Filament spool scale

I got tired of guessing how much filament was remaining on the spool, would I have enough to finish the project? Using an arduino uno r3, and a load cell, I set out to solve my problem. I used the arduino tutorial from random nerd tutorials ( Arduino with Load Cell and HX711 Amplifier (Digital Scale) | Random Nerd Tutorials ) to program the arduino, and modified the large spool holder from ratrig ( Official Modifications - Rat Rig Lab ) I used a breadboard to wire up the arduino, scale, hx711, and button, then laid it all out and soldered it to a prototype shield for the arduino. I used jst connectors for all the connections, and then made a wire harness to connect the .96 oled display and tare button. Overall it was a fun project, I've never used arduino before so that was a learning experience. I would say one of the drawbacks is that you still have to estimate the weight of the spool itself. but for 1kg spool I estimate 250g for a plastic spool holder. But you get a much better idea