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I made your bspline periodic with bspline.setPeriodic(). Its parameter range is 0 <= u < 1 Being periodic makes u + n (n integer) the same point for every n. Your u parameters go like 0 < val3 < val4 <val1 < val2 < 1 spline.trim(val3, val4) cuts out the segment between 3 and 4 as expected. However t...

Shouldn't your BSpline be a periodic one?

What I currently do is sqrt((<<Pt1>>.Placement.Base-<<Pt2>>.Placement.Base)*(<<Pt1>>.Placement.Base-<<Pt2>>.Placement.Base)) Is it possible to express this in a more convenient way? (<<Pt1>>.Placement.Base - <<Pt2>>.Placement.Base).Length

I’d maybe try https://wiki.freecadweb.org/Macro_Honeycomb . A fully 3D cellular structure would likely be not printable because of the overhangs. We did have someone come by about a year ago with a scheme for a random mesh with limited overhang angles. I don't know if he succeeded in implementing it...

You need to model the wing as a solid with a hole for the tube. Your slicer will allow you to choose the density of the infill structure and how many surface layers to make. It wont fill empty space. If the lowest working infill is too dense for your needs, you will have to model the structure yours...

App.Rotation(v1, v2) rotates v1 into v2 in the v1 - v2 plane. (There are an infinity of other possible rotation axes) Just type help(App.Rotation) into the Python console. Excerpt below: >>> help(App.Rotation) Help on class Rotation: class Rotation(builtins.PyObjectBase) | Base.Rotation class. | | ...

Using loft to point and polar pattern in Part Design looks simpler to me.

It appears this is a long-standing issue. https://forum.freecadweb.org/viewtopic. ... =4&t=12317

Is this a bug or a false alarm?

EDIT: It even fails for a full sphere.

EDIT2: Part|Create Primitives|Ellipsoid also fails geometry check. https://wiki.freecadweb.org/Part_Ellipsoid

It is a python list comprehension. https://www.geeksforgeeks.org/python-l ... rehension/ a compact way of transforming a list into another list without writing an explicit for loop.