. The flame arrestor of claim 1, wherein the body has a head portion at or near the first end and a threaded portion at or near the second end.
10. The flame arrestor of claim 9, wherein the head portion and the threaded portion have substantially the same diameter.
11. The flame arrestor of claim 9, wherein the head portion has a hexagonal cross-section.
12. A method comprising: printing, via a three-dimensional (3D) printer, a flame arrestor on a substrate, the flame arrestor including a cylindrical body, the body including: a first end, the first end having an end surface; a second end, the second end opposite the first end; a recess formed in the end surface of the first end, the recess defined by a recessed surface extending inward from the end surface toward the second end; and a set of channels formed through the body between the first and second ends, the channels extending through the recessed surface.
13. The method of claim 12, wherein printing the flame arrestor on the substrate includes printing the flame arrestor vertically from the first end to the second end.
14. The method of claim 12, further including cutting the flame arrestor from the substrate along a cutting plane between the first end and the substrate.
15. The method of claim 12, further including forming threads on the body.
16. The method of claim 12, wherein the 3D printer is a powder bed fusion machine.
17. The method of claim 12, wherein the flame arrestor is printed from stainless steel.
18. A flame arrestor comprising: a cylindrical body having multiple layers of a same material bonded together, the body including: a first end, the first end having an end surface and a recess extending into the end surface, the end surface forming an outer-most surface of the first end, the recess defined by a recessed surface; a second end, the second end opposite the first end; and a set of channels formed through the body between the first and second ends, the channels extending through the recessed surface such that none of the channels extends through the end surface.
19. The flame arrestor of claim 18, wherein the recessed surface is formed by triangular surfaces that extend inward from the end surface toward the second end.
20. The flame arrestor of claim 18, wherein the body has a head portion and a threaded portion that are substantially the same diameter.