Top Slic3r Alternatives for Your 3D Printing Needs
Slic3r has long been a go-to STL-to-GCODE translator for RepRap 3D printers, lauded for its speed, open development, and ease of use. It boasts features like reading STL, AMF, and OBJ files, generating G-Code and SVG, and providing both a graphic interface and a command-line API. However, with the rapid evolution of 3D printing technology and user needs, many are seeking a Slic3r alternative that might offer different features, better performance for specific setups, or a more tailored user experience.
The Best Slic3r Alternatives
Whether you're looking for more advanced features, a simpler interface, or support for a wider range of printers, there's a strong Slic3r alternative out there for you. We've compiled a list of the top contenders to help you find the perfect fit for your 3D printing workflow.

Cura
Cura is a highly popular and widely used Slic3r alternative, aiming to be an end-to-end solution for personal 3D printing with RepRap based machines. It is free and open-source, available across Mac, Windows, and Linux. While tuned towards Ultimaker printers, it's compatible with any RepRap based design, making it a versatile choice for many users.

MatterControl
MatterControl is a free, open-source app that allows you to organize and manage your 3D prints, making it an excellent Slic3r alternative focused on user workflow. It's designed to help you get the most out of your 3D printer, supporting Mac, Windows, and Linux. A key feature includes prototyping capabilities, aiding in iterative design processes.

Simplify3D
Simplify3D is a commercial Slic3r alternative known for its professional 3D printing software that streamlines the printing process, leading to better results. It's lauded as one of the fastest slicers on the market, offering customizable support structures. Available for Mac, Windows, and Linux, it's a strong choice for users seeking robust, high-performance slicing.

SmoothieControl
SmoothieControl is an open-source Android application for controlling SmoothieBoard based machines, including 3D printers, laser/plasma cutters, and CNC machines. While not a direct desktop slicer like Slic3r, it serves as a valuable control Slic3r alternative for mobile users managing their prints, offering prototyping features directly from Android phones and tablets.

IceSL
IceSL aims to make the latest research in modeling and slicing quickly available in powerful yet accessible software. As a free Slic3r alternative, it offers advanced capabilities for users on Windows and Linux who want to leverage cutting-edge algorithms for their 3D prints.

ReplicatorG
ReplicatorG is a free and open-source software that drives MakerBot Replicator, Thing-O-Matic, CupCake CNC, RepRap, and generic CNC machines. It can process GCode or STL files, making it a functional Slic3r alternative for users with these specific hardware setups across Mac, Windows, and Linux.

ideaMaker
ideaMaker is Raise3D’s powerful slicing software, offered as a free Slic3r alternative. It boasts a user-friendly interface that can prepare STL, OBJ, and 3MF files with just a couple of clicks. Available for Mac, Windows, and Linux, it's a solid option for those seeking efficiency and ease of use in their slicing workflow.

Repetier
Repetier is a free software for controlling RepRap style 3D printers like Mendel, Darwin, or Prusa Mendel, and works with most firmware types. Optimized to work with Repetier-Firmware, it serves as a robust Slic3r alternative that integrates control and slicing, available for Mac, Windows, and Linux, and includes prototyping features.

Microsoft 3D Builder
Microsoft 3D Builder is a free application for Windows that allows users to view, capture, personalize, and print 3D models. While not solely a slicer, it offers integrated capabilities for preparing models for printing and can serve as a convenient Slic3r alternative for Windows users looking for an all-in-one basic solution for 3D model manipulation and printing.
Ultimately, the best Slic3r alternative for you will depend on your specific 3D printer, your operating system, your skill level, and the features most important to your workflow. Explore these options to find the perfect fit and elevate your 3D printing experience.