Based on KNK force manual for c3: https://www.iloveknk.com/0um/Force-with-C3/KNKForce-with-C3-UM.pdf

1)Make sure you have version 0.92.3 installed or later

2) Start with a new file. Go to Documents>Preferences and make the following changes:
  1. Change Display units to px 
  2. Set Scale x: to 1.0 

3) Create your design. Note that at this point, you can change the display units above the document to inches
(or mm, cm, etc.) as desired.

4)  Refer back to the prior section regarding required steps for circles, ovals, text, and other shapes:
Inkscape doesn’t automatically convert text or some of the basic shapes into cutting paths before saving the
file. Thus, certain shapes will not be recognized when imported into C3 unless:
• For all circles and ovals, select them first. Then go to Path>Simplify. If you neglect to do this step, these
shapes will cut random patterns. Do not use this step on shapes with straight lines.
• For text, select and go to Path>Union. Even if your letters are not overlapping, applying a Union will ensure
that the text is cut correctly.
• For all other shapes, before saving as an SVG file, select one layer at a time and go to Path>Combine.
Note that if you have circles and ovals on layers that contain straight line shapes, they can be a part of the
Path>Combine step, as long as you’ve first performed the Path>Simplify on them. The same is true with
text – after applying Path>Union, you can include that text with other shapes when applying
Path>Combine.

5) Before saving the file, go to Extensions>Document and apply DPI 96 to 90. Then proceed with the
following step. 

6) Exporting Files as SVG:
• When saving a file in Inkscape, always use Inkscape SVG (*.svg) under Save as type. There are other
SVG options in the menu, however they will not render correctly in C3:

7) (Opt) Layout Mode: knk manual p 4-15

Tool Mode – Without the Large Document Area
• To make the document area equal to the bounding box around the shapes:
 Go to File>Document Properties, select the Pages tab.
 Under Custom Size, click the box next to Resize page to content.
 Click on Resize page to drawing or selection. This will then change the document size (Width and
Height) to be the boundary box around the shapes.

https://www.drupal.org/docs/updating-drupal/updating-drupal-core-manually

For InkScape 1.0.2 you need to add an extension to be able to easily round corners from your nodes vertices.
Here is the lin to use: https://inkscape.org/~jnweiger/%E2%98%85round-corners

And the link to setup: https://github.com/jnweiger/inkscape-round-corners?tab=readme-ov-file

Basically you need to download a package inclueded 2 files to be put in your programFiles/inkscape/../extension/ 

” (check Edit -> Settings -> System to find its location):

For inkscape 1.0.1 and later, copy

• round_corners.py
• round_corners.inx

For inkscape 0.92.4 and earler, copy

• round_corners.py
• round_corners.092_inx (renamed to end in .inx) “