Stackable spool spacer

Maximize your shelf space! Easily stack filament spools vertically with these simple, printable spacers—no more tangled piles or wasted room. This is an updated design with self-aligning pegs on both sides to allow for even more stability.

Problem

Stacked filament spools rub, slide, roll, and generally behave like they’ve had too much caffeine.

Solution

A tiny, lightweight spacer that fits over the Bambu Lab spool hub and keeps stacked spools separated without wasting filament or print time.

Why not just stack spools?

You can — but spacers:

• Prevent spools from rubbing and binding
• Keep stacks more stable if bumped
• Make it easier to grab a single spool
• Don't use a lot of filament

Why this design

• Minimal filament usage (less than 20g per spacer)
• Fast print (under an hour)
• No rods, no towers, no moving parts
• Sized for Bambu Lab / AMS-compatible spools but works on Sunlu V3 and even printable refill spools
• Works on shelves, in closets, or storage bins
• Supports required, but not difficult to remove

This is intentionally boring. Boring works.

Use case

Perfect for:

• Closet shelves
• Open shelving
• Budget filament storage

Anyone who doesn’t want to print a filament organizer that uses half a spool of filament!!