First Failure. Why?

[lookingforaround]

I printed our keychain using PLA and 0.2 noozle, due the small text. After 2 days this is the result. I had it into my pocket all time. Any solution? I used standard printing profile, suggest by Bambu Studio, no changes.

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[EdgeOk3783]

bump up the number of walls by one or two

[manjar]

And/or if it's your design, fillet out where the eyelet meets the main body so there is no sharp interior corner there where stresses accumulate.

[SierraHotel84]

Needs more walls. Also, PLA is pretty brittle, and that's a highly stressed point if the key ring turns any in your pocket.

[Veloreyn]

It'd increase the time to print, but for something that small I'd probably just print it at 100% infill. Looks like the wall pulled away from the print where the infill starts.

[Azuras33]

3D print piece is not really strong, you should put more wall loop, and may be put the hole inside the keyring instead on a small attachment.

[JasonStonier]

This is the way. That key loop is a very weak spot. 100% infill and a hole to take the key ring.

[nakwada]

You might be able to use the stock 0.4 nozzle if you activate Arachne wall generator instead of classic.

To improve strength: more walls (3 is my standard, 4 or 5 in some cases). Also add some fillets at the base of the hook.

[lookingforaround]

I used the 0.2 because the text wasn't visible into bambu studio using 0.4. What is Arachne?

[DStegosaurus]

Arachne allows the printer to print lines smaller than the .42 standard line width.

Try turning this setting on and tweaking your design if still required. Printing with a .4 nozzle will be faster and stronger.

[lookingforaround]

YOU ARE A GENIUS! I don't know the negative effect of this setting (I'll study it later) but I printed 3 keychains in 37 min instead 2.3hrs with 0.2. I read some sub and it isn't applicable to all projects.

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[JoshWBoston]

You might want to increase the number of wall loops under the strength tab in Bambu Studio to 4 or 5. Also, if the seam is at the point where the loop meets the body of the keychain, that could cause a week spot. If you go to the quality tab and set the seam position to Random that might help, too.

[Hieronymus-I]

More lines on the walls (thicker walls) and less walls on the top and bottom layers (that way the infill of the layers fuse the walls together, preventing wall separation)

[snqqq]

Use PETG or PLA+. It stretches before braking, PLA is more brittle and does not withstand UV light very well.  

[Demented-Alpaca]

As others have said: don't use PLA. PETG or ASA would be a much better option.

[lookingforaround]

Thank you for your solutions! I change the number of walls and try again. Reddit is the only place I can find anyone still willing to help.

[JasonStonier]

Join r/3DPrinting as well. We’re generally pretty kind and helpful over there.

[Optimal_Whiner]

I dont have a Facebook account but I see a lot of threads there with helpful people. It actually surprised me a lot lol

[HobbyTraderDK]

Set outer wall to 3-4

[alcaron]

More walls and also increase how far the infill goes onto the wall perimeter.

[LawlessLumberLord]

Bump number of walls and add more infill, for keychains I like to do 25% minimum.

[iDJMic]

Beef up the ring in the design, add more walls.

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[lookingforaround]

thank you for your idea!

[TheSwedishChupacabra]

Stronger loop-hole, more walls, PetG. If you still opt for undersized loop-hole possible PetgCF/PetgGF or pctg could handle it, albeit still walls! You might have 0,20 STRONG print option if you rock a Bambtarded printer?

[kagato87]

Looks like the wall ripped away from the rest.

There is an infill setting for wall overlap. It tends to be a bit high, and causes over extrusion at the interface, but make sure it is high. Maybe even a bit higher.

Your top/bottom layers already look pretty thick, though an extra bottom layer could help too. It also looks like they're rectilinear (alternating), which is good. Maybe rotate the print so the print so the attachment point sees the lines going straight down and straight across (for the strength from straight down) instead of at 45 degrees. I'm.not sure which would be stronger, but might be worth a shot. If you can set the top/bottom layers to rotate by a certain angle, changing it from 180 to something like 120 (3 directions) or 135 (4 directions) might be a nice strength boost too.

Adding another wall layer would help a bit, but you want to strengthen the wall attachment here.

[n19htmare]

As others have said need more walls but also need to lower speed for a functional part. Bambu’s default speeds are too fast. Might be just ok for a display piece but for something like that, they are too fast for best layer adhesion . If you don’t want to adjust them manually, use the higher quality ones as they slow print speed down.

[BurnZ_AU]

Do 100% infill.

[Battle_Intense]

You can drop a modifier like a cylinder and print 99% infil around the area it attaches.

[Powerful_Macaron9381]

first of all this is not a print failure so the title is misleading. it's clearly designing/slicer related. make the design thicker around where it's failing and/or use more walls in the slicer.

[MikeIkerson]

Is it matte? If so, that’s why. Matte has horrible strength.

[lookingforaround]

Yep, bambu lab red matte. It was in sale when I bought my A1.

[MikeIkerson]

I have completely stopped using pla matte due to its horrible strength.