(NooB) Same object, different build methods, different results?

[MikeZRed]

I've just started using FreeCAD (0.18 Rev 4), trying to design parts for 3D printing.

Adapting what I've learned from several tutorials, I built the same object two different ways, but there are unexpected differences and I don't know if they will matter when it comes to printing them.

1st method -
Created a body, sketched a square, padded the sketch to make a cube. I attached a new sketch to one face, drew a rectangle the full width of the face and 1/4 the height, then padded the new sketch (the 1/4 height measurement).

2nd method -
Created a body, sketched the 'L' shape to match the final profile of the 1st body, then padded it.


On the body of the 1st method, the side of the cube and the end of the 'leg' are selectable as separate faces, whereas on the body of the 2nd method the entire side is one L-shaped face.

Did I do the 1st method wrong? I would've expected the 1st method to create a solid face that matched the 2nd method.

Thanks in advance for helping a NooB.

Mike

Edit-
I installed .19 thinking it would install over .18, which it didn't, and didn't realize the shortcut was for the old version. Using .19 now.

[mendy]

Hi should upgrade to 0.19 or dev 0.20 as your description of issue doesn't match the file.

OS: Ubuntu 20.04.2 LTS (MATE/mate)
Word size of FreeCAD: 64-bit
Version: 0.20.25025 (Git) AppImage
Build type: Release
Branch: master
Hash: fb8b21ec43dca706a4aa2d63d59a4fb79f050369
Python version: 3.9.4
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.2
Locale: English/United States (en_US)

[drmacro]

And, don't attached to generated geometry.

Homework :
Topological naming problem
Advice for creating stable models
Basic Attachment Tutorial

[MikeZRed]

Oops... attached wrong file . Corrected attachment in original post.


Thanks for the homework assignment, drmacro - I will take a look at them all.

[papyblaise]

[ quote]Did I do the 1st method wrong? [/quote]
No
don't panic, the result is correct, because the faces created by face extrusion, remain independent even if the volume is a single object
you just have to do "Refine = True" to have only one side as in your 2nd example

[MikeZRed]

No
don't panic, the result is correct, because the faces created by face extrusion, remain independent even if the volume is a single object
you just have to do "Refine = True" to have only one side as in your 2nd example

I like it when the answer is simple
Thank you so much!

[chrisb]

The additional faces can be removed by setting Refine=true in the last feature.