3D printing · Meshes · CAD drawings
An SVG is flat. Making it printable means extruding the outline to a chosen thickness, which turns closed shapes into solids and any enclosed shapes inside them into holes.
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stl · 3mf · obj · ply · amf · dxf · svg · gcode
STEP export merges coplanar triangles into real planar faces, so flat surfaces come through as single selectable, dimensionable planes and CAD imports them quickly. Curved surfaces stay faceted, and there are no parametric features — a mesh has no record of them. Simplify is optional here; leave it off for the most accurate dimensions.
Working
An open path has no inside, so there is nothing to make solid. If your design is drawn as strokes rather than outlines, convert stroke to path in your editor first — in Inkscape that is Path → Stroke to Path.
A shape enclosed by another becomes a hole rather than a separate solid, so a washer comes out as a washer rather than a disc. Nesting is worked out from containment, not from drawing order.
1–2 mm suits keychains and tags. 3–5 mm gives wall art enough presence to not look flimsy. Thicker than about 10 mm is rarely useful from a 2D outline — at that point the shape wants real modelling.
See all supported formats — meshes, 2D drawings and g-code, all converted in your browser.
Upload the SVG, choose a thickness, and convert to STL. The outline is extruded into a solid, with enclosed shapes becoming holes.
An open path has no inside, so there is nothing to make solid. If the design is drawn as strokes rather than outlines, convert stroke to path in your editor first — Path then Stroke to Path in Inkscape.
One to two millimetres suits keychains and tags. Three to five gives wall art enough presence. Much thicker than ten rarely helps, because at that point the shape wants real modelling.
If a file will not convert, or the result looks wrong, I would rather hear about it. Include the format and roughly what you were doing — that is usually enough to reproduce it.