BoxTurtle Enclosure Desiccant Dryers

Warning: Work In Progress!

This project is still fairly early and may experience significant changes.  Feedback welcome.

Printing

• 3 shells, top & bottom layers @ 15% infill should be fine
• PLA, ABS+, PETG, etc should all be fine.  ABS will tend to warp for the larger pieces, but if you have good enough bed adhesion and use a brim, it should be “good enough”
• Sorry, right now parts are not oriented correctly.  Should be obvious.  Nothing needs supports.
• Note that the enclosures have 3 print in place supports in the holes for the humidity sensor and rear power port.  Just remove with your fingers or xacto knife.

Other Parts (per box, left or right)

• 30x Voron spec M3x4mm heat set inserts
• 2x 8025 fans.  If you're noise sensitive, I suggest using proper 4pin PWM fans (like the Artic P8 PWM PST CO)  for best results.  But I suppose any 8025 fan will do that you can figure out how to power & control.
• 13x M3x30mm bolts
• 16x M3x8mm bolts
• A square foot of screen door/window screen material
• Rectangle humidity sensor like this
• Some bulk loose desiccant

If not obvious, you'll need some way to power the fans.  I used a spare fan header on my Voron2 controller board and wired up for PWM, but you could also use a dedicated external fan controller/etc.   Personally, I couldn't stand 2800RPM / 30dB fans at 100% because they were too loud. YMMV.

Assembly

Look at the photos.  The fans should be configured for push / pull so air flows from one opening to the other.  There is a channel in the side of the airbox so you can connect them together (see photo).  Install the heat set inserts in all the holes.  Screen material should be cut and placed inside of the airbox and then fixed into place using the Fan Cover.  Just push the M3x30 screws through the screen and tighten.

I've provided two different Power Port options.  One for the thin fan cables used by the Artic P8 PWM series and another for a 5.5mm x 2.1mm power plug like this.  I've also provided the sketch dimensions for the holes in the rear of the enclosure to aid in designing your own power port.  Eventually, I'll share the Fusion file.

Usage

I completely fill the airbox with desiccant (~375 grams) as the fans will seem to have little difficulty moving enough air.  The more desiccant you use, the longer it lasts.

Notes

Right now I'm seeing 24-48hrs of 10-20% RH in my Box Turtle (roughly 55% RH ambient) with two of these driers and the Polydryer turned off.   After that, the desiccant is effectively consumed and no longer able to remove moisture from the air.  Will need to either dramatically increase capacity, improve sealing, and/or add a PTC heater?

Change Log

• 2025-07-18 - Make slightly larger to support easy to replace desiccant cartridges to make swapping the desiccant easier/faster.