Mechanical parts - Layer adhesion - Filament
 
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jmf1
 jmf1
(@jmf1)
New Member
Mechanical parts - Layer adhesion - Filament

Hello,

I have to make some mechanical parts for a small Land Yacht. They have to survive sunny hot days, and some mechanical stress. The first attemps I made with PLA proved the idea OK, but PLA not really suitable: changed shape over time and heat, and broke at some points between layers.

I try to take stress into account for the part design, but I can't avoid some stress across the layers.

Which filament would you advise for this application, from layer adhesion perspective to achieve best mechanical resistance across the layers? PTEG ? PC Blend ? Other ?

Last, would annealing help in my case ?

I have seen the Carbon PC Blend, but I would like to avoid specific nozzle, and I believe that carbon will not change the layers adhesion aspect.

Best regards,

JMF

Posted : 21/08/2021 7:37 am
Diem
 Diem
(@diem)
Illustrious Member

PLA is ideal for first prototypes and design evaluation.  It's also one of the stiffest filaments and is surprisingly durable in suitable environments.

I try to take stress into account for the part design, but I can't avoid some stress across the layers.

You can orient the part on the bed to take account of anticipated loads or to vector some stresses across layers if necessary.

Which filament would you advise for this application, from layer adhesion perspective to achieve best mechanical resistance across the layers? PTEG ? PC Blend ? Other ?

Flex (eg TPU) has excellent interlayer adhesion but of course it's flexible...

Nylon, polycarbonate and PET all have differing degrees of toughness/resilience and would fare better outdoors than PLA.  I would probably experiment with PETG first, mainly because it's the easiest to print and is cheap.

Last, would annealing help in my case ?

Possibly.  It will strengthen the part but you can expect shrinkage; some simple shapes can be calibrated to take account of it but complex parts may distort too much.

Cheerio,

Posted : 21/08/2021 8:56 am
jmf1
 jmf1
(@jmf1)
New Member
Topic starter answered:
Start with PETG

Thank you for your feedback Diem,

I will start with PETG, if it looks as a good candidate.

Best regards,

JMF

Posted : 21/08/2021 6:04 pm
Peter M
(@peter-m)
Noble Member
RE: Mechanical parts - Layer adhesion - Filament

Asa is made for outside, check this one.

Nylon should be better, but check what happens if it is outside in the sun and water.

check PP is a strong filament, outside I do not know.

In general prints for outside, by black , no sunlight reaches the inside, and a few layers of paint to protect.

For all filament, make a temperature tower, and then print 10 degrees higher, so the lines stick better.

CPE you could check, at work they print these for building cars, the plastic part  is for pushing between parts to get it loose again, petg was not good enough.

 

Printing a Boat with EVERY FILAMENT

 

And a german guy on youtube has a few movies on the strenght of filament.

This post was modified 3 years ago 2 times by Peter M
Posted : 22/08/2021 4:41 am
Peter M
(@peter-m)
Noble Member
RE: Mechanical parts - Layer adhesion - Filament

CNC Kitchen is the German guy.

 

This post was modified 3 years ago by Peter M
Posted : 22/08/2021 4:47 am
CountrySmile
(@countrysmile)
New Member
Review

 

Posted by: @peter-m

Asa is made for outside, check this one.

Nylon should be better, but check what happens if it is outside in the sun and water.

check PP is a strong filament, outside I do not know.

In general prints for outside, by black , no sunlight reaches the inside, and a few layers of paint to protect.

For all filament, make a temperature tower, and then print 10 degrees higher, so the lines stick better.

CPE you could check, at work they print these for building cars, the plastic part  is for pushing between parts to get it loose again, petg was not good enough.

 

Printing a Boat with EVERY FILAMENT

 

And a german guy on youtube has a few movies on the strenght of filament.

Great post and thank you for sharing. I was considering that option and found this post so changed my opinion.

publixoasis
Posted : 13/09/2021 4:50 pm
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