Filament Scale

thingiverse

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 at https://www.thingiverse.com/thing:2798423, the 3D Printer Filament Scale created by Steven Westerfeld, aka Kisssys. The mounting mechanism and load cell are unchanged but everything else is different. The hardware required includes: * A 5kg load cell with HX711 interface * A 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 * Four 608 bearings * An 8mm or 5/16" steel rod Follow the manufacturer's instructions for connecting HX711 to load cell. Soldering is required for Tripler Base and HX711. Connections include: * 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 with PlatformIO + VSCode. If used with Arduino, you will need to rename main.cpp to a .ino file and load the appropriate libraries. You will also need to calibrate your load cell to the filament weight by measuring the following conditions: 1. No contact reading: Measure the pivot arm not touching load cell 2. No spool reading: Install the pivot arm touching load cell, but no spool installed 3. Maximum load reading: Install a full-sized spool and measure the value 4. Modify default spool selections if desired Library dependencies for PlatformIO include: * HX711 by bogde * ESP8266_SSD1306 by Daniel Eichhorn * OneButton by Matthias Hertel