Hello,
I am starting to build a Core XY 3D printer.
After reading the information given in [www.corexy.com] I came with the question about the need of the criss-cross pattern.
I understand that in a drafting table the criss-cross pattern is necessary because there are no shafts or linear guides to stabilize and keep the bar horizontal. But in a 3D printer we have shafts to keep the bar parallel.
So, having shafts that keep the carriage parallel, I think that what is still good about the Core XY configuration is that it keeps the belt length constant regardless the carriage position in the printing plane. So for the A belt, the configuration is great, but I don't see the need for the B belt to have that pattern.
Using a configuration like the one below, the red belt (A) is kept constant in length like in CoreXY, and the blue belt (B ) is simpler.
[attachment 83245 core_xy_alternative.png]
Maybe there is something that I am missing.
The benefits I see are:
- Shorter B belt and fewer pulleys.
- Avoid the criss-cross pattern, so the belts are separated. So there is no need to make 2 heights for the belts.
The drawbacks I can see are:
- The Y movement may be less even/smooth/stable because the belt only pulls from one side.
It seems to me that it may work, I made a fast prototype and its seems ok. I am going to make new printed pieces for this configuration to see better if I am wrong.
I am starting to build a Core XY 3D printer.
After reading the information given in [www.corexy.com] I came with the question about the need of the criss-cross pattern.
I understand that in a drafting table the criss-cross pattern is necessary because there are no shafts or linear guides to stabilize and keep the bar horizontal. But in a 3D printer we have shafts to keep the bar parallel.
So, having shafts that keep the carriage parallel, I think that what is still good about the Core XY configuration is that it keeps the belt length constant regardless the carriage position in the printing plane. So for the A belt, the configuration is great, but I don't see the need for the B belt to have that pattern.
Using a configuration like the one below, the red belt (A) is kept constant in length like in CoreXY, and the blue belt (B ) is simpler.
[attachment 83245 core_xy_alternative.png]
Maybe there is something that I am missing.
The benefits I see are:
- Shorter B belt and fewer pulleys.
- Avoid the criss-cross pattern, so the belts are separated. So there is no need to make 2 heights for the belts.
The drawbacks I can see are:
- The Y movement may be less even/smooth/stable because the belt only pulls from one side.
It seems to me that it may work, I made a fast prototype and its seems ok. I am going to make new printed pieces for this configuration to see better if I am wrong.