I want to share some of my creations such that you can get inspired.
Creating models for a 3D printer is not that hard. I use SketchUp and Blender to do quick sketches of what I want to create. However, SketchUp and other free modeling software are either hard to learn or have many limitations. Therefore I sometimes also use OpenSCAD together with openpyscad or SolidPython such that I can code my creations. I have also found SDFs to be a great way to create smooth volumetric models, using a SDF for Python library. This way I do not have any limitations and I get full control by using variables and other perks with programming, like for-loops and functions.
Recently, I have also had great success with using ChatGPT together with OpenSCAD and Blender.