FuMesh is a mesh editor I made for fixing 3D models and getting them ready to print, without having to learn a full 3D suite. Version 0.1.0 is out today for Mac, Windows and Linux, as early access.

Early access. This is the first version. It works on my models and prints, but expect bugs and rough edges, and things may change between versions. Keep a copy of your original files, and don’t rely on it for anything important yet.

The FuMesh window with a bulldog model that has five holes and three loose pieces, and Auto Repair’s dry run listing what it would fix — Auto Repair’s dry run: what it would fix, before it changes anything.

Fix the mesh

A model from a download, a CAD export, a sculpt or a scan often comes with holes, loose pieces, bad triangles or a rough surface. Auto Repair closes the holes it is sure about, removes the loose pieces and cleans up the rest, and it can do a dry run first, so you can read what it would do.

Or go step by step: Fill Holes lists every hole with its size and shape and closes it flat or curved, Islands removes loose pieces, Clean Up fixes bad and duplicate triangles, and Smooth evens out rough surfaces.

Fill Holes with five holes in a bulldog model listed, each coloured to match the view — Every hole gets its own colour, in the list and on the model.

Check it before you print

Print Check looks for what a slicer would trip over: holes, loose parts, flipped triangles, self-intersections, walls that are too thin and parts that don’t fit the printer. It sorts what it finds into what to fix and what to look at, and points to the tool that fixes each one.

Print Check reporting three holes to fix, and a non-manifold vertex and three tiny loose parts to review — Holes to fix, and two things to look at.

And the rest

Plane cuts with caps, split, lasso and brush selection, and moving parts into place.
Sculpt brushes to smooth, flatten, move, inflate and deflate.
Union, difference and intersection to combine parts.
Reduce heavy meshes, Remesh into even triangles, Make solid, Hollow with drain holes, Thicken and Text.
STL, OBJ, PLY and 3MF, with units kept from import to export.
A preview before every change, undo for everything, and projects with autosave.

It works offline, needs no account and sends nothing anywhere. It’s free and open source under the GPL.

Early access, shared as is

I made FuMesh for my own models and prints. The code was written with Claude, and I take no responsibility for what it does to your files or your machine: no warranty, no support promise. In this first version the Windows builds aren’t signed, the Mac version is for Apple silicon and has only been tested on the newest macOS, and the Linux version needs a recent distribution such as Ubuntu 26.04. If it’s useful to you too, good.

For the Mac, Windows and Linux. Get it here!