Material Strength Test Sample
by rsilvers, published
I print samples, then use three Carabiners to pull them apart, and see which one fails first. I recommend that you weigh your samples to make sure that you are doing a fair test. Whichever one breaks first, make more samples of it with more layers until it breaks second, and then weigh that - to see how much you had to add to it to overtak the stronger material. Note that the type of infill that you use will make a difference.
Preliminary results - I weighed the two samples on an Ohaus laboratory scale:
The trimmer-line sample was 6.10 g. The T645 was 5.47g. The T645 broke. This test needs to be repeated with the T645 weighing the same or more. I can increase the extrusion multiplier by 12%.
I completed the second test. This time I made sure that the weights were closely matched through control of the extrusion multiplier. 5.86 grams for the trimmer line and 5.93 grams for the T645. That is less than 1.2% difference. This time the T645 won. I set up tow straps with my Sequoia, and the samples did not break when I took my foot off the brake and let the truck creep forward. They just stopped the truck from moving! Then I gave more gas and the blue snapped. I bet these can support my weight many times over.
From these very limited sample points, it appears that the T645 is stronger, by at most about 9.7%.
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Is it just me or dos it look like the carbine has a different shapes in each end?
(Changing the way the pressure is applied)
In my crush tests, they were about the same:
I have not have feeding problems with the trimmer line. I have not had contaminants. I am using a 0.40mm nozzle. I have not noticed diameter variation. 240C (as measured by a Printrbot) is the best temp so far.
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