Five things make it unambiguous: machine model, serial number or a photo of the nameplate, a photo of the part itself, its specification, and the quantity. The nameplate photo matters more than people expect — machines of the same model built in different years can carry different drive, optic or power-supply variants, and a part that fits one build may not fit another.

For optics, give the diameter and focal length as well as the position (focusing lens or reflective mirror). For a tube, the wattage and the physical length. A photo alongside the numbers usually resolves it in one exchange instead of three.

They are different categories, and separating them is what makes a stocking list useful. Consumables wear out predictably in normal use — the CO2 tube, focusing lenses and reflective mirrors. Lenses in particular are damaged by dirt rather than by age: a lens cleaned daily lasts far longer than one that is not, which makes operator habit the biggest single variable in optics cost.

Failure items — drives, power supplies, belts, controllers — have no predictable replacement interval but are what stops a line when they go. A distributor holding stock usually keeps consumables deep and one of each critical failure item shallow, rather than the other way round.

Glass CO2 tubes are the fragile case and are packed for it, but no packing makes a long glass tube immune to handling. Shipping method matters more here than for any other part: air freight and courier involve more handling events than sea freight, and the risk in transit sits with whoever the trade term says it does.

So we confirm the shipping method and the risk position with you before dispatching tubes rather than defaulting to the cheapest option. If you are stocking as a distributor, consolidating tubes into a machine shipment is usually gentler on them than sending them on their own.

Yes. A configured BOM lists exactly which optics, drives and consumables a specific build uses, which is what turns a general accessories catalogue into a list you can actually order from. Send the models and serial numbers in the field and we produce it per configuration rather than per model, because options change the parts list.

If you support several customers on mixed configurations, tell us the mix. A common-parts view across an installed base usually shows that a small number of items cover most of the downtime risk, which is a cheaper stocking position than one of everything.