Fully customizable round or square 3D-printable coaster holder
All generated models print 100% support-free.

This OpenSCAD generator lets you create a coaster holder tailored to your own dimensions, style, and functional needs. All geometry is parametric, so you can easily produce multiple variations without manually editing the model.

Upload includes the customizable OpenSCAD file plus example model.

Key Features

• Round or Square Holder Shape

Choose the overall shape in the Customizer (holder_shape):

• Round
  Classic cylindrical holder with optional top chamfer.
• Square
  Full square outer shell with square inner cavity and optional square chamfer.
  Side openings automatically align to the four faces.

Both shapes generate solid, functional 3D models that print without any support material.

Size & Fit Options

• Coaster Diameter

Defines the inner size of the holder.

• Coaster Thickness

Thickness of one coaster.

• Coaster Count

Determines the required internal height.

• Inner Clearance

Extra breathing room for smooth stacking and removal.

Wall & Base Options

• Wall Thickness

Outer structural strength.

• Base Thickness

Bottom plate thickness, stays fully support-free.

• Optional Bottom Hole

Great for airflow, lighting, or lighter prints.

Side Openings (Slots)

• Opening Count

• Round: any number, evenly spaced.
• Square: automatically limited to 0–4, aligned to the four sides.

• Opening Width

Adjust the tangential slot size.

• Opening Corner Radius / Chamfer

Smooths the vertical slot edges.

All slot styles remain support-free, even with chamfers.

Finger Notch (Bottom Access Cut-out)

Placed directly under each opening for easy lifting.
Adjustable radius.
Still support-free.

Top Inner Edge Finish

• Chamfered Edge

• Square shape: dynamic square chamfer formed via hull geometry.

Improves handling and prints perfectly with no supports required.

Mesh Quality

Set $fn via the Customizer for fast previews or smooth final models.

What’s Included

• Fully parametric OpenSCAD generator
• Example 3mf +stl model
• Round & square variants
• All options accessible via the Customizer
• All geometry prints support-free

Printing Tips

• Upright orientation
• No supports
• 0.2 mm recommended
• PLA, PETG, ABS all print cleanly