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Orca Slicer (also written as OrcaSlicer) is the most popular open-source 3D printing slicer, and for good reason. It's free, supports hundreds of printers, and has the most advanced calibration tools of any slicer available. Built on Bambu Studio, Orca Slicer gives you more control over every aspect of your prints.
Current version: v2.3.1 (October 2025) · Price: Free · Platforms: Windows, macOS, Linux
3D printing is a fascinating technology that allows you to create almost anything you can imagine. However, it also comes with some challenges and limitations, such as the quality of the printed parts. One of the most common issues that affect the appearance and functionality of 3D prints is the presence of unwanted material residues, such as strings, blobs, and zits.
Fortunately, there is a way to reduce or eliminate these artifacts by using a feature called retraction. But what does retraction mean?
Let’s break it down:
The retraction test is a calibration procedure that aims to reduce or eliminate the stringing and oozing problems that may occur during 3D printing. Stringing and oozing are caused by the excess material that leaks out of the nozzle when the hotend moves from one part of the model to another without extruding. This results in unwanted strands or blobs of filament on the surface or between the parts of the model, affecting the quality and appearance of the print.
