Soundproof CNC Enclosure Built With Drywall

My first box was EVA-based soundproofing box. It was made with EVA foam puzzle floor, an easy, cheap and functional soundproofing box (you can see a picture in the last step). However, it was not perfect, and I decided it was time for something sturdier, more practical, and better sealed. This is how BenderBox was born — a CNC sound enclosure built with high-density drywall (Pladur Omnia) instead of wood. Its name? A nod to Bender from Futurama, due to the box’s vaguely robot-like look.

With this soundproofing box machining you can listen your thoughts 😊, it sounds like be walking in a quiet street.

1. 15mm Pladur Omnia drywall panel (high-density gypsum board)
2. Metal angle brackets
3. Dozens of 12mm screws
4. 4 duckbill latches
5. 4 non-cup 170° hinges
6. 4 acrylic sheets (for the door windows — 2 per opening)
7. EVA foam puzzle mats
8. Acoustic foam
9. Hot glue gun
10. Duct tape
11. Painter’s tape
12. Zip ties

I adjusted the dimensions of the box to fit my CNC, a 3020-pro-max, leaving enough room for me to work and prevent the space from getting too hot. The dimensions I used are:

1. Side walls: 56.5 × 57.2 cm
2. Top and bottom panels: 70 × 57.2 cm
3. Back panel: 56.5 × 68.6 cm
4. Door panels: 72 × 30.2 cm (x2)

The drywall was very tough to cut — a handsaw would’ve taken forever. I used an oscillating multi tool with a HSC saw blade to do the job efficiently.

I used metal angles to join the panels. The side and back panels were placed on top of the base for added stability. The angles were pre-drilled using a wood bit (tip hammered into the metal to start the hole) and then fixed with 12mm screws.

The top is removable, held in place with external duckbill latches. This allows me to easily lift it off when servicing or moving the CNC.

A hole in the back allows the power cable to exit. The power supply is mounted to the rear panel using screws and zip ties. Another hole on the right side allows cables for the LED lights and emergency stop button to pass through. Both openings were sealed with acoustic foam after installation.

A strip of LEDs is supported by two metal brackets on the sidewalls. The emergency stop button is housed in a separate enclosure that sits freely on the table for easy access.

The front panel was split into two doors. Each door has 170° hinges and a cut-out window covered on both sides with acrylic sheets. This setup ensures visibility while minimizing sound leakage.

To cover the inside I used EVA foam left over from my previous box (EVAbox) that you can see in the picture with the door open upwards and a black outside. The foam is hot-glued to all interior surfaces and doors.

The rear EVA panel is loose for easier disassembly and provides separation between the CNC and the power supply.