Update on CF PETG parts from Ryan?

Mostly Printed CNC - MPCNC Advice
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Hey Guys, I’ve seen little comments here and there that Ryan is testing out some PETG CF parts for a build.

I can’t find a thread on it anywhere though. I was hoping someone or CNC man himself could point me to a recent thread or update us on how it went.

I’m getting ready to rebuild my burly or convert it into a Primo!

I bought a Bambu Lab Mini a month ago and excited to print some big parts on it. I’ve done a few prints with the PETG CF and I love the look.

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In this filament chart from Bambu PETG CF is slighter stiffer than PLA with better heat resistance and toughness. PLA CF is very stiff but lacks the toughness and heat resistance.

Would love to hear more!

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I know he has been printing some PET-CF (or if might be GF. I can’t remember for sure) and from what I remember he is liking it a lot

@vicious1 what’s your thoughts as of late?

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The PETG-CF I used was a bit less rigid than regular PLA for sure. It prints easily (as long as you have a hardened nozzle).

The real good stuff, PET-CF is super super rigid. It is super brittle on the spool, It takes higher temps 290-300 to print, but after it prints it is some good stuff. Currently, it is expensive but I hope that starts to drop. PET-CF/GF is some next level stuff.

I think a killer combo would be PETG-cf/gf for the regular parts and print the key parts in PET-cf/gf

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Have you had success printing PET CF on an open frame machine?

Because I have been saving up my maker world points and have enough to buy a few rolls of their PET CF.

But I only have the A1 mini right now. I could enclose it in a box or something.

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Yup. Bed at 70c nozzle at 290-295. Definitely needs some fan for overhangs and bridges. Even though it says not to.

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What key parts would you suggest to print in PET CF? Do you think it could be 1KG worth or less?

I’ve got a roll of ERYONE PETG CF I could use for the regular parts. And just get 1 roll of PET CF

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Core and core clamps. I think that should be worth it. 1kg is enough.

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First test print of PETG CF. I dried the filament for 8 hours at 65C a few days ago. Printed open air on my A1 Mini.

I couldn’t see any warping once the print had finished (which happens with normal PETG sometimes).

The part looks very nice. Overhangs are not bad.

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I’ve decided to rebuild my burly or build a scratch new Primo. I’ll make a proper build thread in the Builds section soon.

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My vote

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So I’ve been printing out my corner parts for the Primo build in PETG CF. They look fantastic. But I’m concerned about the rigidity. I’m using Eryone PETG CF which has no data sheet. Some filled filaments use small fibresn (good) and some CF powder (bad).

I don’t think the corner parts will make much difference to the cutting when printed in PETG CF. But for the Core and Clamps I think standard PLA might be a smarter option.

Struggling to find PET-CF at a decent price in stock. So I might get SUNLU PLA for the core.

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There should not be a huge difference but PLA is more rigid. I think either way you would be fine.

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Okay that’s good to know.

Do you have any advice on infill pattern and settings for the core and core clamp? As these are the killer things to get right it seems.

So far my settings have been:

  • 4 perimeters and 45% infill in crosshatch pattern (new Bambu lab filament similar to rectilinear)

I’ve been doing some searching about infill.

  • it seems gyroid is most isometric (strong in all axis evenly)
  • rectilinear or triangular are most rigid. But rectilinear is more battle tested on here so I’d choose that.

I’m sure it’s not a critical choice but as I’m using petg I’m trying to give myself the most rigidity.

Would love your thoughts!

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It is all listed in the instructions page. 2-3 perimeters. If you do more than that, some places do not get infill and it is detrimental if the parameters are not stuck together well.

Petg is extremely…NOT rigid.

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https://www.amazon.com/Siraya-Tech-Fibreheart-PET-CF-Filament/dp/B0CSPFL7MB

On my list of filament to try once I can get packages again.

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That is a good price!

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@vicious1 Are these parts usable? It’s gotten hot in the last few days and now I’m struggling with good overhangs.

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Yeah they should be fine.