.CTB File Extension

AutoCAD Color-Based Plot Style File

Developer Autodesk
3.7  |  21 Votes

What is a CTB file?

File used by AutoCAD, a CAD program used for 2D and 3D drawing; contains color-based plot styles, or mappings of colors to layers of objects; used to attach color and display settings to design objects.

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CTB files can be replaced by the newer .STB format, which abstracts layer color-based properties to object-based properties. Many companies still use CTB files instead of STB files because of the cost required to train personnel and to upgrade existing CAD designs.

NOTE: CTB files and STB files cannot both be used within the same CAD design. CTB files may be converted to STB files using AutoCAD.

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Programs that open or reference CTB files


Cherrytree SQLite Document

Developer giuspen
3.0  |  7 Votes

A CTB file may also be a document created by Cherrytree, a note-taking application. It stores document data in SQLite format, which may include text, tables, images, objects, and document settings. CTB files protected with a password are saved as .CTX files.

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Users typically save Cherrytree documents as CTB or CTX files. However, they may also save documents in XML format as .CTD files. Password-protected CTD files are saved as .CTZ files. CTD and CTZ files are useful for saving documents that are smaller in size than CTB and CTX files.

NOTE: Cherrytree is developed by giuspen, a portmanteau of Giuseppe Penone.

Programs that open CTB files


Chitubox Sliced 3D Model

Developer Chitubox
4.0  |  2 Votes

A CTB file may also be a sliced 3D model created by Chitubox, a program used to prepare 3D models for 3D printing. Using a CTB file, various 3D printers can print the model the file describes.

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Screenshot of a .ctb file in Chitubox
CTB file open in Chitubox

Chitubox allows 3D printer users to import, arrange, edit, and slice 3D models for printing. Slicing a model converts that model into a set of instructions that a 3D printer uses to print the model (by printing "slices" of the model atop or alongside each other, until the whole model is printed).

Chitubox can save sliced models in several formats, including the CTB format. Several 3D printers with which Chitubox is packaged (such as the Elegoo Mars 2 Pro) can print only models saved in the CTB format. Others can print only models saved in Chitubox's .CBDDLP format.

NOTE: CTB files created by different versions of Chitubox are saved in slightly different file formats. Thus, a 3D printer may be able to print some CTB files but not others.

How to open a CTB file

You can open a CTB file with Chitubox Basic (available for free) or Chitubox Pro (available as a free trial). To do so:

  1. Open Chitubox's sandwich menu (located in the program's upper-left corner).
  2. Select Open....
  3. Navigate to and open your CTB file.

After opening your CTB file in Chitubox, you can transfer the file to a connected 3D printer, edit the model(s) the file contains, or convert the file to another sliced 3D model format.

How to convert a CTB file

To convert a CTB file to another sliced 3D model format:

  1. Open the file with Chitubox.
  2. Click Back, then Slice, then Save.

You'll then be able to save your CTB file in any of the slicing formats listed here.

Programs that open CTB files

Category: CAD Files
Updated: November 27, 2023

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