Thingiverse
Pull-pull cord retractor (Automatikaufroller)
von KB_Prototypes
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A automatic cord retractor with auto locking functionality and pull-pull release.
Since pictures during via ferratas are so great but always connected with the hope of not letting your phone fall (or become an oblation to the mountain spirits ;) ) i designed a small helper.
I usually attach it to my pants or backpack on the one side while the phone is connected via a cord through the phone cover.
For printing: Use any material you like to use, but I would recommend PET at least for the rotary bolt to ensure the knob can withstand some impulse from the spring. Supports are usefull for the spool. Ensure that the control curve is smooth. Avoid layerheigths >0.2mm or the small knob of the rotarybolt or the spring slit of the base are prone to break.
Assembly:
1) Thread your cord through the hole of the base and then through the small hole of the spool (see pic).
2) Cut a pice of ~1m of the spring. Bend the ends to form a V at both ends. You might to heat the material with a l
Since pictures during via ferratas are so great but always connected with the hope of not letting your phone fall (or become an oblation to the mountain spirits ;) ) i designed a small helper.
I usually attach it to my pants or backpack on the one side while the phone is connected via a cord through the phone cover.
For printing: Use any material you like to use, but I would recommend PET at least for the rotary bolt to ensure the knob can withstand some impulse from the spring. Supports are usefull for the spool. Ensure that the control curve is smooth. Avoid layerheigths >0.2mm or the small knob of the rotarybolt or the spring slit of the base are prone to break.
Assembly:
1) Thread your cord through the hole of the base and then through the small hole of the spool (see pic).
2) Cut a pice of ~1m of the spring. Bend the ends to form a V at both ends. You might to heat the material with a l
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