Latest Release: Beta —

Runebrace is Free — Support the Project

Runebrace is free to use, even professionally. It's developed and maintained by a single person. If you'd like to support the work, any contribution helps fund new features.

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Choose your platform. Each build is a self-contained archive — extract and run, no installation required.

Changelog

1.4.9b 8 August 2026 Latest
  • Auto Bracing can now build a short, direct support that runs straight from the model surface to a nearby support, in a single segment. Hold Alt while pressing F1: if a valid trunk sits close by along the surface normal, the preview shows the short link instead of the usual three point branch. It keeps crowded areas much cleaner, and in those spots it saves the work of placing these supports by hand.
1.4.8b 8 August 2026
  • Branches can now attach to supports of the same diameter, not just to thicker trunks. This widens the range of valid attachment points for both automatic and manual branching, and the branch is slightly tapered where it meets the trunk for a clean, solid junction.
  • When the Networked raft is selected, a freshly loaded model now shows its footprint on the plate as a Basic raft, so you can judge the space it takes before placing anything. As soon as the first support goes down, the preview gives way to the Networked raft.
  • Supports that leave the print volume are now highlighted in red, including the individual portions that stick out, so you can spot and fix them at a glance.
1.4.5b 12 July 2026
  • New About panel, reachable from the toolbar. It shows the current version and build, a Thanks section listing the people who support the project, a Ko-fi and PayPal button to support development, and a link to the website. When a newer version is available the panel tells you, and the About button in the toolbar turns orange as a heads up.
  • Dragging the aligned parts of a support is now more precise and stays consistent with the red section overlay, so the part you move follows the highlighted support section shown by the shader instead of drifting from it.
1.4.4b 3 July 2026
  • The Networked raft has been rebuilt from scratch. Its base is now computed as an exact merge of the support footprints and the bridges between them, so it exports as valid, printable geometry at any bridge length, thickness or spacing. Parameter combinations that used to produce a broken raft rejected by 3D Builder now come out clean.
  • Reloading a saved project now keeps the hollow cavity exactly as you generated it. Before, reopening a hollowed model could smooth the inside again and close thin drainage channels in slim areas like arms, trapping resin without any warning. The hollow now stays identical and drainable after save and reload.
1.4.2b 27 June 2026
  • Ground supports now space their feet automatically, so columns no longer fall too close together and diagonal bracing forms cleanly without manual adjustments. The new spacing is shown live in the preview while you place them.
  • Improved raft generation for both Standard and Networked types, with cleaner geometry and reliable export. Isolated parts of a model now get their own complete raft base.
  • Hollowed models with drainage holes are now cleaned up automatically right after the operation, so they come out ready for slicing and validation.
  • The Auto button for voxel size now keeps the value within a safe range for a clean shell, and warns you when it is too high.
  • The overhang highlight now follows the angle you set, across every view mode, with a slider to adjust it.
  • You can now save the current parameters as your default settings. The keyboard shortcuts were reworked for more reliable rebinding.
1.3.92b 15 June 2026
  • The "Supports on Rim" tool now has a boundary mode dropdown: Outer Rim only (default) traces just the outer perimeter, while All boundaries also includes any inner holes in the selection.
  • New keyboard shortcuts while in triangle brush mode: Q toggles select mode, A grows the selection, S drops supports on the rim, and D clears the selection. Outside brush mode these keys keep their usual behavior (S stays the smoothing brush, D deselects supports).
  • Support spacing now matches the real distance between supports, so x1 packs them tightly and higher values space them out predictably. Thin vertical columns no longer spread out too far.
  • Grow Selection no longer climbs onto upward-facing surfaces that don't need supporting. The "Max from down" slider sets how far from straight-down it is allowed to reach.
  • The "Save Project" button now turns red whenever the scene has unsaved changes, not just before the first save. It returns to normal once you save. Rotating the camera doesn't count as a change.
1.3.9b 14 June 2026
  • New "Supports on Rim" and "Supports on Area" tools place supports directly from a triangle selection. Paint a region with the triangle brush, then Rim traces every boundary of the selection (outer perimeter and inner holes), while Area fills the interior. Used together they give outline plus fill with no overlapping supports.
  • Holding F4 (Place Vertical Support) while clicking Rim or Area now generates straight 2-point vertical columns instead of the standard path. Release F4 for normal supports.
  • The angle-based Grow Selection no longer expands onto upward-facing faces, since those are self-supporting and don't need supports. A new "Max from down" slider sets how far from straight-down the growth is allowed to reach.
  • A new "Inset Radius x" slider pulls rim supports inward from the selection border, computed per-edge so the points follow the outline instead of bunching toward the center.
  • Support spacing now measures against the real footprint of the support: the base diameter for standard supports, the column end diameter for F4 vertical columns. Thin columns now pack at the density you'd expect instead of spreading out too far.
1.3.86b 10 June 2026
  • New Batch Mesh Repair: repair an entire folder of meshes in one pass using a saved Mesh Repair preset. Supports STL, OBJ and 3MF, with an optional recursive folder scan.
  • Each result is saved as name_repaired.ext next to the original. Source files are never overwritten, and files already ending in _repaired are skipped automatically.
  • Runs in the background with live progress, per-file status and a full batch log (OK / failed / total). Cancel anytime with the Stop button.
  • How to use: open Mesh Repair, Batch Repair, pick a preset, optionally toggle "Include subfolders", then click "Select File and Start Batch" and pick any mesh inside the target folder.