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String Potentiometer Kit (no housing) (am-2618)
String Potentiometer Kit (no housing) (am-2618)
See Assembled Version in 'How To / Pictures' below.

Price: $17.00

Stock Status: In Stock

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Product Overview:
A great start to being able to use a string pot sensor is here. The only item needed with this kit is the enclosure where the potentiometer and spring tensioned wire meet, this can be downloaded on the "Files & Documents" Tab.

Two options are available, as you can download 3D Prints for the Cap, Case, & Spool. Or you can buy a complete kit that only needs to be assembled.

A portion of the proceeds of this sale will be given to Chap Robotics FRC team 2468, who developed and used this idea on their competition robots.

Included Hardware:


  • Retractable String Length: ~27 inch
  • Spool Circumference: 2.985 in (+/- 0.1)

Note: With the retractable string provided you will only be able to get about eight to nine turns out of the ten turn potentiometer. To get the full range, use the spring from the retractable string component and a 30" string instead.

Average Customer Review: 2 of 5 Total Reviews: 2 Write your own review!

  0 of 0 people found the following review helpful:
Junk February 4, 2016
Reviewer: Anonymous Person  
Tolerances are far too tight where they don't need to be.  Does *NOT* pull/retract reliably if any kind of rapid movement is attempted.  String comes off of spool, wraps around shaft of pot OR gets wound up in the spring.  Might be OK for very delicate and limited movement, but doesn't hold up at all under heavy or repeated use.

(AndyMark Response: We continue working on this design as the retractable string hold has been updated as well.  We offer a fully assembled version as we test each of ours for the quick movements to work without problems.  If you have printed your own 3d housing, each 3d printer may slightly differ on print, and need to be modified)

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  2 of 2 people found the following review helpful:
Good project for learning 3d printing February 9, 2014
Reviewer: David F from Cleveland,Ohio USA FIRST Team 1001  
We used this to learn how to use the MakerGear printer in the KOP.

We did not succeed with the step files as posted, but got others and printed bird's nests, then set the "filament diameter" control and parts started to look OK.  The spring holder slot in the Cap kept breaking off using PLA, so we tried ABS and it still broke off. Raised the extruder temperature to 240 and got a cap that did not break yet.  In Creator, "autoconfigure for print quality:high", filament 1.5 mm, ABS and temp of 240 and we have a part that is working.

Hairspray on glass build bed.

We recommend these changes:
1. don't countersink the holes and use 4/40 socket head cap screws. Kids round out the phillips easily.

2. move string hole completely into the case instead of on the crack between the case and the cap. The string works down the seam and gets stuck. (or move hole to the cap, or rotate the "half circle" so the seam of the circle is perpendicular to the seam between the cap and case).

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