Prusa Commercial BTS: Calibration Cube

This calibration cube is designed to help set accurate exposure and framing for cinematic 3D printing timelapses.

Printed in gravity grey filament, the cube acts as a reliable middle grey reference when lighting a scene. Before starting a long print, I place the cube in frame to:

• Dial in exposure using false color or waveform

• Set consistent middle grey reference

• Fine-tune lighting balance

• Frame up the shot before the actual print begins

The cube measures 25mm × 25mm × 25mm, which makes it small enough to sit on the print bed without blocking composition, but large enough to clearly register on scopes and exposure tools. The consistent size also helps when framing and establishing scale in the shot before committing to a multi-hour timelapse.

Once exposure and framing are locked in, the cube is removed and the real print begins.

Why Use a Calibration Cube?

Timelapses can run for hours, so getting exposure right from the start is critical. This cube provides:

• Repeatable exposure reference

• Faster setup time

• Consistency across multiple shoots

• A simple, printable alternative to traditional grey cards

Recommended Print Settings

Material: Gravity Grey PLA (or any neutral grey filament)

Infill: 15–20%

Layer height: 0.2mm

Supports: Not required

Simple, functional, and surprisingly useful — especially when your lighting setup needs to stay consistent across long prints.

If you use this in your own workflow, feel free to share your setup.