Genmitsu 4040-PRO MAX Review: The Desktop CNC Worth Starting On

The most important part of a hobby CNC is not the frame. It is what spins the bit. Budget machines ship with small DC spindles that cut softwood well and hardwood badly. The 4040-PRO MAX comes with a 710W compact trim router, and that one change moves it from toy to tool.

What it does well

Real power. A trim router at this size can take meaningful passes in maple, oak and walnut. It also takes standard router collets. Woodworkers already know the tool: it is the same class as the compact routers sold for edge work.

Linear guides. The X and Z axes run on linear guides rather than bare rods. Rods flex under load, and that flex becomes chatter marks and lost accuracy. Guides keep the bit where the toolpath says it should be.

A useful bed. Roughly 400 x 400 mm fits cutting boards, house signs, box parts, inlay pockets and small cabinet parts. For anything wider, see the machines in the best desktop CNC routers.

Its limits

• Z height. About 78 mm of travel. Deep 3D carving and thick blanks run out of room, especially with a long bit.
• Router, not spindle. A trim router is loud and its speed is set by hand on a dial. The machine cannot change it mid-job. Hearing protection is not optional.
• Aluminium. It will cut it, slowly, with light passes and a single-flute bit. It is a wood machine first.

Against the alternatives

The FoxAlien Masuter Pro has the same bed size, but its stock spindle is weaker; upgrading it costs the price difference. The 3018-PRO is cheaper but much smaller. The direct-sale Shapeoko 5 Pro and Onefinity Elite are in a different class, at several times the price.