Ultimate Filament Storage

The Lab Report

Testing Methodology: The filament has been stored in this solution for over 6 months and humidity levels are remaining near 10%. The solution is working well and it remains the go-forward solution for all my filament storage.

Quick Verdict

Extremely airtight; holds <20% humidity for months.
Cost-effective at ~$20 per setup.
Requires a large 3D printer for the internal chassis.

The Rick-Approved Setup

This system combines high-grade industrial gasket bins with a 3D-printed internal chassis. It's designed for people who want their filament ready to print the second it's loaded.

The 3D Printed Core

Don't forget to print the internal rack system to keep everything organized:

MakerWorld: Drybox System

Required Materials & Hardware

Fast Track: 1-Click Complete Setup

Rick's Ultimate Dry Box Kit

Need all 3 core components to build this system today? Here is the exact shopping list to achieve 10-15% humidity.

Sterilite 20 Qt Gasket Box Color-Indicating Silica Gel Digital Hygrometer

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Core Housing #1 Top Pick

Airtight Bins

These specific 20qt/44qt bins are the only ones I trust. The foam gasket is thick enough to compensate for lid warping.

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Rechargeable Reusable

Silica Gel

Indicating beads are a must. When they turn dark green, pop them in the oven and they're brand new.

View on Amazon Browse Bulk 5lb - 10lb Jugs

Monitoring Instant Read

Hygrometers

I stick one of these to the front of every box so I can check humidity levels at a glance without opening the lid.

View on Amazon Multi-Pack Discounts (4-12 pk)

Material Direct Partner

Sunlu PETG

My primary printing material. Reliable, consistent, and fits perfectly into these storage bins for long-term use.

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Pro Level Upgrade

Active Heated Dryers

Important rule of thumb: Desiccant maintains dry spools, but if filament arrives saturated with moisture from the factory, you must bake the water out first.

Single Spool ~$55

SUNLU S2 Filament Dryer

360° upper and lower heating plates with a digital touchscreen and real-time humidity display. Perfect for drying individual spools right beside your printer.

Heats up to 70°C (PLA, PETG, ABS, TPU, Nylon)
Feed filament while drying in real-time
Compact footprint on workbench

Check Sunlu S2 Price on Amazon

Maker Favorite

4-Spool High Capacity ~$149

SUNLU S4 Quad Spool Dry Box

The gold standard for multi-material printers and print farms. Holds 4 full spools at once with high-power 350W PTC heating and automatic circulating blowers.

Dries 4 rolls simultaneously
Ideal companion for Bambu AMS or multi-color setups
Auto-humidity maintenance mode

Check Sunlu S4 Price on Amazon

DIY Custom Mod Hardware

Want to Feed Filament Directly Out of the Box?

If you're printing the MakerWorld drybox rack, you'll need airtight pneumatic fittings and smooth skate bearings so the spools roll with zero drag:

PC4-M10 Pneumatic + PTFE Kit 608-2RS Bearings (10-Pk)

Top Material Recommendation

Why I Print with Sunlu PETG

For everything I build, reliability is key. Sunlu PETG has become my primary material because of its consistency and strength.

The Spool Design is Genius

"I really enjoy the design of the Sunlu spools. They have a clever removable side feature that allows you to take unfinished filament off the spool easily. This is a game changer if you need to swap the core to another spool or just store the filament more compactly without the plastic bulk."

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