About this project This is the first model I’ve uploaded to MakerWorld and my first deep dive into OpenSCAD. I’m a computer engineer, and while organizing my art tools with the Gridfinity system, I wanted an automated way to handle different pencil and marker sizes without searching for a new model every time.

I tried a few existing generators, but found them tedious or lacking specific features I needed. My goal was to build a solution that stops wasting filament—instead of bulky bins, this script generates "filament-saver" trays tailored exactly to the tool size.

Version History

• v1.5 (Current): Added "Thin Wall" (1.2mm) presets for every tool. These print 30% faster and use less material while maintaining magnet retention.
• v1.4: Validated dimensions for Posca caps and rounded slot ends to ensure zero collisions.
• v1.3: Corrected base geometry to strictly follow the Gridfinity standard (1.8mm vertical wall).
• v1.2: Added precision M3 screw bores for weighted bases.

The "Easy-Grab" Geometry

The main issue with standard bins is that pencils sit flat on the bottom, making them hard to pick up. This model uses capsule-shaped slots (rounded at the ends). This creates a "teeter-totter" effect—push down on one end of the pen, and the other end pops up. No more digging with your fingernails.

Features

• Rugged vs. Thin: Choose 2.4mm walls for heavy-duty daily use, or 1.2mm walls for maximum speed and efficiency. (1.2mm is exactly 3 perimeters on a standard 0.4mm nozzle).
• Snap-Fit Magnets: The holes have "crush ribs" built-in. You can press 6x2mm magnets in by hand and they’ll stay via friction. No superglue required.
• Weighted/Skeleton Support: Includes M3 screw bores inside the magnet pockets for compatibility with skeleton frames or weighted baseplates.
• Custom Rib Height: You can lower the dividers between pencils (Rib_Height_Trim) to make it easier to pinch and grab thicker markers.

Optimized Profiles (Presets)

I’ve pre-tuned the included profiles to be as filament-efficient as possible. Each is available in Rugged or Thin variants:

• Standard Pencils (Hex or Round #2)
• Mechanical Pencils (Rotring, Pentel, etc.)
• Gel Pens (Pilot G2)
• Sharpies (Fine Point)
• Thick Markers (Expo / Dry Erase)
• Posca Markers (Full Range 1M - 17K)
• Copic Sketch Markers

How to Customize

If your tool isn't in the list, you can use the OpenSCAD Customizer. Rule of Thumb: Measure your pen's diameter, divide by 2, and add 0.3mm.

How to use it: If you’re using a custom tool, measure the diameter, divide by 2, and add 0.3mm for the radius. If you want the dividers to be lower than the pencils for a better grip, set the Rib_Height_Trim to a negative value (like -1.0).

Common Tool Dimensions Reference

Note: The "Recommended Radius" includes a small tolerance (+0.2mm to +0.5mm) so the tools slide in easily.

Posca Marker Guide

I've measured the entire Posca range to save you time. Use these settings for a perfect fit that accommodates the cap diameter and the rounded slot ends:

Note: For the larger markers (PC-8K and PC-17K), I recommend setting Rib_Height_Trim to -2.0 so you can easily grab them.

Pro Tip for Rib Height:

• Negative Value (e.g., -1.0): LOWERS the dividers below the pencil. Best for grabbing thick markers.
• Positive Value (e.g., 1.0): RAISES the dividers. Best for keeping thin tools deeply separated.

Print Settings

• Supports: None.
• Infill: 10-15% (Gyroid or Grid recommended).
• Walls:
  • For "Rugged" Presets: 3 Walls.
  • For "Thin" Presets: 3 Walls (results in solid 100% walls for the 1.2mm shell).