Spool holder that will show you how many g of filament you got left. You will get best results with idle 3D printer, real time readings will be off because of the stress on the filament from the extruder, but you will get rough reading and if you relieve the stress, it will be much closer.

Scale is with tare function so you can take empty spool that you will be using right now, reset the scale, put spool with filament on the holder and see exact weight of filament on the spool.

Model is made for Elegoo spool holder (28.5mm inside diameter, 30mm  wide) and fit is done by spacer so if this does not fit to your printer or you wanna better fit, just write me in the comments exact measurements you need and i will upload spacer for your printer family.

Hardware:

• 3kg load cell ( CZ / ENG )
• HX711 Digital Load Cell Module ( CZ / ENG )
• TG-USBC-P2  connector ( CZ / ENG )
• 6x - DuPont connector with shell ( CZ / ENG )
• 1x - M6x45 bolt and nut
• 4x - M4x16mm bolt with countersunk head
• 4x - 3x16mm screw with countersunk head
• any old USB C phone charger (5V)
• it will cost you around 500 CZK / 20 USD

Printing:

• no supports needed
• tested with PETG, 0.2mm layer, 25% gyroid infill, 3 walls on arm and board covers, 60% infill, 4 walls on rest
• print left arm if you plan to mount holder in left side, right arm for right side, other parts are universal
• parts orientation:

Assembly instruction:

• insert M6 bolt into load cell holder
• mount load cell into the holder, feed the wires first
• attach the arm and secure it with spacer, feed wires through the arm
• attach module box with two 3x16 screws
• attach Dupont connectors, prepare two for USB connector too
• connect load cell to module, wire diagram is in module description and attach USB power connector (if you got negative reading, switch polarity of two wire pairs
• insert buttons and then module to the box. Screw in the cover
• read module manual how to calibrate it
• You will need 3kg weight or maximum weight of your load cell for calibration, thats why i would not go for anything more then 3kg load cell ( You can take kitchen scale, 5L bottle, fill it with water and make exactly 3kg weight for this purpose )

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Do you like what we do ? Give us download and like. We burn a lot of plastic in prototypes so you don't have too. Thx :)