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Slightly flexible material or material that can best withstand tension

Bengt
(@bengt)
Trusted Member

I have printed an adapter that basically is a cylinder of about 4 cm diameter but at one end it is slitted because it must grip over a lip of 1 mm. This requires the cylinder to flex a little bit and this is very demanding for the material as is must flex a little bit to slide over the lip.

I will probably slit it into at least 4 peaces and maybe add an external ring that can be slided over the area to secure the grip but the material must still be able to flex.

I have tried with PLA before but it cracks very easily. Suggestions for best choise?

Quote
Topic starter Posted : 7th April 2021 9:55 am
BHudson
(@bhudson)
Former USA Robox Support Moderator

@bengt Nylon would be my first choice for something like this. Polycarbonate or ABS would be second, depending on the other needs of the part. nGen Flex is a good alternative if you need overall flexibility. 

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Posted : 7th April 2021 3:36 pm
Mike
 Mike
(@17bt)
Prominent Member

@bengt If you're going to slit it use a higher infill density, and I'd use concentric infill. This was a car distributor clamp I made for a test rig, the indent near the top was to hold a Jubilee clip, and I only used one slot, with a larger hole to reduce stress as it gripped the body. the first few I made were using a carbon fill, had more slots, and default 20-30% fill density, and they didn't last - they just snapped, but this version is still going strong. PET-G can flex a little too, depending on the thickness, so although Nylon is very tough, it needs to be well stored to get the best results.

1617920695-concentric-infill.png

This post was modified 8 months ago 2 times by Mike
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Posted : 8th April 2021 11:22 pm
Bengt
(@bengt)
Trusted Member

Concentric infill, smart! I will try that. Unfortunately I don't have the recommended materials. These are what I have: Titan-X, nGen CO-PET, PolyMide CoPA, Carbon Fill, ASA-X, HDglass PETG, PolyWood, PolyFlex.

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Topic starter Posted : 9th April 2021 6:58 am
Mike
 Mike
(@17bt)
Prominent Member

@bengt I'd try the HDglass PETG, as it has good layer adhesion so unlikely to shear when "stretched" over that 1mm lip, but obviously the smaller the diameter the greater the stresses pro rata.

Good luck

Mike

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Posted : 9th April 2021 7:19 am
Bengt
(@bengt)
Trusted Member

Thanks again. There are so many parameters to be aware of about the materials. Layer adhesion is one important factor if the part is stressed. I will make a note about in my material list.

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Topic starter Posted : 9th April 2021 7:23 am
BHudson
(@bhudson)
Former USA Robox Support Moderator

@bengt PolyMide CoPA is nylon. https://us.polymaker.com/product/polymide-copa/

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Posted : 11th April 2021 12:42 am
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