Making, converting and downloading on 3d-lithophane.com is for members. Registering is free and takes a minute: then you can use every tool, with free downloads every day.
Just looking? The gallery, the blog and the guides are open to everyone. Back to the home page.
Load an STL and find out whether it will print: whether it is watertight, where walls are too thin for your nozzle, which overhangs need support, and how much support it would take. It can try a few hundred ways up and suggest the three best orientations.
If the model is broken, the quick fix repairs flipped and duplicate faces without moving a single point, and the rebuild makes it watertight in one pass, resolving overlapping bodies and non-manifold edges. Your original model is never uploaded: it all runs in your browser.
Every edge is shared by exactly two triangles, so there is no doubt about what is inside the model. An open edge is a hole, and different slicers guess differently about how to fill it.
About two extrusion widths: 0.8 mm on a standard 0.4 mm nozzle. Thinner walls are dropped by the slicer or print as a single weak line.
Most FDM printers manage 45 degrees from vertical without support. Set your own limit from an overhang test, or from your printer fingerprint.
It fixes flipped, duplicate and overlapping faces, but no tool can know the shape of a face that is missing. If a real hole remains, it tells you rather than handing back a hollow shell.
No. The checks and repairs run on your own computer, in the browser.