Split3r vs splicestl: paid desktop vs free browser splitter

By the splicestl team · Published May 11, 2026 · Updated June 18, 2026

Published 2026-05-11 · Updated 2026-06-18 · 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 successful Kickstarter campaign that raised €111,000 from 2,459 backers, Split3r is purpose-built for the same task as splicestl: cutting oversized 3D models into printable pieces with proper joinery. The two tools occupy adjacent positions in the market — Split3r is paid Windows desktop software with a strong feature set, splicestl is a free web tool with a simpler scope.

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 with a funding target of €16,900. It closed roughly 6× over-funded, which is unusual for B2B-flavored 3D printing tools — strong signal that the community has been waiting for exactly this kind of product. The current stable release is version 1.5.0, which added 3MF and color support after the team replaced the underlying geometry engine (originally Blender's, now Qualup's own implementation).

Distribution is direct via Qualup's shop at shop.qualup.com. Payment is PayPal or credit card; you receive a download link immediately after purchase. The software runs on Windows 10/11 (Linux is in beta).

Split3r pricing

Per Qualup's official store (current pricing):

All tiers include one year of free updates after purchase. The pricing model is one-time perpetual license — explicitly no subscription. Two activations per license, so you can run Split3r on a primary desktop and a laptop. Replacing a lost activation requires contacting Qualup support.

That puts Split3r at roughly 10× cheaper than LuBan's permanent license (€95 vs $750). It's genuinely accessible pricing for what the software does.

Split3r features

For the splitting task specifically, Split3r has the most complete feature set of any tool in this category. Highlights from their product page and recent coverage:

• Tenon-and-mortise joints with configurable tolerances — also offered by splicestl alongside pegs and dovetails.
• Numbered parts embedded in the geometry — similar to splicestl's cell-ID engraving, but using engraved part numbers.
• Repair function for holes and non-manifold geometry. splicestl also repairs (vertex weld, 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.
• Cut-optimised geometries that reduce support material requirements.
• 3MF support with color (added in version 1.5.0) — handles multi-color models from Bambu and other slicers' painted output. splicestl now also reads colored 3MF input and emits colored 3MF output per piece.
• Native .s3r project format that saves all parameters and geometry — useful for revisiting and tweaking a split later.
• Tested with 250+ MB STLs per Qualup's documentation. Desktop memory headroom means Split3r handles very large models that browser tools have to load incrementally.
• Slicer compatibility with PrusaSlicer, Cura, OrcaSlicer, Bambu Studio.

That's a substantial feature set. In 2024 and 2025 Split3r was meaningfully ahead of free options on repair, color, and joint variety. Through 2026 splicestl closed most of those gaps — what remains is desktop polish and the comfort of paid support and very-large-file headroom.

What splicestl does differently

splicestl's positioning is narrower and the trade-offs are deliberate. The tool does one thing — cut an STL or 3MF into pieces with auto-generated joinery (seven joint types: pegs, dovetail, tenon, finger, magnet, dowel, none) and an assembly diagram — and does it free in any browser. The 2026 release added wave, zigzag, sawtooth, brick, and 2D pyramid cut surfaces alongside flat; draggable cut planes; printer presets; manual cut positions; piece-count target mode; and a print farm mode that spreads pieces across multiple printers with auto-balanced allocation, closing most of the feature gap with desktop competitors.

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. Works on Mac, Linux, Chromebook, any OS with a modern browser. Split3r is Windows 10/11 only (Linux in beta).
• Wave, zigzag, sawtooth, and brick cut surfaces — interlocking cut profiles that resist shear on the cut plane without needing pegs at all. Split3r ships flat-only.
• Both peg and dovetail joinery. Pegs for press-fit, dovetails (slide-together) for thin-walled pieces where pegs would split the wall.
• 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:

• Advanced mesh repair. Both tools now repair common defects (vertex weld, degenerate triangle removal, small hole close, winding fix); splicestl's pass handles ~80% of real-world failures, but Split3r's repair is more thorough on heavily corrupted meshes (large holes, self-intersections, multiple shells).
• 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. Browser-based tools have memory ceilings imposed by the browser. Desktop apps with the OS's full RAM access handle huge models more reliably. If you regularly work with 250+ MB STLs, Split3r is more comfortable.
• Mature ecosystem. Split3r has been shipping since 2024 (Kickstarter-funded 2023), with paid support, a feature roadmap, and a stable .s3r project format. splicestl launched in 2026 and is younger.

The gap closed substantially in 2026 — splicestl now matches Split3r on cut surface variety (wave / zigzag / sawtooth / brick alongside flat), 3MF input with multicolor preservation, draggable cut planes, "N pieces per axis" target mode, printer presets (152 built-in plus user-saved custom printers), mesh repair, AutoShell hollowing, and scale-to-target — and goes beyond on joinery variety, offering seven joint types (pegs, dovetail, tenon/mortise, finger/spline, magnet pockets, dowel holes, and a no-joinery option) where Split3r ships one (tenon/mortise with variants), plus an optional print farm mode with per-printer build volume, throughput, allocation %, and filament price for multi-material setups. The remaining differences are advanced repair (large holes, self-intersections), paid-product 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 tenon/mortise joinery or other geometric variants beyond simple pegs.
• You're on Windows and a desktop workflow.
• 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're on Mac or Linux (Split3r is Windows-primary).
• Your STL is reasonably sized (most Printables / MakerWorld / Thingiverse downloads are under 50 MB, which browsers handle fine).
• Square peg joinery is enough for your assembly needs — which it is for the vast majority of multi-piece prints.
• 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 best-positioned dedicated STL splitters available in 2026. Split3r is the more feature-complete option for the paid-software market — repair, color support, multiple joint types, large-file handling — at pricing that's genuinely reasonable for users who split STLs regularly. splicestl is the free, instant alternative for the simpler-and-smaller case, which covers most hobbyist use.

If you're going to be splitting models every week and you're on Windows, Split3r at €95 lifetime is a solid investment. If you're going to split a model once or twice a year, or you're on Mac/Linux, or you just want to try the workflow without a purchase decision, splicestl is the right starting point.

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.