Dry Filament Storage

With Bowden tube on Lack Tower
Post published on July 18, 2026.

For years the filament roll for my 3D printer has just been hanging from the front of my Lack tower. As I also often have long stretches of time where I don't use much filament, it tends to draw moisture from the air. This reduces print quality, so it's recommended to keep the filament dry.

Ares the cat demonstrating the old setup

So I finally decided to upgrade my printing situation by adding an air-tight container for the filament roll, with a bowden tube running to my direct-drive extruder.

Air-tight box on the lowest Lack tower level
Printer with bowden tube running to the extruder
Back of Lack tower with bowden tube

The 3D printed coupling mount on the extruder is "Sherpa Mini PTFE Coupler Holder (Reverse Bowden, PC4‑M10 coupler)" by sulli18.

I really like the cheap chinese box. The kit already comes with everything except the bowden tube. The filament rolls smoothly on bearings and it even includes a humidity meter.

Part Cost
3D Printer Filament Dry Box Storage Hot-Air Heating Storage Printing Material Holder Moisture-Resistant for Filaments Dryer Box 16.49€
Blue/Orange Indicating Silica Gel Desiccant Beads，Reusable Moisture Absorber for Storage，Closets，Electronics，3D Printer Filament (Blue-9oz) 7.09€
Ultra-Smooth PTFE Tube for 1.75mm filament with Cutter for Extruder,2.5mm IDx4mm OD Length Tube for Bambu Lab A1/P1P/P1S/X1C (White 4M cutter) 4.89€
Sum 28.47€

I simply stuck a bag of silica gel in the bottom. Only later I found out that the blue desiccant has toxic cobalt for coloring, so I'd recommend to buy the orange variant instead.