Filament Dry Box V4L

The Filament Dry Box V4L is a practical solution for keeping your 3D printing filament dry and ready to use. Built around a 4L inverted food storage container, it features a built-in humidity sensor, a silica gel desiccant container, and the ability to print directly from the box.

The upside-down design widens the base and roller support, providing a stable platform that prevents the filament spool from derailing. Additionally, the roller profile is designed to keep the spool centered as it rotates, ensuring smooth and consistent feeding for reliable printing performance.

Refilling the desiccant is straightforward—just flip the container upright. With its functional design and effective moisture control, this dry box offers a practical way to maintain your filament and ensure better printing results.

Required Purchased Parts

(All links are Amazon affiliate links):

• 4L food storage container
• 4 x 608zz or 608rs bearings
• Temperature and humidity sensor
• Bowden coupler (PC4-M5 or PC4-M6)
• Silica gel desiccant beads (bead size > 2mm)

Required 3D-Printed Parts

• 1x Base
• 1x Lid
• 2x Rollers
• 4x Small roller holders

Filament Details:

• Model filament: 96.5g PETG
• Including supports: 105g PETG
• Print time: ~4 hours 40 minutes on a Bambu Lab P1S

Tools Needed

• Drill (4mm for M5 coupler, 5mm for M6 coupler)
• Tapping tool (Amazon affiliate link)

3D Printing Settings

(Used on Bambu Lab P1S):

• Nozzle size: 0.4mm
• Layer height: 0.2mm
• Wall loops: 3

Support Settings:

• Threshold angle: 4°
• Top interface layers: 0
• Bottom interface layers: 0
• Support/Object XY distance: 1mm
• Support/Object first layer gap: 1mm

The base requires support for printing.

Assembly Instructions

Prepare Components:

• Press-fit the humidity sensor into the base.
• Insert the bearings into the rollers.

Assemble Rollers:

• Attach the rollers to the base using the 4 roller holders.

Modify the Food Container:

• Remove the original lid opening cover from the food container lid.
• Press-fit the 3D-printed assembly into the container lid from the inside.

Create Filament Outlet:

• Drill a hole (4mm for M5 or 5mm for M6) 50mm from the bottom edge of the container on its thinnest side.
• Tap the hole using the tapping tool.
• Screw the Bowden coupler into the tapped hole.

Add Desiccant:

• Fill the desiccant container with silica gel beads.
• Secure the lid to the desiccant container by aligning the tabs, press it down and twisting it clockwise.