Edit and create 3D models — no CAD experience needed
Drop in a model, click a hole, type a new size. Before slicing, Solidon3D checks the part for printing risks and hands it to your slicer. No cloud, no account.
Free until 30 October. From 1 November, buy once: private licence from €69, no subscription.
Solidon3D is not a slicer and not a model library. It sits in between: between the file that does not fit and the slicer that prints it without asking.
Version 0.5.3, released on 6 October 2026.
Complete and without a key: no watermarks, no export lock, no feature held back. It runs until 30 October 2026 and will not start after that — your project files are not affected.
Version 1.0 is planned for 1 November 2026 at 10:00 (German time). What it costs is shown below under Price.
The Windows version is digitally signed from 0.5.0 on. The signature identifies the publisher and makes later changes detectable. Microsoft Defender SmartScreen may still show a warning for new files. Before running the installer, check the download source and the publisher shown.
macOS. From version 0.4.1 the packages are notarised with Apple: installation and first launch run without a prompt. If macOS blocks an older version, allow it once under System Settings → Privacy & Security → Open Anyway.
Linux. A Flatpak is not installed by double-clicking but from a terminal: flatpak install ./Solidon3D-*.flatpak in the folder you downloaded to. Solidon3D then appears in your application menu. The AppImage, by contrast, is a single file and needs no installation — only permission to run: chmod +x Solidon3D-*.AppImage, or right-click, Properties, “Allow executing” in your file manager. A double-click opens it after that.
New versions. Solidon checks at startup whether a newer version is out and offers it for download — downloaded and installed only on your confirmation, and it can be switched off in the settings.
After installing: Where do I start? — guides in pictures, from the first click to the print.
Built for everyone who prints, not just for those who know CAD. This is what the path looks like in the demo:
No account, no key, no setup. Four guided tours and twelve example projects are waiting on the start screen.
An STL from Printables or a project of your own. The report shows detected printing risks, and every finding suggests what to do.
Click a hole or face, change the measured number, take the fit from the material profile. Then export, or hand it straight to your slicer with settings that suit the part.
Four things people often say about printing, and what Solidon3D makes of them:
The hole is 0.2 mm too small, and I don't have CAD.
Click the hole, enter the new size. Even in a downloaded STL: holes are recognised as features, and the wall thickness next to them is measured. Solidon3D does not invent lost CAD history.
The print failed at 80 %, because of an island.
Layer analysis shows it beforehand. Overhangs, islands, walls that are too thin and the support volume — before the slicer spends the time.
The lid jams. It fitted on the third try.
Fits from the material profile. A printed calibration ladder lets you adjust the starting values for clearance, press fits and flush fits to your printer and filament.
The part is 40 mm too big for the bed.
Split and pin in one step. Split automatically creates the alignment pins, the holes and the matching fits along with them.
All four end in the same scene, the same history and the same inspection report. You decide per part, not per program.
Way 1 — Edit
Drop the file — or drag the link from MakerWorld, Printables or Thingiverse straight out of the browser into the window, skipping the download folder. Read the inspection report, click a face or a hole — then say in the chat what it should become, or pick the action on the right. Compare before/after, apply, export.
Features in downloaded modelsSpool holder, built in 20 steps — drag it or use the arrow keys to turn it
Describe what you need. The agent creates parameters and places proven building blocks — threads, heat-set inserts, hinges. Turn the numbers, the model follows instantly. Try the slider: each of the 24 pictures was computed on its own, not stretched.
Tested building blocks
Drop in a file from any generator you choose: Solidon3D repairs the mesh, sizes it, checks it against printer and material, and splits or pins it when needed. On request, Solidon3D also sets up a model of its own, TripoSG for the shape and SDXL for the image behind it, and downloads nothing without asking. The complete licence and provenance chain of the weights is still under review.
From generator to printable partSome shapes cannot be dimensioned. Rough out the base from primitives, blend them smoothly, even out the mesh, then sculpt it with six brushes. The whole session stays one step in the history and remains editable. While you sculpt, wall thickness runs along: spots that are too thin appear as a number in the bar, not in the slicer.
Sculpting by handFour parts, built and checked in Solidon3D. Each carries a feature no box editor gives you: a thread that grips, a hinge in one piece, a hook that actually hooks. Every one of them was built through the same menus you use — step by step, and every step can be taken back.
The essentials at a glance. Every tool, with pictures and examples, is on the features page.
One sentence in the chat becomes a proposal that a single undo takes back completely. Geometry is computed by code, never by the language model, and that is measured: a suite of 39 reference requests runs before and after every change to the agent’s rule set.
Click a recognised hole to move, turn, duplicate or resize it. If it has a countersink at the top or a step below, you decide what goes along. Every fit that points at it keeps its reference.
Divide compartments in the preview, specify outer dimensions or clear compartment sizes and change divider heights individually. Project parameters keep related dimensions equal. Tray, rim, divider and plug-in foot are also available as building blocks.
Distribute round holes, slots or honeycomb cells within a drawn area. Border width, spacing and excluded zones define the field; its dimensions remain editable later.
The filament inventory keeps every spool with material, colour, storage location and remaining amount — across projects. After the slicer handover, Solidon3D offers to book the consumption, estimated or planned from the G-code; the history shows every booking and takes it back on request.
A built-in MCP server lets a second program call the same operations as the menus. It is off by default and reachable only on your own machine. Every remote call that changes something is a step in the history that one undo takes back.
Also included: constrained sketches, where a circle on an exact body stays a cylinder and never becomes a polygon, reliefs from images, spatial lattices, draft angles, matching lids and multicolour labels.
See all featuresBetter said up front.
Until 30 October the demo is free and complete. Solidon3D 1.0 is planned for 1 November 2026, with sales opening at 10:00 German time: pay once, no subscription, all updates of version 1.x included.
Free until 30 Oct 2026
Version 1.0 will open your projects afterwards.
€69 Introductory price until 31 Jan 2027
From 1 February 2027: €99
€199 Introductory price until 31 Jan 2027
From 1 February 2027: €249
Both licences are one-time purchases at the final price. Commercial use means any use for a business or self-employed activity; training, study and teaching do not count. Security updates are promised for both until at least 31 October 2031, and you can report vulnerabilities privately through the security contact, for the demo too. The terms of sale, the licence agreement and the cancellation policy apply (in German).
The demo costs nothing, and supporting it changes nothing about that. A lot is still planned before version 1.0. If you would like to help carry that work, you can do so here, voluntarily.
Done
Planned
Planned does not mean promised: every version comes out only once it has been tested.
I am Robert Schneider from the Bamberg area in Germany, a trained electronics technician and a software developer since 2025. Before that, I programmed as a hobby. I build Solidon3D on my own, under my company RS Digital: the program, the manual, this website and the support. If you write to me, the reply comes from me.
I program with AI tools. I decide what Solidon3D should do and what a result is measured against. The geometry is computed with manifold3d and OpenCASCADE, the geometry kernel FreeCAD also uses. Before every release, more than 20,000 automated tests run on Windows, macOS and Linux, checking dimensions against calculated target values. I print myself on an Elegoo Centauri Carbon 2 and try new features on real models from the internet.
Already paid for myself: the Apple Developer Program, without which the Mac packages would not open with a double-click, and the Windows code-signing certificate from Certum.
Two ways with the same purpose. Neither provider opens until you choose in the next step.
An amount of your choice, with a PayPal account or a card. PayPal handles the payment on its own page.
The campaign for Solidon3D up to version 1.0. You can load its current status from GoFundMe right below.
This is not an order, provides nothing in return and is not credited toward a later purchase. I do not issue a tax certificate for the payment; do not treat it as tax-deductible. PayPal or GoFundMe opens only after you choose it in the local notice; privacy details.
Campaign status. Only this button loads the GoFundMe display. Data such as your IP address then goes to GoFundMe, and the display may set cookies and load services such as Google and Meta. More in the privacy policy (in German).
| Operating system | Windows 10 (1809 or later)/11 (x64), macOS 13 or later, or Linux (x64, X11/Xwayland) — on the Mac as separate builds for Apple Silicon and Intel, notarised with Apple from version 0.4.1. Windows 11 with Smart App Control switched on starts only signed applications or those Microsoft rates as safe. The Windows application and installer are digitally signed from version 0.5.0. |
| Disk space | about 750 MB installed, download between 169 and 254 MB depending on your system |
| Basic use | 8 GB of RAM and graphics supporting Direct3D 12, Vulkan or Metal — the AI rows below are extras, not minimum requirements |
| Display | At least 1920 × 1080 pixels (16:9, Full HD) or 1920 × 1200 pixels (16:10). Recommended: 2560 × 1440 pixels (16:9, QHD) or 2560 × 1600 pixels (16:10). |
| Chat (optional) | your own API key (ongoing cost at the provider) or Ollama with one of the recommended models — from a graphics card with 8 GB of memory (full speed from 10 GB), 16 GB for the larger ones |
| Generated model (optional) | an external GLB or STL file, or Solidon3D sets up TripoSG and the SDXL image model on request |
| Other (optional) | a slicer — it is found or configured, and it is not required |
One person: Robert Schneider, RS Digital, Bamberg. Design, program, manual, website and support come from one hand — the reply to your feedback is written by the person who wrote the code.
The fairer question is what happens if that person stops. That is why Solidon3D is built so it does not hold on to you: it runs without an account and without a network, your projects are files on your own machine, and a project file is a ZIP archive with JSON inside — readable without the program. Exports go to formats every slicer and every CAD knows: STL, 3MF, STEP, OBJ.
From 31 October the demo will no longer start. It says so beforehand: the status bar shows every day how much time is left.
31 October is reserved for the final checks. Solidon3D 1.0 is planned for 1 November 2026 at 10:00 German time; from then on the private and the commercial licence are on sale.
Your files are not affected. They stay where you saved them; nothing is deleted and nothing becomes unreadable. A project file is a ZIP archive with JSON inside and opens without Solidon3D — the next version reads it unchanged.
Because that lets it be complete. A version that turns into a viewer after fourteen days shows less on your second project than on your first. This one shows everything until the last day — and then ends, rather than living on as half a program that nobody maintains.
Yes. Build the part once, create parameters for its dimensions and choose Save selection as a part in the catalogue. Creating it checks the block at specified combinations within its range; afterwards it sits next to the supplied ones with a preview image and fields.
It stays on your computer — and travels as a recipe inside every project file that uses it: a list of steps and values, not a program. Whoever receives the file can compute with it without installing anything.
No. Way 1 gets by with clicking and one sentence in the chat, way 2 with describing and turning numbers. And the drawing itself is built for beginners: every tool says what the next click does, and every constraint explains in one sentence what it holds.
Yes. Holes, pegs, countersinks, domes and sockets are recognised as named features when the file opens; a click shows their measured values as dimensions in the view and in the Selection panel on the right, and changing a number is the operation. Moving, duplicating and removing apply to each of these kinds, turning to all but the spherical face. Fillets and coves that recognisably replace an edge can have their radius changed or be removed; a transition that flows smoothly into its neighbouring faces cannot. Solidon3D shows which actions are available at the selected location.
No. The chat is one way out of four. Without a key and without Ollama, everything except the chat stays fully usable — menus, the Selection panel, command line and all 178 operations.
No, and that is the most important sentence on this page. The language model picks operations and parameters — every piece of geometry is computed by code. Each proposal from the agent is exactly one transaction, and a single undo takes it back completely.
Yes. Solidon3D has a built-in MCP server: a program like Claude Code uses it to call the same operations that sit in the menus. It is off by default, accepts connections only from your own machine (127.0.0.1), takes neither file paths nor source code from outside — and every remote call is a transaction in the history that a single undo takes back completely.
Your project files stay on your computer. In chat, the selected language model receives your message, a digest of the scene and the conversation history. If it supports images, rendered views of the model may also be included.
With Anthropic or a remote Ollama server, this data leaves your computer. Ollama running on your own computer processes it locally. Before the first model request, Solidon3D shows the selected destination.
Network connections are also used for device activation, the optional update check and downloads you start. A support message shows its contents before sending. Solidon3D sends no usage statistics and does not store your projects in a cloud.
It reads STL, 3MF (including assemblies), OBJ and GLB, plus STEP with real faces and edges. It also reads PLY, OFF and glTF — and, as drawings, SVG and DXF, whose outline becomes a solid. It writes STL, 3MF — with colour changes
and plate layout —, OBJ, PLY, GLB and STEP; STEP appears in the
export dialog as soon as a solid can carry it. GLB is the format for
showing: colours and name travel along, and the recipient turns the
part in a browser. A project is a ZIP file with
project.json inside: openable without Solidon3D.
Yes, as separate builds for Apple Silicon and Intel — a package built on arm64 will not start on an Intel Mac. Choose the package for your Mac’s processor type. From version 0.4.1 the packages are notarised with Apple and open on a double-click. An older version reports that macOS cannot verify the file is free of malware and offers “Move to Trash” as the first button: choose “Done” there, then release the package in System Settings under “Privacy & Security” with “Open Anyway”.
A Flatpak is not a double-click installer but a package your package manager takes in. Open a terminal in the folder you downloaded to and enter: flatpak install ./Solidon3D-*.flatpak
Solidon3D then appears in your application menu. You can also start it with flatpak run de.rsdigital.solidon3d and remove it with flatpak uninstall de.rsdigital.solidon3d. If your system does not know the flatpak command, your distribution installs it under exactly that name.
Twenty profiles are included: eighteen filament printers, among them Elegoo, Bambu Lab, Prusa, Creality, Anycubic and Sovol, and two resin printers by build volume. You can add your own — what is needed is the build volume and the layer height, plus the nozzle for a filament printer or pixel size and minimum wall for a resin printer. For the fits, one calibration print comes on top.
Version 1.0, planned for 1 November 2026 at 10:00. It comes in two licence types with the same features, both one-time purchases with all updates of 1.x: private €69 and commercial €199, each an introductory price until 31 January 2027. From 1 February 2027 the private licence costs €99 and the commercial one €249.
Your demo projects remain readable as local files, and version 1.0 opens them.
The demo runs until 30 October — free and complete. Write a line and you'll get an answer: a human answers.
To the demo support@solidon3d.de Read the manual first