Filament guide for dry box, with o-ring screw cover IMPROVED VERSION (STP files included)

This is a remix of my original filament guide, and my filament drybox pass though. The primary improvement over the original is that this uses a 17.8 x 2.4mm o-ring around the ball, which should seal it better and also makes it a lot smoother.

This was designed for a Rubbermaid 21 cup cereal box, , which I am using as a drybox to store filament. The wall thickness this is designed for is 2.8mm. The hole required is 34mm (1 3/8"). I used a forstner bit to cut the hole, but Sibicle (@ Thingiverse) commented that a harbor freight step bit worked well for cutting the hole. I have since used a step bit to drill the hole and it works very well. You should also be able to get the step bits cheaper than a good forster bit (and it will probably work better too):

I'd use one like this:
https://www.harborfreight.com/2-piece-titanium-nitride-coated-high-speed-steel-step-drills-96275.html

The Rubbermaid 21 cup cereal box is Amazon Item "B00XJRMW5M"

https://www.amazon.com/Rubbermaid-LEPUSEMTE469-711717429496-Container-Everyday/dp/B00XJRMW5M/

This design, like the original it was remixed from, was inspired by (though not remixed from) YasiekPL's (@ Thingiverse) awesome "Filament dry box dispenser":
https://www.thingiverse.com/thing:3626260

This will require:

3x M3x10 screws and 3x M3 nuts.
1x P18 17.8 (ID) x 2.4mm O-ring (required for the ball)
1x 22 (ID) x 3mm O-ring or 22.1 (ID) x 3.5mm (preferred size) O-ring for the inside of the cap - use the larger one if you can find it.

A short length of PTFE tube is optional, which is used to pass through the ball and provide a smoother filament path. It is not needed if using the remixed ball (options linked below), which use a pneumatic coupler.

I used an older version (91512) of the following O-ring kit from Harbor Freight which has the required O-rings:
https://www.harborfreight.com/397-piece-metric-o-ring-assortment-67580.html

I also used some clear silicone sealer on the inside and outside covers which should help to seal this further. I included a pic of my enclosure filament pass though which is similar, it shows where the P18 O-ring goes during assembly.

Make sure to check out the remixes of the ball by Madewithlinux's and Mandryd, they are modified to use a pneumatic coupler so a ptfe tube can be connected:

Madewithlinux's remix:
https://www.thingiverse.com/thing:3850124

Mandryd's remix using a PC4-M10-0.9 coupler (includes threads for the coupler):
https://www.thingiverse.com/thing:4035357

STEP file is included for easy remixing. If you make one, please post it, and if you have a suggestion please post a comment.

Post-Printing

I recommend using a step bit to drill the hole. A smaller drill (get it as close to 3mm as you can) was used for the screw holes. I added a light coating of silicone sealant to the mounting plates before securing everything with the M3 screws.

If you find these models useful, please post a like or a comment with some pics of your prints. 

You can find the other things I'm working on at my blog here.  You can also follow me here on Printables to see what new stuff I post. 

 Thanks for looking!

How I Designed This

This was designed with ViaCAD V9

Category: 3D Printer Parts