Gridfinity 1X1 fine tip felt pen holder (cap side down)

Gridfinity 1x1 Four Pen Holder (nib side down)

For use with Sharpie ultra fine, Staedtler Lumocolor 313 (or similar) capped felt-tipped pens.

This is based on the 6U version of the original model, which works fine if you don't mind keeping the nib end of the pen pointing up.   After a while this tends to result in slightly dry markers as they age, so I created a version that allows the pen caps to sit in the holder - the nib is pointed down so gravity assists in keeping them fed with ink.

Compatibility

The holder should work with any capped pen with similar dimensions: 

• Cap max 10mm diameter
• Cap pocket clip 7mm wide and extending approx 3.5mm from cap.  
• Tested with Staedtler Lumocolor 313 and Sharpie ultra fine point permanent markers.  

If in doubt about fit, use Prusa slicer to cut a 7mm section from the top of the model and print that for a test fit.

Printed on a Creality Ender 3 V2 Neo.  I used Overture PLA Professional for the example print shown in the photos.

Lumocolor pens Amazon affiliate link: https://amzn.to/47XtBAa, Sharpie ultra fine marker affiliate link: https://amzn.to/3Orh5Sz (may be purchased at local office supply stores as well)

Print settings 

• Quality PLA works fine
• Recommend at least 15% infill and minimum 3 outer perimeters
• No supports or rafts
• Brim optional if you experience poor bed adhesion/curling at base

Other notes

PLA strength: If you want to press magnets into the base, I recommend using a quality “pro” strength PLA, in my experience cheaper filaments may crack or suffer layer separation when you press the magnets into the base.  Otherwise, you should adjust slicer settings to provide stronger bottom layers (first 5mm or so).