3D Printing?
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FreeCAD

Parametric 3D Computer-Aided Design (CAD)

Use CAD to create models of objects that can be printed with a 3D Printer

After FreeCAD model is created, export as an “stl” file.
PrusaSlicer can import the “stl” file, then export as a “gcode” file.
The “gcode” file is loaded into a 3D printer.

FreeCAD forum website => https://forum.freecadweb.org

Basics

Elliptical Hollow Cylinder?
--- Create elliptical cylinder that is hollow ---
Elliptical Hollow Sloped Cylinder?
--- Create elliptical hollow cylinder with sloped sides ---
Ellipsoid Shell?
--- Create ellipsoid half shell that is hollow ---
Remove Part of a Cylinder?
--- Create cylinder, then slice portion of cylinder ---
View Cross Section?
--- Create hidden objects, then view cross section ---
Create a Wedge?
--- There are two ways to create a wedge ---
Additive Sphere Shape Changes?
--- Clarifies Additive Sphere parameter options ---

Advanced

Convert an STL file into a Solid Model?
--- Create a solid model from an STL file ---
Convert an STL file into a G-Code file?
--- Create a G-Code from an STL file ---
Surface not Parallel to Plane?
--- Clarifies modeling surfaces that are not parallel to the xyz plane ---
Stick with a Pointed Hole?
--- Clarifies making a pointed hole ---
Bind Two Cylinders?
--- The middle body follows changes in top body and bottom body ---
Downspout Extender Using Additive Subtractive?
--- A downspout extender is created using Additive and Subtractive ---
Finger Digit Prosthetic?
--- Create a prosthetic for a finger digit ---