Filament diameter sensor

Proof of concept - measures filament diameter along one axis, based on a hall sensor

3D printer parts and enhancements

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    Description

    This is a proof-of-concept filament diameter sensor, currently intended for an extruder making filament. The filament centerline is 90mm above the mounting surface.
    It picks up the filament's diameter between two bearings, amplifies it via the lever by a factor of 3.6, which moves a magnet in front of the hall sensor.
    The hall sensor's depth is adjustable and is locked into place via the M3 bolt. Bend the hall sensor's leads 90Β° to the back and place the sensor in recessed spot. Lead the wires out to the front.
    The 6x2mm magnet goes into the matching hole in the lever. The second hole intended for a ballpen spring, which is not needed in most use cases.

    For testing, upload the included sketch to an Arduino, connect the hall sensor to 5V, ground and hook the signal pin up to A1 on the Arduino. Connect via serial at 115200 baud, it will start spitting out two values each line, the first one is the smoothed ADC value, the second one the calculated diameter. To calibrate, insert a test object with the maximum diameter you want to measure between the bearings and move the hall sensor carriage until the ADC value just reaches a maximum. Lock the carriage in place and use that value along with the diameter of the object as the last entry in the Arduino's lookup table. Insert two (or more, if you increased NUMTEMPS) more objects of varying sizes (for example the shafts of drill bits) and fill out the lookup table. Use the idle position without anything inserted for the zero-diameter position.

    Support might be required for the files as they contain 30Β° overhangs. If you use Slic3r, you're better off with no support material.

    Fyi, the Solidworks source file is a mess. Sorry.

    Materials and methods

    One of each printed part /// 1xSS495 hall sensor (or equivalent) /// 1x 6x2mm neodymium magnet /// 4x 608 skateboard bearings /// 1 M3x12 screw /// some 8mm smooth rod as axles

    Documents

    Issues

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    Comments

    Dfd63ddaac6cfab93f8de2fb875a2aa7?default=blank&size=40agering added this to the Meins collection ago
    081a6833f658f14a652c31e1d09ac30f?default=blank&size=40drisswikooo added this to the filament sensor collection ago
    Ab070ed6bd35e37649fec781889e92f4?default=blank&size=40stachas added this to the filament collection ago
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    C124dd10b3808cf9bc9935c7df3fc156?default=blank&size=40berna added this to the cosas por hacer collection ago
    272073b8a6ef4a96db1fb9b957086fbf?default=blank&size=40erakan added this to the Arduino collection ago
    D405cff3d792c9173d8e4b9bb3327dbe?default=blank&size=40DaHc added this to the Printer Accessory collection ago
    0632f6f531670cdf9bb378362501d60d?default=blank&size=40Nikoliusv commented ago

    Good afternoon. I assembled the bar extruder, but the diameter is not stable. This sensor seems to me a godsend! Where can I see the connection diagram of the Hall sensor and the Arduin and Motor?

    F54594bde5d3af1b414fae694f17d292?default=blank&size=40Yurii Sharshneou added this to the 3dprint collection ago
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    0bb95cd12922f1c51eeff433989dafe0?default=blank&size=40Mark Oates added this to the sensor collection ago
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    600037501a1abed7d6f583f0bb798298?default=blank&size=40Mike Carr added this to the 3D Tools collection ago
    Mini  sushi chops trans more centeredSushi Desires added this to the Automation collection ago
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    Mini photo 2016 12 26  17 45 38Barrett Dent added this to the 3D Printer - Tools & Mounts - Filament collection ago
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    Bfb509ca3e05773baf9c7b101361429e?default=blank&size=40ekaggrat commented ago

    how do you use it with a 3d printer controller board? sorry for my noobness, but i can understand where is the voltage outputed?

    thanks

    238a0199aaad3212b74d367179e497eb?default=blank&size=40d3vi4nt1337 added this to the Upgrades collection ago
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    Mini  1140400 ssqThomas Sanladerer published this design ago