Privacy policy
In one paragraph: your 3D files never leave your computer — the tool runs in your browser and there is no upload, account or sign-up. The site uses Google Analytics for visit statistics, which sets cookies you can block without affecting the tool. It shows no display ads; it is funded by Amazon affiliate links. Your settings are kept in your own browser's local storage. Contact: nedwalsch@gmail.com.
What the tool does with your files
Models you open (STL, 3MF, OBJ, project files, connector STLs) are read by JavaScript running in your browser and are never transmitted to this site or anyone else. Splitting, repair and export all happen on your machine; the zip you download is assembled in your browser. If you open a model through a /?model= link, your browser fetches that file directly from the address in the link; this site does not see it.
What is stored in your browser
Your settings (printer, joinery, output options, custom printers, view preferences), the "what's new" marker and similar conveniences are kept in localStorage on your device so they are there next time. The lithophane studio and the other photo tools remember nothing between visits (each starts from its defaults); the filament painting page keeps only filaments you add yourself. The engraver page talks to your engraver only when you press Connect or Upload — over USB, or directly to its address on your own network after your browser asks you to allow it — and nothing about the job or the machine is sent to splicestl. The repair tool, the puzzle maker, the vase generator and the calculators work on your files and numbers in the browser and keep nothing between visits; to read a 3MF, the repair tool and the calculators fetch a zip library from the cdnjs CDN the first time it is needed. A service worker caches the page and its libraries for offline use. None of this is sent to the site. Clear your browser's site data to remove it.
Analytics
The site uses Google Analytics 4 to count visits and see which pages are read. Google sets cookies and processes your IP address and browser details under Google's privacy policy. The tool also records three anonymous events (model loaded, split finished, zip downloaded) with counts only — never the model, its name or its dimensions. If Microsoft Clarity is enabled it records anonymised page interactions under Microsoft's privacy statement. You can block all of this with a content blocker or by disabling cookies; the tool keeps working.
Advertising and affiliate links
The site shows no display ads (there were Adsterra banners until 6 November 2026; they are switched off). Links to Amazon for lights, glue, filament and hardware are affiliate links (tag nedwalsch-20): if you buy after clicking one, splicestl earns a small commission at no extra cost to you. Clicking takes you to Amazon, which sets its own cookies under Amazon's privacy notice; splicestl records only that an affiliate link was clicked and which one. As an Amazon Associate, splicestl earns from qualifying purchases.
Third-party resources
Fonts load from Google Fonts and the geometry and 3D libraries from jsDelivr and cdnjs; those providers see the request for the file (your IP address and browser details) as any web server does. Nothing about your model is included in those requests.
If you write to nedwalsch@gmail.com, the message and any file you attach are used only to answer you and to fix the problem you report, and are not shared.
Your rights
Because the site holds no account or personal data of its own, there is nothing to export or delete here; for data held by Google, Microsoft or Amazon use the links above. EU/UK visitors: the legal basis for analytics is consent where your browser or a consent prompt asks for it, and legitimate interest in running and funding a free tool otherwise. Questions to the address above.
Changes
Changes to this policy are noted here with the date. 13 October 2026: first version.
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