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Spool-Holder Scale / Filament Waage
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pico pi based spool scale with 1kg hx711 scale unit and 4 digit display. adapter for Elegoo centauri carbon.
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Updated at source:
Model information
- Source
- Printables
- Category
- Accessories
- License
- Creative Commons — Attribution — Noncommercial — NoDerivatives
all parts with PLA or PETG, 4 Walls, 20% Infill, adapter and arm with supports.
parts used:
- Joy-it SEN-HX711-01 https://www.conrad.at/de/p/joy-it-sen-hx711-01-waegezelle-passend-fuer-einplatinen-computer-arduino-raspberry-pi-1-st-2475883.html?insert=U3
- Whadda WPI425 Display-Modul https://www.conrad.at/de/p/whadda-wpi425-display-modul-2481855.html?insert=U3
- Button https://www.conrad.at/de/p/tru-components-tc-dt310sw-tc-dt310sw-drucktaster-tastend-1-st-1589487.html?searchType=SearchRedirect
details:
- python code attached. in order to 'calibrate' HX711 use a reference weight and the scale factor in python code (see pic).
- i am using an empty spool to set zero value
- the zero value is stored across power cycles. press the zero button after the initial power-up to create the zero value storage file.
- I am using the scale before and after printing. the filament tension reduces the measured weight during printing. To measure the true weight, ensure the filament is relaxed.
- At the back of the housing a adapter is mount to support multiple printers. current adapter for Elegoo Centauri Carbon.
- power supply via usb cable from ECC USB port to pico pi USB port.
Note Elegoo Centauri Carbon: if pico pi is connected during startup, ECC stucks and dose not boot up. Please let me know if you have a fix for this.
used libs:
- from robert-hh for hx711: https://github.com/robert-hh/hx711
- from mcauser for tm1637: https://github.com/mcauser/micropython-tm1637