Can I influence the way of the slicer?

Bambu Lab Software Bambu Studio
1

Hi,
I found some days ago a nice model at makerworld and printed it. I experianced some problems with the model and learned some things. I wish to share my experiance because they could be helpful also for others, but there are still some questions.

Maybe some experts could give an advice.

Note: its not so much that I need to print this model perfectly, but I belive that the same issues could also happen with other prints and than it would be good to know, how to solve them. (If there is a solution.)

You can find the model, a gecko here:

I printed it first with Bambulab PLA. At some points the tail did not print well. I examined the first layer in the slicer and the reason was obvious:

badTailLayer1
badTailLayer1755Ă—461 30.4 KB

In the second layer the tail is not interrupted. So the problem was not a bad first layer, but a missing print a the first layer. The second layer was partly printed into air. I enabled the option “thin wall detection” and then the first layer looked much better:

betterTailLayer1ThinWallDetection
betterTailLayer1ThinWallDetection755Ă—466 31.4 KB

Also the printed result was much better.

Than I printed it also with Bambulab PETg. It had again problems with the tail. I aborted the print. Some lines at the first layer are still not complete. Seems PETG is more sensitive.
So I moved the model 0.12 mm down at the z-axis. In fact I started the print with the second layer. Now this new first layer is ok:

betterTailLayer1Zdown
betterTailLayer1Zdown825Ă—462 27.8 KB

The print with PETg succeded. But as I removed the gecko from the plate the tail broke away. The reason is, that the tail is very weekly connected:

badTailWeekConection
badTailWeekConection831Ă—541 52.5 KB

Note: the slicer does not consider there to be a gap, it just follows allways the same way around. (I tried with diffent values for gap-filling.)
Please see my mark at the screenshot. I marked also a second point: at some layers the slicer does gap-filling, at others not. Why?

I had the idea to influence the way of the slicer selecting “random seem”. But there was no difference.

Now my question to the experts: is there any way to tell the slicer, that it should draw at some layers the lines as it did, and at some other layers a line from the body to the tail? (And start a new line for the other side of the body.)
I believe that the connection would than be much more stabil.

2

Hi,
try to use arachne wall generator and slicing mode “close holes” it should help…

image
image851Ă—747 137 KB

1 Like
3

A great example of a well-crafted quality post with great information to dig into. :+1:

The challenge with this or any model that simulate an organic structure is the inherent irregularity. As you noted in your first screengrab with contact voids.

I think you’re on the right track and @Flashy_DE suggestion is worth exploring.

4

Hi, thank you very much!
@Flashy_DE : for your great tip!!!
@Olias :for your nice compliment

I tried both options, first together, and (because this succeeded) then separate.
Arachne is the option which does wonder :grinning:
I had thougt about this option, but than discarded it and did not try it :smiling_face_with_tear: because I did not believe it would help.

The second point: please forgett it. Likely I confused myself with all the things I tried. Its not a gap at some layers, but the seem, and since I had tried “random seem” it was at some layers here and at some other layers somewhere else. And seems and gaps are drawn nearly with the same white.