Drybox for storing and printing filament, using the Sistema® KLIP IT™ 5.5L/185oz plastic container.
This is an airtight, high-quality tub made in New Zealand. It is the perfect size to comfortably house 1kg spools and desiccant, and is widely available.
https://www.sistemaplastics.com/5-5l-square-1

Features:

• For spools with hubs from Ø48-Ø58mm that are up to 77mm wide, which fits all popular reels up to 1 kg, including Bambu, Sunlu, eSun, Polymaker, Prusa old and new, Siddament, etc.
• Two large desiccant sachet baskets keep filament dry for longer.
• Two alternative clip-in hygrometer mounts for round and rectangular hygrometers.
• Sealed horizontal and downward angled filament ports for M6 pneumatic fittings using 4mm Teflon tube. Allows placing the drybox above or next to the printer.
• Plugs for the filament ports keep interior sealed extending life of the desiccant when not in use.
• Feet which let the container stand upright and that can also clip on to a 2020 extrusion.
• The container stores and nests as usual.
• Sealed 608 bearings ensure smooth unwinding without run-on.
• 3d printed center-marking guides for accurate and quick hole placement.
• Includes a simple, temporary spool holder to use while the reel drum is made. This works okay with plastic reels but is a bit of a struggle with cardboard ones; print two TEMP FLANGE FOR CARDBOARD REEL.STL for pain relief.

NOTE: Please be aware that if you select "Download all files", thingiverse will send you two zip files, not one.

Check out Dept_9's range of print-your-own filament reels:

• UniReel - the Rolls Royce: https://www.thingiverse.com/thing:6896875
• Easy Refill Spool - Bambu Compatible - 2x one part flange: https://www.thingiverse.com/thing:7358401
• Skeleton Spool Refill System - modular hubs and flanges: https://www.thingiverse.com/thing:7315046
• Leftover Refill Spool Flange - small push-in flanges for cardboard refills: https://www.thingiverse.com/thing:7385975
• Compact Loose Filament Spool - for loose leftovers & samples: https://www.thingiverse.com/thing:5634769
• The Bitter End not quite a reel: a secure scrap-filament hanger for Enders: https://www.thingiverse.com/thing:7413168
• Spool Ballast for AMS Rollers: https://www.thingiverse.com/thing:7320829
• Spool Ballast PRUSA version: https://www.thingiverse.com/thing:7385413

General 3D printing accessories:

• Filament Desiccant System: https://www.thingiverse.com/thing:6938476
• Stick-On Hygrometer Mount for filament storage boxes: https://www.thingiverse.com/thing:6929643
• Clip-On Spool Roller for 2020 extrusions: https://www.thingiverse.com/thing:7318417
• Early Warning Filament Low Sensor with a simple mechanical arm: https://www.thingiverse.com/thing:5761257
• Clip-On Maintenance Stands for 2020 extrusions (Ender, etc.): https://www.thingiverse.com/thing:5736229
• 8mm Overspray Shield for lubing z-screws: https://www.thingiverse.com/thing:7400493
• Wanhao i3 Spool Mount [Cocoon] for bigger reels: https://www.thingiverse.com/thing:5871827

Ender specific printing accessories:

• UniSmooth Filament Hanger quick 'n easy, smooth 'n reliable: https://www.thingiverse.com/thing:7419029
• Clip-On Spool Holder that works with Ender brackets: https://www.thingiverse.com/thing:7042254
• X-Gantry Chock Lock-Out secures extruder during maintenance: https://www.thingiverse.com/thing:7035515
• Remote Viewing Filament Swatch perfect for USB cameras/PiCam: https://www.thingiverse.com/thing:5341389
• BL Touch Cover/Mask tames the visual pollution: https://www.thingiverse.com/thing:5249031
• Minimalist QR Cover for Ender 3 v2: https://www.thingiverse.com/thing:7311447
• Filament Sherpa for Ender 3 for clean and fast filament loading: https://www.thingiverse.com/thing:7075219
• Ender 3 v2 Extruder Wiring Loom Hanger for plastic and metal extruders: https://www.thingiverse.com/thing:7034003
• BTT Smart Filament Sensor Mount 18 versions: https://www.thingiverse.com/thing:5395137
• Ender 3 v2 Dial Gauge Mount for bed levelling: https://www.thingiverse.com/thing:5213092
• Ender 3 v2 Hidden OctoPi Mount: https://www.thingiverse.com/thing:5201485

And these two Dry Box systems:

• Using the Sistema 5.5L airtight container:https://www.thingiverse.com/thing:7218437
• And the Sistema 3.5L container: https://www.thingiverse.com/thing:7349995

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Creality

Ender-3 v2

• All the parts are in the correct print orientation.
• Use thicker layers for larger parts, e.g., reel drum and desiccant baskets to reduce print time.
• Use nominal supports for most parts if required.
• Desiccant baskets print without supports.
• To move the filament ports to the other side of the tub, mirror the two ports and the port drill jig in the slicer.