299 TOOLS v1.2.1
299 MODEL WORKS / TOOL RELEASEBLENDER / FIGURE / 3D PRINTING
PUBLIC RELEASE / 2026

299 Tools
for Blender

299 Tools is a Blender helper suite for preparing figure data for 3D printing. It brings together seven tasks that repeatedly came up while turning AI-generated models into printable parts.

PUBLIC TOOLS07

Development and basic testing have focused mainly on AI-generated figure-shaped meshes. Auto Segment is not intended for hard-surface models. You are free to try it, but it probably will not segment them well.

RELEASE

299 Tools v1.2.1 is now ready for release.

The suite includes seven tools: Size from Head Proportion, Simple Pose Helper, Auto Segment, Surface Bridge, Freehand Cut, Backface Check, and Clearance Boolean.
v1.2.1: Added Line Split & Separate to Freehand Cut and refined the UI and drawing controls.

DOWNLOAD

Downloads.

ZIP / PDF
STEP 1 / BLENDER ADD-ON

Download the add-on ZIP first

This is the 299 Tools v1.2.1 package installed in Blender.

299_Tools_v1.2.1.zip
DOWNLOAD ADD-ON ZIP
Important: Do not extract the ZIP. In Blender, use Preferences → Add-ons → Install from Disk... and select the downloaded ZIP directly.
STEP 2 / MANUAL — Download the PDF you need
JAPANESE

Japanese Manual

Japanese PDF manual covering installation and all seven tools.

JAPANESE PDF
ENGLISH

English Manual

English PDF manual covering installation and all seven tools.

ENGLISH PDF

TOOLS / 07

Helpers for preparing figure models.

299 TOOLS v1.2.1
01v1.2.1
Size from Head Proportion screenshot

DIMENSIONS / SCALE

Size from Head Proportion

Calculates finished head size and the required scale factor from the current head dimension, assumed height, body proportion, and target model scale.

02v1.2.1
Simple Pose Helper screenshot

ASSIST / POSE

Simple Pose Helper

Creates a simple rotation reference from the selected region to make small pose adjustments easier without building a full armature.

03v1.2.1
Auto Segment screenshot

AUTO SEGMENT

Auto Segment

Automatically classifies one mesh into multiple part candidates. Review the color-coded result, then re-split or merge parts before finalizing.

04v1.2.1
Surface Bridge screenshot

PROCESS / SURFACE

Surface Bridge

Defines two edge lines along an opening and creates a curved surface between them, with control-point adjustment before confirmation.

05v1.2.1
Freehand Cut screenshot

PROCESS / CUT

Freehand Cut

Two methods: Outline Cut & Delete / Line Split & Separate. Delete an outlined area, or draw from outside the object to outside the other side to create a separate object. Cut surfaces are not capped.

06v1.2.1
Backface Check screenshot

INSPECT

Backface Check

Uses Blender's Face Orientation display to highlight backfaces in red for quick visual inspection before printing.

07v1.2.1
Clearance Boolean screenshot

PROCESS / BOOLEAN

Clearance Boolean

Creates controlled clearance between parts by expanding a cutter and performing a Difference Boolean.

Development /
Test Environment

  • Blender 5.2.1 LTS (primary development/test environment)
  • Mac mini M2
  • 16 GB RAM
  • Windows / Linux: not tested

299 Tools v1.2.1 targets Blender 5.2.1 LTS and has been tested hands-on in that environment.

IMPORTANT / UNITS

About Units

Unit handling can vary by environment, so this section describes only what has been observed in the 299 Tools development/test workflow. It is not a universal Blender, STL, or slicer conversion rule.

Observed development workflow

  • Generated data used for testing displays a head height of about 0.2 m in Blender.
  • With the current export/slicer workflow, the same data is interpreted by the slicer as about 0.2 mm.
  • For Size from Head Proportion, enter the numeric value shown in Blender directly into Current Head Height. Example: 0.1977 → 0.1977.
  • Check the intended finished dimensions in millimeters.
Important: This does not mean that 0.2 m in Blender universally becomes 0.2 mm. Blender unit settings, export format/settings, and slicer behavior can change the physical interpretation. Always verify final dimensions in your slicer.
Head measurement and Size from Head Proportion example

BUG REPORT

If you find a problem.

REPORT FORM

If you encounter a bug or behavior that differs from the manual, please report it below. Blender version, OS, feature used, and reproduction steps are especially useful. We may reply when additional information is needed, so please provide a reachable email address if appropriate.

No file selected
This form is for 299 Tools bug reports. For questions or other inquiries, please use the 299 MODEL WORKS contact page.
CONTACT [JP] ↗

Important

299 Tools does not guarantee correct operation or processing results for every mesh or environment. Save your Blender file before use and keep backups of important data.

299 MODEL WORKS cannot accept responsibility for data corruption, loss of work, or other damages resulting from the use of 299 Tools.