There are several software programs available for 3D printing, including:

1. Tinkercad: This is a beginner-friendly software that is easy to use for creating 3D models.

2. Blender: This is a free, open-source 3D modeling software that is great for creating sophisticated 3D models.

3. SketchUp: This is another beginner-friendly software that is easy to use for creating 3D models.

4. Autodesk Fusion 360: This is a professional-level software that is great for designing and manufacturing products. It has capabilities such as generative design, sculpting tools, computer-aided manufacturing (CAM), and 3D printing.

5. Siemens NX: This software is great for designing and creating advanced 3D models.

6. Solidworks: This software is great for designing and creating 3D models.

7. OpenSCAD: This is a free, open-source software that is great for creating 3D models using code.

In addition to modeling software, a slicing software is also needed to prepare 3D models for printing. Slicing software, such as Ultimaker Cura, digitally cuts a model into flat layers, which your printer can then print one by one. Other popular slicing software includes PrusaSlicer and Simplify3D.

Its important to note that the best software program for 3D printing depends on the users skill level, the complexity of the project, and the desired outcome. Beginners may want to start with Tinkercad or SketchUp, while professionals may prefer Autodesk Fusion 360 or Siemens NX.