Right, all the above.
Consider this, the soap dish is a free download but printing it will require time and material. I don't think I want to invest either on something that may not work. In the description you say it is personal practice. This implies you are still learning the craft and possibly making mistakes. Do you have a printer? If you are going to be selling models exclusively for 3d print you should have the finished product pictured with the renders to show the files actually work. This is not an easy business. I have been here almost two years and just got my first review yesterday. You have to really want to do this and you need to believe in yourself.
So, don't tell your customers you are still learning,
get yourself a printer,
exclude the extra bits (the wall) and consolidate files into one package
do MORE research on 3d printing
download blender so you can offer fbx, dae and obj files.