Changelog

Connectors now sit on the faces that actually meet the other piece. A curved panel counts as one surface. A face with nothing against it is no longer offered as a placement surface.

• Cut tools have new icons, and the cut and connector panels were reworked.
• Smart Detach help text matches the tool. Click a feature, or paint it with the brush. Shift-click adds or removes a smart region. Shift-drag erases a brush stroke. Ctrl+Z undoes the last click or stroke.
• Feature screenshots were replaced with smaller images.

Fixes

• Painted 3MF colors survive export. The download stays in the format you opened, and a 3MF keeps the filament colors on the triangles. STL has no color channel, so the paint only comes through when the file is saved as 3MF.
• A repeated part name in a ZIP gets a trailing number, so one part does not replace another. The download uses the name shown in the parts list.

Area Cut and Smart Detach were rebuilt for noisy, one-piece meshes, the kind that come out of an image-to-3D tool. The work landed in two steps. The version label moved to 1.5 when the second step shipped.

Selection and Area Cut, 20 October

• Shift-click subtracts a region that is already selected. Ctrl+Z or Command-Z during selection undoes the last click only. Committed cuts stay put.
• Area Cut is aimed with the mouse. Drag a rectangle or circle in the plane, pull a depth handle, and see the cutter while you drag. The cut runs once, when you release.
• The default depth is short, so geometry behind the piece you are taking stays whole. Cutting all the way through is an explicit choice.
• Messy selections lose spurs and pinholes, and a jagged outline is simplified before the seam is closed. A clean loop is left alone.
• Area Cut and Smart Detach run off the main thread, so a large STL does not freeze the page. After Place cut, Area Cut stays armed on the rest of the model and keeps the plane you aimed.

Brush, Organic, and beds, 2 to 5 November

• Brush paints the faces to peel off. Snap to crease grows the stroke out to the first valley. Shift-drag erases.
• Organic is off unless you turn it on. The flood uses a smoothed angle, so a bumpy surface does not stop at every wrinkle or leak through a one-triangle gap. A clean part still uses the original flood.
• Connectors can sit on a curved seam, not only on a flat cut face.
• Brush painting was rebuilt so it stays usable on large meshes.
• New printer beds: Bambu Lab H3C, Prusa MK4S and Core One L, Creality K2, K2 Pro, and K2 Plus, Anycubic Kobra S1 and Kobra S1 Max, Elegoo Centauri Carbon, Flashforge Adventurer 5M and AD5X, QIDI Q2 and Plus 5.
• Mobile layout and logo fixes.

• Brighter body text and a restyled features overview.
• Support is a MakerWorld like.

• Connectors keep a margin from the edge of the cut face and snap back onto a valid spot.
• Parts can be auto-arranged on the build plate.
• Clearer connector size controls, for diameter and thickness, and a clearer cut preview.
• A short explanation of the tool on the homepage, for people arriving from search.

• Public pages in the same deploy as the tool: About, Features, a page per feature, FAQ, Privacy, and Terms.
• Opening those pages leaves a model you already have open untouched.
• Homepage rebuilt around the drop zone and a demo video, with feature cards below.
• MakerWorld support card.
• Logo redrawn so it stays sharp on Retina displays and in Safari.

The idea started in January 2026. The months after that were spent working out what the tool should be: a split you can do in the browser, parts that fit a printer, and connectors so the pieces go back together. That work became the first release.

28 June. First release, v0.75. Browser cutter for STL: planar cut, area cut, dovetail, smart detach, and connectors. No install and no signup.

7 to 8 July. 3MF in and out. Load .3mf beside STL, including Bambu Studio, OrcaSlicer, and PrusaSlicer project files. Download a part or a zip as STL or 3MF. Cut tools moved to the top bar: Planar Cut, Area Cut, Dovetail Joint, and Smart Detach.

14 July. 3MF splitting. Painted models can be split, not only imported. The viewer shows your printer bed, including a corrected Creality CR-10 SE volume. Smart Detach and Separate by Color stay open after a cut.

19 to 20 July. Separate by Color. Painted 3MF regions can be peeled off on their own. This is still marked Beta. Alignment can fall back to a pocket, and connector zones keep their own color.

Site

• 2 to 9 October. The homepage is real HTML before the editor loads. Unknown URLs return a 404. Added a how-to on splitting an STL for 3D printing.
• 2 September. Info pages gained a mobile nav and a support page. Open tool returns to a fresh homepage, and a thanks note explains the download.
• 3 September to 3 November. A splitter comparison article was published, then removed. It is no longer on the site.