How to properly add curves?

[LostInTranslation]

I often build symbols and logos out of simple shapes, or at least I dabble around with them to get ideas.

Sometimes, I'd like to combine (add) certain elements to get one curve.

Even if I turn on snapping and position every element dead next to each other, there will be visible gaps inbetween.
Worst of all, if I add those curves, the former gaps show up as lines through the curve. Sometimes I can delete them, but most often this will totally break the rest of the curve.
(see example, left are the parts, right after "Add" curves.

Is there a trick or workaround, how to flawlessly and beautifully combine multiple shapes to a single curve?

[firstdefence]

Sometimes it's about accurate placement of the nodes, if you zoom in you will likely find things are not as well placed as you think. having snap to geometry on and snap to grid off can help.

This will Merge cleanly.

[LostInTranslation]

Thanks, that sounded plausible at first, but did not work in my case.
Maybe because your shape was constructrd differently, with less shapes?

I tried different methods of geometry snapping, with grid snapping off, but I always get the same result.

Try if you like:

 

8.afdesign

[Alfred]

Where there are adjacent line segments (e.g. at the top and bottom of your example) drag on the middle of one of them with the Node Tool to create an overlap. They will then add cleanly.

[LostInTranslation]

2 hours ago, Hens said:

Here you go

Steps
Ungroup>ctrl+a>give stroke of 0,1 px>expand stroke>ctrl+a>add
Optional = Add a new stroke of 0,1 px>expand stroke>select both shapes(the old stroke and fill)>subtract

8.afdesign

That works perfectly, thank you!