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

prusaprinters

<p>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. </p><p>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):</p><p>I'd use one like this:<br/><a href="https://www.harborfreight.com/2-piece-titanium-nitride-coated-high-speed-steel-step-drills-96275.html">https://www.harborfreight.com/2-piece-titanium-nitride-coated-high-speed-steel-step-drills-96275.html</a></p><p>The Rubbermaid 21 cup cereal box is <a href="https://www.amazon.com?linkCode=ll2&amp;tag=thingiverse09-20&amp;linkId=e4759bff1fa9a55a0f897d801ce2d765&amp;language=en_US&amp;ref_=as_li_ss_tl">Amazon</a> Item "B00XJRMW5M" </p><p><a href="https://www.amazon.com/Rubbermaid-LEPUSEMTE469-711717429496-Container-Everyday/dp/B00XJRMW5M/">https://www.amazon.com/Rubbermaid-LEPUSEMTE469-711717429496-Container-Everyday/dp/B00XJRMW5M/</a></p><p> </p><p>This design, like the original it was remixed from, was inspired by (though not remixed from) YasiekPL's (@ Thingiverse) awesome "Filament dry box dispenser":<br/><a href="https://www.thingiverse.com/thing:3626260">https://www.thingiverse.com/thing:3626260</a></p><p>This will require:</p><p>3x M3x10 screws and 3x M3 nuts.<br/>1x P18 17.8 x 2.4mm O-ring (required for the ball)<br/>1x 22 x 3mm O-ring<strong>or</strong> 22.1 x 3.5mm (preferred size) O-ring for the inside of the cap - use the larger one if you can find it.</p><p>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.</p><p>I used an older version (91512) of the following O-ring kit from Harbor Freight which has the required O-rings:<br/><a href="https://www.harborfreight.com/397-piece-metric-o-ring-assortment-67580.html">https://www.harborfreight.com/397-piece-metric-o-ring-assortment-67580.html</a></p><p>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.</p><p>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:</p><p>Madewithlinux's remix:<br/><a href="https://www.thingiverse.com/thing:3850124">https://www.thingiverse.com/thing:3850124</a></p><p>Mandryd's remix using a PC4-M10-0.9 coupler (includes threads for the coupler):<br/><a href="https://www.thingiverse.com/thing:4035357">https://www.thingiverse.com/thing:4035357</a></p><p><strong>STEP file is included for easy remixing. If you make one, please post it, and if you have a suggestion please post a comment.</strong></p><p> </p><h3>Post-Printing</h3><p>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.</p><h3>How I Designed This</h3><p>This was designed with ViaCAD V9</p><p>Category: 3D Printer Parts</p>