Pen Cap with Eyelet (for 11mm pens)
thingiverse
A simple cap with an eyelet for marker pens, allowing a string to be securely attached to the pen. Designed specifically for small "sigel" pens with an outer diameter of approximately 10.8mm, the cap's inner diameter is precisely 10.6mm. A larger version is also available for 15mm pens at https://www.thingiverse.com/thing:3983575/. A blog post detailing this design can be found at https://noniq.at/0020/pen-cap-with-eyelet/.
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