In FabLab where I am we dont have a big CNC machine, we only have a small Carvey machine to machine.
And as I wanted to make a slightly large lamp I used a breathe material because it would be easier and faster in the Carvey machine.
To make the prototype of the model I decided to used as a material a XPS extruded polystyrene boards called roofmate.
The roofmate is a spongy and sturdy boards taht it's use to insulate the sound in our homes.
For this project this foam is hard enough for the shape of the mold and easy to mill in the cnc machine.
After the 3D model is done it is necessary to cut it in the milling machine.
For this, I saved the 3D model of the lamp in 3 different STL files, so that it fit in the milling machine.
Then I used the MeshCam program to define the bits for cutting the mold. And the Easel.inventables program to send information to the Carvey machine.
I cut my lampshade in the carvey machine in three parts and at the end I glued them together.
I do not advise to use this material because it makes a lot of dust and rubbish that has been put in the holes of the machine and was very difficult to clean.
I used sandpaper to get better finishes.
Before I started putting the fabric in my lampshade I studied what would be the best plan to unroll the sphere in the fabric so as not to create folds.
After that I started to plan on the fabric and on the release film and peel ply and cut it.