Are 2 walls enough or is this just bad beginners luck?

3D Printing!
1

I’m nearly done with my first print and I’ve had two cracks occur from dry fitting parts.

Settings are all unmodified from the downloaded files, using well dried PETG on a P1S.

2 walls, 15% gyroid infil. 0.4MM nozzle and 0.2MM layer height

Maybe its just a matter of getting more comfortable with the assembly/fit up? But it feels like these are too fragile.

20260214_172139
20260214_1721391920×2560 681 KB

2

second pic as i could only add one per post

20260215_073728
20260215_0737281920×2560 616 KB

3

I had the same problem with my first chair. All the replacement parts and everything I have printed since then has been with 3 walls. I haven’t had any issues since then. Takes a little more filament but still less than replacing parts

1 Like
4

thanks for your feedback, I will do some more investigating if this is a common problem and we need to update the profile

2 Likes
5

Thanks. Even if these can be put together by an experienced maker without cracking, we have to consider that the people getting them won’t have any experience and may have to take them apart at some point.

I’ll lay out the time and weight impact of 3 and 4 walls to see if the trade off is worth it. A little extra time up front is easy to justify for a product like this

2 Likes
6

So far in my experience 3 walls have been plenty. Not one part has cracked since making that change.

1 Like
7

I got my first one dry assembled.

I think there were three factors at play. First timer, support removal/cleanup, and weak walls.

With experience and better diligence on the assembly and prep, 2 walls is likely sufficiently strong, but I don’t think there is a lot of margin there and when you combine that with the very long print time, the need to remake a broken part is frustrating.

I’d advocate for 3 walls (assuming a 0.4MM nozzle) but I’m going to print my next with a 0.6MM nozzle and 2 walls to see how that does.

Support cleanup and prep needs to be on point (as it should be) but there were a couple spots that I overlooked and contributed to the challenges I had.

20260216_222246
20260216_2222461920×2560 1.05 MB

3 Likes
8

Looking at your pictures, I’m wondering if your printer is underextruding? If you look at the broken parts you’ll see they don’t just break along the layer lines…indicating weakness in the material. That 2nd picture of yours should have broken cleanly along the layer lines, not diagonally across layers.

Just an observation, but the parts I printed with 2 walls were very strong.

FWIW, those colors are pretty cool!

1 Like