GRMZ - Spool holder with load cell and ESP32
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This product is for people who are asking a question "Will i have enough filament to finish print?"
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Updated at source:
Model information
- Source
- Printables
- Category
- Prusa Parts & Upgrades
- License
- Open Community License v1.1
I have a pleasure to introduce to you my latest project - GRMZ. Created it because I run out of filament and couldn't finish prints so many times it became annoying. During creation process decided to brand it and got inspired by INDX naming convention. So you probably can see it is just GRAMZ :) Spent more time making this logo than I would like to admit just to make it look cool :)
Model is built from two modules, 3 or 4 piece spool holder and electronics enclosure
Spool holder have embedded 2kg load cell as well as HX711 board provided with sensor. To assemble 4x M4 16mm socket cap bolts are needed. sp_base part have slot for HX711 board as well as groove for wires from sensor board to esp32 assembly.
cut sensor wires to 60mm of length and solder to their designated pins
tread board through hole
prepare 160mm wires and solder them to designated places.
wiring schematic soon
Electronics assembly contains 2 3d printed parts, cut down protoboard, Waveshare ESP32-S3-ZERO an one 2 pin JST horizontal connector.
Board is getting power from usb-c socket from printers mainboard and connected with 600mm wire threaded through holes in frame.
Firmware available at https://github.com/3216workbench/grmz
Note - this firmware was created using Claude code and it is on MIT license