Fabbaloo says Cura loses ground as slicer innovation shifts to Slic3r tools

Cura is not going away, but it no longer sits at the center of slicer innovation the way it once did. For desktop FFF users, the practical change is simple: if you want the newest workflow tricks, the broadest feature churn, and the most active cross-pollination between printer brands, the momentum has shifted toward the Slic3r family led by PrusaSlicer, OrcaSlicer, and Bambu Studio.

Cura still earns a place, but the tempo has changed

UltiMaker still presents Cura as free, open source software trusted by millions of users, with 400+ settings to tune a print. That matters because Cura remains a real, maintained tool, not a relic. UltiMaker’s GitHub organization is still actively maintaining Cura and CuraEngine, and release notes show Cura 5.13.0 on May 29, 2026, so the project is very much alive.

What has changed is where the most visible energy sits. A few years ago, the desktop slicer world was easier to map: Cura and PrusaSlicer formed the two major open-source branches, and many manufacturer-branded slicers were basically customized forks. That picture still exists, but the most active feature development now tends to flow through Slic3r-derived tools, especially when the topic is calibration helpers, multicolor workflows, and printer-specific integrations.

What Cura still does well

Cura’s strongest case is stability with depth. Its 400+ settings give experienced users plenty of room to shape a print, and the 5.0 release on May 17, 2022, brought a new slicing engine formerly known as Arachne. UltiMaker said that engine added variable line widths and could improve print speed on UltiMaker printers by up to 20%, which is a meaningful gain when you care about throughput as much as surface finish.

That makes Cura a sensible choice if your workflow is already built around it. If your printer profile is dialed in, your material settings are predictable, and you do not need the newest ecosystem-specific features, staying put can still be the low-friction option. Cura’s value is no longer novelty, but familiarity, breadth, and a mature settings stack that remains useful for everyday slicing.

Why the Slic3r family is pulling ahead

The center of gravity has moved because the Slic3r lineage keeps reinventing itself. Prusa Research says PrusaSlicer is free, open source, and works with any FDM or resin printer, which makes it more than a brand-locked utility. Its current version, 2.9.5, was released on May 19, 2026, and Prusa says its team had 13 full-time developers and 145,720 work hours invested in the software as of January 2024, with only about 10% of the original code remaining.

That is a huge signal for makers who care about pace. Prusa’s own history says Slic3r was born in 2011 in the RepRap community under Alessandro Ranellucci, then later became the foundation for Prusa’s slicer line. In other words, the branch that started as a community project has become a heavily developed platform with enough momentum to keep reinventing itself while still staying open and broadly compatible.

OrcaSlicer shows how far that momentum has spread. Its project pages describe it as an open-source next-generation slicing software, and its lineage traces back through Bambu Studio to PrusaSlicer and ultimately Slic3r. One OrcaSlicer README even highlights restored full BambuNetwork support for Bambu Lab printers, which is a strong reminder that slicer choice is now tied directly to ecosystem compatibility and feature access.

What this means for real printing jobs

If you are chasing better first layers, the decision is no longer just about which interface feels friendlier. Cura’s Arachne engine and variable line widths still offer useful control, especially if you already know how to exploit Cura’s settings depth. But the more active Slic3r orbit is where many users now look for faster tuning loops, more visible calibration work, and the kind of printer-specific profile refinement that shortens the path from rough setup to reliable output.

If you manage more than one machine, the Slic3r side looks increasingly attractive because that ecosystem is where cross-fork inheritance is happening most visibly. PrusaSlicer, OrcaSlicer, and Bambu Studio are all part of a family that keeps passing ideas forward, which is valuable when you want one slicer workflow to cover different printers, different materials, and different levels of automation without rebuilding your habits from scratch.

If you print multicolor or multi-material jobs, the ecosystem story matters even more. The latest visible work in the Slic3r lineage is closely tied to multicolor workflows and printer integrations, while OrcaSlicer’s BambuNetwork support shows how deeply these tools are now aligned with hardware-specific capabilities. That is the real switch: you are not just choosing a slicer, you are choosing how quickly new hardware tricks land in your toolbox.

How to decide whether to stay or migrate

If Cura already handles your prints reliably, there is no reason to chase change for its own sake. Its active development, open-source status, and deep settings library still make it a serious option, especially for users who value consistency over experimentation. The question is whether your workflow would benefit more from a mature, familiar environment or from the faster-moving feature stream now visible in the Slic3r family.

A practical way to judge it is by the job in front of you:

• If you need broad control and already trust your profiles, Cura still has the depth.
• If you want fresher calibration workflows, PrusaSlicer and OrcaSlicer are where the action is.
• If you live inside a specific printer ecosystem, Bambu Studio and OrcaSlicer show how much slicer choice can affect feature access.
• If you want the widest cross-printer flexibility, PrusaSlicer’s open stance and broad printer support make it hard to ignore.

The bigger takeaway is that slicer choice has become part of printer buying strategy. Cura remains important, actively maintained, and widely used, but the most visible innovation, developer mindshare, and ecosystem borrowing are now flowing through the Slic3r branch. For makers, that means the next print is not just about hardware, it is about whether your slicer is still where the best ideas are landing first.