What is your application program to create 3D design? I want to make 3D printing bussiness but i guess i have to learn a basic about 3D design.
To own a business with 3D printing you need to know your machine(s) extremely well to fix them when they break. I have run a small one for a couple months and it’s some work.
I design with solidworks but Fusion 360 is great and free.
Very ambitious to want to start a company knowing little about the technology or process. I CAD with freeCAD. Sometimes with blender.
I didn’t want to say it but @Jules_Hoehn hit the nail right on the head.
@Griffin_Paquette @Jules_Hoehn thank you guys… i’ll do several reseach to see which one i will choose…
I use Geomagic Design since Solidworks is too expensive
Preferably ones with cell lattice for infill (bored with standard infill) but I’d recommend free stuff 1st, or use free to learn cad program
Both cad and 3d printing have very steep learning curves so be prepared to do a lot of research by watching tutorial videos first to make sure you really want to do this for a business.
OpenSCAD all the way, with a little help from inkscape when needed. Works perfectly for my business needs and the items I produce.
@Peter_Hertel Let me guess. You rately use camfers or rounded corners?
@Marcus_Wolschon offset(10) offset(delta=-10) square(50); 
@Peter_Hertel
I still haven’t wrapped my head around how you can specify complex edges created by former operations to apply such operations on.
Blender
You really can’t go wrong with OnShape. It’s a professional grade in-browser modeling program.
I recommend onshape to start learning and have a great and continuously improving CAD. I use DesignSpark Mecanical because I want to be able to very quickly iterate and it has been great for that. A big minus for getting one locked in a proprietary format and for lacking basic tools in the free version like 3d text and mirroring parts. Very capable otherwise.
But I would learn onshape if I’d start over.
Fusion 360 isn’t bad, you would have to buy a license when you start making money, but it is a solid CAD package
Also free for life for hobbyist, if you find the form.
@Marcus_Wolschon The offset() method only works for 2D shapes which makes it somewhat limited of course.
Blender is the absolute lowest level solution there is, since you’re working with the mesh directly. Any problem with the mesh can be manually solved in blender. I’d recommend starting in a CAD program to get the dimensions worked out and then fine tuning in Blender