See it work

1. Weigh

Add a spool · 5 of 6 · PLA Orange, 1000 g when full

1,231.6 g steady

empty spool = 1,231.6 − 1,000.0 = 231.6 g

The spool’s empty weight is worked out from this, so later weighings know how much filament is left.

2. Label

Stick on the label, then scan it. Waiting for FT1-K7QMZ…

Code 128, because the NETUM scanner reads 1D codes only. The barcode above is a real one for FT1-K7QMZXHD4WTBR3NPLE6A.

3. Check out

Checked out · going into the printer

1. A1PLA:FFFFFFFFWhite
2. A2PLA:FF6A13FF#3F9A1C07
3. A3PETG:8E9089FFGray
4. A4empty

The P1S reports PLA:FF6A13FF in A2. Only one checked-out spool is orange PLA, so the station matches A2 to it without asking. When a print ends, the slicer’s estimate (here 41.3 g) comes off that spool.

4. Return

Return & weigh · put the spool on the scale

1,186.2 g steady

1,186.2 − 231.6 empty spool = 954.6 g left

The slicer said 41.3 g. The scale says 45.4 g. The scale’s number is the one kept.