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What changed — 9 November 2026: four new tools — a vase & planter generator, a photo jigsaw puzzle maker, an STL repair & converter and calculators for print cost, Etsy fees, filament and calibration — plus 3D QR codes in the sign maker and every tool on one page. 8 November: the laser & CNC engraver studio — design, G-code and sending to GRBL machines over USB or Wi-Fi in one page. 7 November: three new tools — the sign & keychain maker (multi-colour names and logos on one nozzle), a Gridfinity generator (bins and drawer baseplates) and a cookie cutter maker — and photo ornament outlines in the lithophane studio. 6 November: filament painting (colour prints on one nozzle with filament swaps) and colour lithophanes in the studio (tinted on any printer, full colour on AMS/MMU); two new tools, the shadow sculpture maker (two words in one shadow cube) and the flip sign maker (two pictures on one ridged multi-colour print); the lithophane studio gained layered 3D, animated GIF, hidden-message and projection-lamp shapes; glue recommendations by material in the download step; no more display ads. 5 November: a third tool, splicestl/lithophane: a photo becomes a flat, curved, night-light, cylinder or box lithophane with a base cut for off-the-shelf lights. 31 October 2026: a share card and a copy-ready credit line in the download step, a 3MF splitter page, build-volume pages for the most-searched printers, the tool page in Portuguese, Spanish, French, German and Italian, and the browser-splitter comparison extended to Multipart3D, 3D Splitter, STL-Splitter.com, PrintSplit and Split3MF. 30 October: the tool became four steps (load, printer, connectors, download) with the advanced options under a Pro settings fold in each; the split runs by itself once a printer is chosen; a filament estimate with brand links sits in the download step; and the documentation moved to its own pages — how it works, joinery, cut shapes, comparison and FAQ — linked from the cards below. 13 October: the comparison was re-checked against vendor documentation, the FAQ deduplicated, ads moved below the tool, and the printer build-volume dataset published.
Most people arrive here with one problem: a model that is bigger than their printer. splicestl cuts it into pieces that fit, adds joinery at every cut so the pieces register and hold, and packages the result as a ZIP with an assembly diagram. It also handles the jobs that come up alongside splitting — repairing a non-manifold mesh, hollowing a solid model to save filament, scaling, and spreading pieces across several printers.
Cut large STL files into press-fit pieces with auto-generated joinery. 9 joinery modes, 7 cut shapes, print farm mode with cost & time estimates, 152 printer presets + custom printers, mesh repair, AutoShell hollowing, 3MF multicolor preservation.
→ open splicestl (this page)Silicone shell molds (a printed mother mold that hugs the master, so the silicone mold takes a fraction of the silicone), two-part block molds and open molds from STL, OBJ, 3MF, GLB or PLY. Repairs the mesh on load, maps undercuts and fills them in one click. Same Manifold WebAssembly engine as splicestl. How it compares with Meshcast.
→ open splicestl/moldTurn a photo into a 3D-printable lithophane: flat or curved panel, tea-light night light, 360° cylinder lamp or four-sided box — with the base cut for the light you will buy (LED tea light, USB puck, LED strip, E26/E12 socket, battery pack). Backlit preview, STL/3MF, nothing uploaded.
→ open splicestl/lithophaneTwo words of the same length — two names, LOVE / HOME — become one 3D print whose shadow spells one word from the front and the other from the side. Pictures work too. Floating pieces are found and pinned to the base; the preview casts real shadows on two walls.
→ open splicestl/shadowTwo words or two pictures on one ridged sign: one from the left, the other from the right. Made for multi-colour printers (Bambu AMS, Prusa MMU) — a 3MF with one part per filament, plus a stand.
→ open splicestl/flip-signA photo becomes a colour relief printed on any single-nozzle printer by swapping filament at the right layers (the HueForge technique). Tick the filaments you own; it picks the best few, the order and the swap layers, shows the simulated result, and exports a 3MF with the colour changes built in.
→ open splicestl/filament-paintingNames, words, a logo (PNG or SVG) or a scannable QR code (link, Wi-Fi, phone, email) as a multi-colour keychain, wall sign, desk sign or fridge magnet on any printer: each colour is a layer step, and the 3MF already has the colour changes. One part per colour for AMS / MMU too.
→ open splicestl/sign-makerGridfinity bins of any size — standard, lite, bit and battery holders, card slots — with compartments per row, labelled tabs (even in a second colour) and magnets; baseplates sized to your drawer and split to your bed; and a planner that lays out the whole drawer and exports every bin.
→ open splicestl/gridfinityTwelve holiday shapes, letters, or your own silhouette as a cookie cutter with a sharp edge and a flange, plus a matching stamp — mirrored for printing so the cookie reads right.
→ open splicestl/cookie-cutterFor diode lasers and hobby CNC routers on GRBL: photos, text, logos, cut-outs, a power × speed test grid, reliefs and CNC lithophanes become G-code — then run them from the page over USB or Wi-Fi (FluidNC, ESP32 web UIs) with live status, jog, frame and stop.
→ open splicestl/engraverEight profiles, round, polygon, star or petal sections, twist, ribs, waves and diamonds — exported as a solid for spiral vase mode, or with real walls, a drain hole and a saucer. Shows how much it holds and the filament it takes.
→ open splicestl/vaseA photo becomes a jigsaw puzzle that comes off the bed already in pieces: in colour (filament changes or AMS), as a lithophane you hold to the light, or plain with a 300 dpi sticker sheet. 6–150 pieces, an optional tray.
→ open splicestl/puzzleDrop a broken STL, OBJ, 3MF, PLY or GLB: holes are patched (shown in green), flipped and duplicate faces fixed, overlapping parts merged, and anything beyond that rebuilt as a solid. Simplify, fix the units, and save as STL, OBJ, 3MF, PLY or GLB.
→ open splicestl/repairWhat a print costs and what to sell it for (drop an STL for the filament), what Etsy leaves you after fees, filament left on a spool, shrinkage and scale, flow, e-steps and volumetric flow — updating as you type.
→ open the calculatorsSee every tool on one page, grouped by what you start with →
Load the STL into the tool at the top of this page, pick your printer (or set the maximum size each piece may have — usually the build volume minus a few millimetres of margin), and download the ZIP. You get one STL per piece, with connectors already in place, ready to slice.
An STL splitter cuts a 3D model file (STL, 3MF or OBJ) into smaller pieces that each fit on a printer's build plate, usually adding connectors — pegs, dovetails, magnets — so the pieces go back together after printing. Typical uses: printing a model that is too big for the printer, splitting a multicolor 3MF with its colors intact, printing pieces in parallel on several printers, and breaking a model up for shipping.
Drop the file into splicestl, set the piece size, and pick a connector in the joinery panel: square pegs (press-fit, default), dovetails (slide-together, single-axis splits), tenon/mortise, finger joints, magnet pockets or dowel holes. Connectors are placed on every cut face automatically, with adjustable size, count and tolerance. Download the ZIP and print.
For one straight cut, the Cut tool already in Bambu Studio, OrcaSlicer or PrusaSlicer is free and needs no extra software; all three add Plug/Dowel/Snap connectors or a dovetail. For a model that needs cuts on more than one axis, automatic fitting to your build volume, finger/magnet/tenon joinery, interlocking cut surfaces or a print-farm split, splicestl is free and runs in the browser. Paid desktop splitters are Split3r (€60–95 one-time) and LuBan3D ($30/month to $750 permanent); see the hands-on comparison.
Yes. Choose a printer preset (152 printers) or type the largest size a piece may be on X, Y and Z, and splicestl plans the cuts on all three axes and splits the model by itself — no planes to place. The cut handles stay draggable if you want to move a seam, and Pro settings add seam-aware placement, manual cuts and seven cut-surface shapes.
Yes. splicestl reads 3MF (and OBJ) as well as STL, keeps per-triangle color on painted or multi-material 3MF files, and can write the pieces back as 3MF — one file per piece, one file per build plate, or a single Bambu Studio / OrcaSlicer project with every plate laid out. See the 3MF splitter page.