Filament holder with weight sensor

This is a filament holder with a load cell integrated to weigh the filament spool. I thought this would be a fun way to weigh the filament to ensure I have enough for a print without having to resort to a scale. Assembly BOM, tools required and assembly comments are noted at the bottom.

Summary:
Pros
It works. I've tested it on several prints and the load cell is about +/- 0.05 lbs. This will depend on how well you've calibrated the load cell.

Cons
1) Need help with this... if I power cycle the load sensor PCB which I purchased from Spark Fun, the calibration and tare weight are not saved. I'm not very good with software so I don't know how to change the code which was pre-loaded in the PCB so its saves these settings.
2) Because of this issue, I just never turn it "off".
3) Using a load cell with range closer to the full weight of the filament (typical 2kg) would be better. Load cells like most sensors offers sense errors of some percentage based on full scale. In t