Filament Scale by mcgeehd

Last crawled date: 3 years, 1 month ago

Update May 4, 2019: Change description from 0.96" to 1.3" OLED
This device determines the amount of remaining filament for a 3D printer.
It is inspired by the thingiverse make: https://www.thingiverse.com/thing:2798423
3D Printer Filament Scale, by Steven Westerfeld, aka Kisssys.
The mounting mechanism and load cell are unchanged but everything else is different.
The hardware required is:
5kg load cell with HX711 interface
1.3" IIC Oled display
WeMos D1 Mini tripler base, standard size, with connector headers
One-Button Shield for WeMos D1 Mini
Dupont connector jumper wires
608 bearings (four are required)
8mm or 5/16" steel rod
Follow manufacturer instructions for connecting HX711 to load cell.
Soldering is required for Tripler Base and HX711
Connections:
The Oled and Load cell can be connected to either 3.3 or 5v
Oled SCl connects to D1
Oled SDA connects to D2
HX711 SDA connects to D5
HX711 SCL connects to D6
You will need to compile and load the program to the WeMos D1 Mini. The program is designed for use for platformio + vscode. If used with arduino you will need to rename main.cpp to a .ino file and load the appropriate libraries.
You will need to calibrate your load cell to the filament weight
Measure the following conditions:
no contact reading -- pivot arm not touching load cell
Record load cell value: NO_CONTACT_U
no spool reading -- pivot arm touching load cell spool holder installed but no spool installed
Record load cell value: NO_SPOOL_U
Maximum load reading -- full sized spool installed and pivot arm contacting load cell
Record load cell value: FULL_LOAD_U
Measure full spool on kitchen scale and record value (grams): FULL_LOAD_G
If desired modify the default spool selections, size and weight
Library dependencies (for platformio) are:
HX711 by bogde
ESP8266_SSD1306 by Daniel Eichhorn
OneButton by Matthias Hertel