Designs that are available on the internet Info for beginners.
For those who are new to the hobby of 3D printing don’t expect to find everything you want for free to download from sites like Thingiverse, cults3d, etc. Anything that is available has been shared by designers who are happy to share their files, a large percentage of people in this hobby don’t want to share their designs that they have spent time and money developing.
If you think designers should share their files for free and you therefore can print everything you need without designing anything then you’re in the wrong hobby. The designers who share their designs for a small fee are also doing this to help others but want a little something for all their hard work, material costs in development, research, and time spent getting the item to a position where it can be printed and shared.
The designs that are available on the internet that are free or go for a small fee are a selection of what people have done and will never be everything somebody needs.
Always respect those who are not willing to share their designs, it’s their designs and they can do with them what they want.
At the end of the day, you have two choices if you can’t find what you need. Option 1 is to design it yourself with a CAD package like TinkerCAD, Fusion 360, Blender, etc. Option 2 is to ask someone to design it for you, CGTrader.com has got a facility on its site to commission someone to do it for you but this is likely to cost money.
Always look to the internet to see if something is available and it may save you hours of work, the best place to search to see if anything is available is yeggi.com which is a search engine for the 3d world.