TinkerCAD is a free-of-charge, online 3D modeling program that runs in a web browser.
TinkerCAD uses a simplified constructive solid geometry method of constructing models.
A design is made up of primitive shapes that are either "solid" or "hole".
Shapes can be imported in three formats: STL and OBJ for 3D, and 2-dimensional SVG shapes for extruding into 3D shapes. TinkerCAD exports models in STL or OBJ formats, ready for 3D printing.
Tinkercad also includes a feature to export 3D models to Minecraft Java Edition, and also offers the ability to design structures using Lego bricks.
How to use TinkerCAD
Login to TinkerCAD in the webpage
Select "Create new Project".
Add the elements of your design.
You can hold the Shift key and select multiple objects at the same time.
Selecting the "Group" option in the header bar joins multiple objects into one.
When "Hole" is clicked it gets subtracted in the final project.
Additional options allow you to Duplicate, Mirror, Copy and Delete individual items within the the particular design.
Combining both solid and hole-designated objects, you can create almost anything your heart desires.
How to Print the Design?
Step 1-
Click "Export" on the top right corner.
Step 2-Download the file (in the required format) and print the design with the device connected to the 3D Printer.
OR
Step 2 -Connect your 3D Printer, and print your design right away.
Step 3 - Print your design with the required material.
Step 4 - Sand and prime the prints.
Step 5 - Have fun with your new 3D Prints.