Pen / Tool Holder STL Generator

Create a desktop holder with individual circular slots for pens, markers, brushes and small tools.

Pen / Tool Size

Pen / Tool Diameter (mm) Hole Clearance (mm)The final hole diameter is the tool diameter plus this clearance. 1 mm is a practical starting point for pens and markers.

Slot Layout

Choose the number of slots. The overall holder size is calculated automatically.

Columns Rows Material Between Holes (mm)

Holder Construction

Outer Margin (mm) Holder Height (mm) Bottom Thickness (mm) Outer Corner Radius (mm)

Calculated Size

Final Hole Diameter—
Holder Width—
Holder Depth—
Total Slots—

Preview

FAQ

What can this holder be used for?

It can hold pens, markers, brushes, craft tools, small screwdrivers and other cylindrical tools that fit the selected hole diameter.

How is the hole diameter calculated?

The generator adds the selected clearance to the measured pen or tool diameter. For example, a 12 mm tool with 1 mm clearance creates a 13 mm hole.

Why are the holes separate instead of one large compartment?

Individual holes keep pens and tools upright and separated, making them easier to organize and grab.

How should the holder be printed?

Print it upright with the flat bottom on the build plate. The holes are vertical, so the model normally prints without support.