Hi
If you do not give thickness, there can not be engraving , I think

Thanks Bejant I don't know this simplicity

Hi
Without any difficulty:
you draw line A, line B (sequential or not)
you select the points 1 and 2 of A, then the point 3 of B, you click the tool in the form of 2 arrow points against point,
and B joins the center of A, the two are united and can be constrained in any way

Hi Good luck with Freecad :!: If you select the back of the trapeze, trust Fc you have your back to you, but to make sure, you can rotate the view using one of the mouse buttons (I do not know MAC) so look for one which shows you a double rotary arrow (with W10, you have to tilt the wheel to the lef...

In the same vein here is a really damn long thing to do not difficult but long time
I had to delete a lot of mergers to have a file smaller than 1MB

Hi
You have to try to find a straight segment to avoid a projection in B-spline
In this case make a cross section "provisional"

Salut
En illustration voici un exemple proche de ton projet
ne compte pas sur moi pour te faire un rendu , j'ai un goût de chiotte (ce serait plutôt un vomi )

Hi I consider the object Cut (in blue) I make a carbon copy cut001 (in red) it contains all the element of Cut in carbon copy (sketch, pad, holes) and that I can move where I see as an object independent and you can also move it to another file I make a miror (in green) which I can change again Plac...

Non t'as rien compris, que se soit la vis ou la tige filetée , elles sont créées avec Fastener donc centrée en XY et Z = 0 C'est ensuite que ça change, la vis se laisse gentiment déplacée grâce à "Placement là où je veux qu'elle aille , mais pas la tige filetée qui résiste et revient toujours à...

Hi
uses the mirror tool through the center of the tube