Split3r vs splicestl: paid desktop vs free browser splitter

By Ned Walsch · Published May 11, 2026 · Updated October 13, 2026 · 7 min read

Split3r is the newest entrant in the dedicated STL-splitter space, and it's a serious one. Released by France-based Qualup SAS in late 2025 after a Kickstarter campaign that drew 2,459 backers and over €111,000, Split3r is purpose-built for the same task as splicestl: cutting oversized 3D models into printable pieces with joinery. The two tools sit next to each other in the market — Split3r is paid desktop software for Windows, macOS and Linux with a strong feature set; splicestl is a free browser tool.

This article covers what Split3r is, what it costs, what it does well, and when each tool is the better fit for your workflow.

What Split3r is

Split3r is developed by Philippe Boichut, founder of Qualup SAS — a French company that's been making industrial FFF 3D printers since 2011 (including the SpiderBot, the first delta-style 3D printer with a heated chamber). Qualup has serious technical credibility in the additive manufacturing space, and Split3r is their consumer-facing software product.

The Kickstarter launched in September 2025 and was fully funded within days; it closed with 2,459 backers and more than €111,000 pledged, with a public beta planned for October 2025. The current release is version 1.5.0, which added coloured-3MF import and export after Qualup replaced the Blender-based geometry engine with its own (reported as seven to eight times faster, and no longer requiring a watertight mesh).

Distribution is direct via Qualup's shop at shop.qualup.com, with electronic delivery after payment. The software runs on Windows, macOS and Linux.

Split3r pricing

Per Qualup's product page and store, checked 13 October 2026:

Licenses are perpetual, one-time purchases with no subscription; the product page says purchases include updates for a year after the 1.5.0 release. Fabbaloo reported two activations per license, and the product page says you can install on several computers with one active at a time. VAT is added in France and the EU.

That puts Split3r Full at roughly an eighth of LuBan's permanent license (€95 against USD 750). It is accessible pricing for what the software does.

Split3r features

For the splitting task specifically, Split3r has one of the most complete feature sets in this category. Highlights from the product page and coverage of the 1.5.0 release:

• Standard and custom tenon joints — splicestl offers a tenon/mortise mode too, alongside pegs, dovetails, finger joints, magnet pockets and dowel holes.
• Part labels and assembly images — comparable to splicestl's cell-ID engraving and HTML assembly diagram.
• Analyze, repair and scale for holes and non-manifold geometry, and a new engine that does not require a watertight input. splicestl also repairs (vertex weld, duplicate and degenerate removal, hole close, winding fix); Split3r's pipeline is more thorough on heavily corrupted meshes.
• Real-time 3D preview of the cutting plan with live parameter feedback — splicestl shows the same.
• Exploded view to inspect every piece before exporting — splicestl also has this, with an adjustable slider.
• Coloured 3MF import and export (version 1.5.0) — painted models from Bambu Studio keep their colours per fragment, and cut faces take the part's dominant colour. splicestl also reads coloured 3MF and emits coloured 3MF per piece.
• Native .s3r project format that saves all parameters and geometry — useful for revisiting and tweaking a split later.
• Desktop memory headroom for very large models — a browser tab has a memory ceiling that a desktop app does not.
• Slicer compatibility with PrusaSlicer, Cura, OrcaSlicer, Bambu Studio.

That is a substantial feature set. At launch in late 2025 Split3r was ahead of the free options on repair and colour. Through 2026 splicestl closed most of that gap; what remains in Split3r's favour is heavier repair, very-large-file headroom, the add-on tools (batch slicing, spline cuts) and paid support.

What splicestl does differently

splicestl's positioning is narrower and the trade-offs are deliberate. The tool does one thing — cut an STL, 3MF or OBJ into pieces with auto-generated joinery (seven modes: pegs, dovetail, tenon, finger, magnet, dowel, screw, none) and an assembly diagram — and does it free in any browser. The 2026 releases added wave, zigzag, sawtooth, brick and pyramid cut surfaces alongside flat; draggable cut planes; 152 printer presets; typed cut positions; piece-count target mode; and a print-farm mode that spreads pieces across several printers with auto-balanced allocation.

Key differences in favor of splicestl:

• No cost. Free forever, no license tiers, no activations to manage, no future price changes.
• No install. Open splicestl.com, drop the file, click download. No Windows requirement, no PayPal, no email confirmation, no activation key.
• Browser-based. Nothing to install; works on a Chromebook or a locked-down work machine as well as on Windows, Mac and Linux.
• Wave, zigzag, sawtooth, brick and pyramid cut surfaces — interlocking cut profiles that resist shear on the cut plane without any insert. Split3r's cuts are flat (its add-on adds cut-by-spline, not interlocking profiles).
• Seven joinery modes — press-fit square pegs, dovetails, tenon/mortise, finger joints, magnet pockets, dowel holes, screw joints, none — against Split3r's standard and custom tenons.
• Print-farm mode — pieces allocated across several printers by throughput, with per-printer filament price and cost / time estimates.
• HTML assembly diagram included in every output zip. Useful for assembling complex multi-piece prints later.
• Cell-ID engraving on the largest face of each piece — find the right piece in seconds during physical assembly.
• Sharable by URL. Tell a friend "splicestl.com" and they're using the same tool you are. Split3r requires a download, install, and a purchase.

Where Split3r wins:

• Heavier mesh repair. Both tools repair common defects (vertex weld, degenerate-triangle removal, small-hole close, winding fix); Split3r's pipeline is more thorough on badly corrupted meshes (large holes, self-intersections), and its 1.5.0 engine does not need a watertight input at all.
• Project save format. Split3r's .s3r files let you re-open and tweak a split later. splicestl saves project settings to a JSON file (including manual cut positions and printer preset) but doesn't bundle the mesh itself, so you reload the source STL after Load.
• Very large STLs. A browser tab has a memory ceiling; a desktop app has the machine's RAM. For files in the hundreds of megabytes, Split3r is more comfortable.
• Paid support and a roadmap. Split3r shipped its public beta in October 2025 and 1.5.0 in 2026, with paid support and a native .s3r project format. splicestl launched in 2026 and is maintained by a small team.
• Add-on tools. Batch quotation and slicing, cut by spline, Simplify (triangle reduction) and Smart Selection have no equivalent in splicestl.

The gap closed substantially in 2026. splicestl now matches Split3r on coloured-3MF splitting, draggable cut planes, "N pieces per axis" mode, printer presets (152 built in, plus custom), mesh repair, AutoShell hollowing and scaling — and goes beyond on joinery (seven modes against Split3r's tenons), on cut surfaces (five interlocking shapes against flat), and with the print-farm mode. The remaining differences are heavier repair, Split3r's add-on tools, paid support, and the desktop app's RAM headroom for very large meshes.

Head-to-head

When Split3r is the right choice

• You do this work regularly and €60–95 one-time is a worthwhile investment.
• You need 3MF / color support for multi-color prints with painted regions.
• Your input STLs are sometimes broken and you want a repair pipeline integrated with the splitter.
• You work with very large models (250+ MB) where desktop memory is more comfortable than browser memory.
• You want custom tenon shapes, spline cuts or batch slicing — the add-on tools.
• You prefer a desktop workflow with a project file you can reopen.
• You want to support Qualup — they're a long-standing player in the industry, and your purchase funds continued development.

When splicestl is the right choice

• You want to split an STL right now without payment, install, or download — open a URL and you're using it.
• You don't want to spend €60+ on software for an occasional task.
• You cannot or do not want to install software — a locked-down machine, a Chromebook, a friend's laptop.
• Your STL is reasonably sized (most Printables / MakerWorld / Thingiverse downloads are under 50 MB, which browsers handle fine).
• You want a choice of joinery — pegs, dovetails, finger joints, magnets, dowels — or an interlocking cut surface.
• You want to share the tool with someone — "go to splicestl.com" is easier than "buy Split3r and install it".

The honest assessment

Split3r and splicestl are the two most capable dedicated STL splitters available in 2026. Split3r is the more complete paid product — heavier repair, colour support, large-file handling, add-on tools — at a price that is reasonable for anyone who splits models regularly. splicestl is the free, instant alternative, with more joinery and cut-surface options and a print-farm mode, for the hobbyist case that is most of the market.

If you split models every week and want a desktop app with support, Split3r at €95 one-time is a sound purchase. If you split a model a few times a year, or want to try the workflow without a purchase decision, start with splicestl.

For broader context, see the LuBan3D vs splicestl comparison (LuBan is the older, more expensive commercial alternative), the full splitter comparison (covering Cura, Bambu Studio, PrusaSlicer, Blender), or the complete guide to printing models bigger than your build plate.

What changed — 13 October 2026: corrected the platform claim (Split3r runs on Windows, macOS and Linux, not "Windows only / Linux beta") and the launch history (Kickstarter September 2025 and public beta October 2025 — the text had also said "shipping since 2024, Kickstarter 2023"); removed an unsourced Kickstarter target, USD conversions and a "250+ MB tested" claim; aligned the feature list with Qualup's product page; corrected splicestl's joinery count to seven and cut shapes to six; added the quick answer, sources and four FAQ entries.