PolyMaker PolyDryer Box PTFE Modification

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PolyMaker PolyDryer Box Modifications

I use the fantastic PolyMaker PolyDryer Box for my external spools on my P1S, particularly TPU filament, because you can't really run TPU through the AMS.

The rubber grommets on the Box doesn’t do that well of a job holding the PTFE, and when I try to load or unload the filament the tubing frustratingly gets pushed out.  Also, if you use the back facing port (not the lid port) on the PolyDryer Box you notice it’s the same side as the OEM humidity sensor and desiccant box, so if your Box faces rearward, you can’t see the humidity %.  Additionally, I don’t like the desiccant container being part of the humidity sensor holder.

To remedy these slight issues, I designed a simple coupler to use a PC4-M10 Pass-Through connector, a desiccant box, and a holder for the OEM humidity sensor.

The coupler for the PC4-M10 Pass-Through connector stops the PTFE tubing from sliding out, it’s a much stronger, stable hold than the OEM rubber grommets or those plastic Bowden connectors.  When first installing the coupler, use the PC4-M10 connector to get the threads started into the PLA parts.

You can then use a 14mm and a 17mm wrench to tighten the coupler (use a 10mm for the connector itself.) DO NOT OVERTIGHTEN DO NOT OVERTIGHTEN DO NOT OVERTIGHTEN!!! the connector should bottom-out into the coupler, allowing easy pass-through of the PTFE tubing. In testing, the coupler easily fits the Bambu OEM PTFE (4mm OD), as well as the Ultra-Smooth PTFE I use.

Important: the PC4-M10 connectors (black plastic part, not blue) are the pass-through type.  I found a 10 pack on Amazon for about $5, I needed them to use with a Y-splitter and had extra.

The desiccant box takes roughly the same shape as the OEM one but holds more volume as the humidity sensor has been relocated to the other side.  Please see the pics for clarification.

Coupler and Pass-Through PC4-M10 Connector

Dessicant Box

Humidity Sensor Holder

This works out great for me, hope it works for you.  I printed these in Sunlu PLA+ 2.0 and Ele goo PLA+.  I put the coupler, humidity sensor and dessicant box all on one plate.  The print takes 1hr 40m on a P1S at .20 and uses 31g of filament.

Please leave a comment, feedback, suggestions, or even a boost if you're feeling generous.  It does help me improve my models and really makes my day.  Be kind, I’m old and still sort of new at this.  Seriously, thank you for printing my models!

Before you go, if you’d take a look at my other models under my profile I’d appreciate it: GrayGav @JGray_3D 

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