On 2/14/2023 at 4:29 AM, gr5 said:Here's a guide I made to help choose filaments. You can zoom in with the mouse. There are 2 charts. The first one has to do with the 2 paramaters that usually describe strength. The second chart has to do with temperature and ease of printing.
There are gains to using CF or GF. But they are small. If your parts are breaking already then maybe you need to redesign the shape, or use metal (e.g. rods or screws) or fiber or come up with a whole new approach. If you are going to print with GF or CF you really should get a bondtech feeder.
First you should understand the relationship between strength and flexibility. What some people call "strong" or "tough" is actually weaker but more flexible and so tougher. the more flexible, the more likely the part can survive being driven over by a car. But if you are using the part only under tension (rare but still), flexibility is not important or helpful and strength is more important. Another way to look at it: stiffer parts tend to be more brittle. Like glass. Steel is an exception. So nylon is slightly weaker but much more flexible than PLA or PETG. So Nylon tends to be extremely durable and tough but it's not good for making gears (too flexible!). Add some glass fibers and you can get the best of both worlds but the GF and CF fill are very small pieces so the added strength and stiffness is not nearly as good as long fibers. You might only get 20% improvement.
Thank you, is really cool the data treatment. I am trying to replace lateral ss parts of a packaging machine conveyor with 3d printed parts, the thing is that since the part changes in orientation is difficult . I guess I will have to split the part to keep orientation along the xy and use bolts.
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gr5
Go back to the first post on the first page of this thread. I added a corrected link.
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gr5 2,235
Here's a guide I made to help choose filaments. You can zoom in with the mouse. There are 2 charts. The first one has to do with the 2 paramaters that usually describe strength. The second chart has to do with temperature and ease of printing.
http://gr5.org/mat/
There are gains to using CF or GF. But they are small. If your parts are breaking already then maybe you need to redesign the shape, or use metal (e.g. rods or screws) or fiber or come up with a whole new approach. If you are going to print with GF or CF you really should get a bondtech feeder.
First you should understand the relationship between strength and flexibility. What some people call "strong" or "tough" is actually weaker but more flexible and so tougher. the more flexible, the more likely the part can survive being driven over by a car. But if you are using the part only under tension (rare but still), flexibility is not important or helpful and strength is more important. Another way to look at it: stiffer parts tend to be more brittle. Like glass. Steel is an exception. So nylon is slightly weaker but much more flexible than PLA or PETG. So Nylon tends to be extremely durable and tough but it's not good for making gears (too flexible!). Add some glass fibers and you can get the best of both worlds but the GF and CF fill are very small pieces so the added strength and stiffness is not nearly as good as long fibers. You might only get 20% improvement.
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