Filament loading is counter-intuitive: buyers assume they are buying space in a container, but in practice they are buying payload. Understanding which limit binds first is what makes a freight quote accurate.
The arithmetic that matters
Using VOXFIL's published 1 kg packing — inner box 206 × 71 × 208 mm, 10 spools per carton, carton 382 × 226 × 433 mm at 14 kg gross — one carton occupies about 0.0374 m³ and weighs 14 kg. That gives roughly:
| Container | Cartons (estimate) | Net filament | Which limit binds |
|---|---|---|---|
| 20 ft | ≈ 880 cartons | ≈ 8,800 kg / 8.8 t | Volume binds first |
| 40 ft HQ | ≈ 1,850 cartons | ≈ 18,500 kg / 18.5 t | Weight binds first |
| Pallet (LCL) | ≈ 60–80 cartons | ≈ 600–800 kg | Pallet height and weight |
These are planning figures, not a loading plan. Real numbers move with palletising, mixed SKUs, spool sizes and road weight rules in the destination country. Confirm the exact plan with your supplier and forwarder.
Why 40 ft HQ flips to weight-limited
A 40 ft HQ offers roughly 76 m³ but a payload near 26 t. At 14 kg per carton, 1,850 cartons weigh about 26 t — the weight ceiling arrives before the cube is full. Consequences:
- Lighter packaging (cardboard spools, trimmed cartons) directly increases net filament per container.
- Bulk spool sizes help further: fewer boxes and less packaging per kilogram on 3 kg and 5 kg spools.
- Mixed pallets with air gaps waste both weight and cube — a documented pallet pattern pays for itself.
What to ask for in the loading plan
- Cartons per pallet and pallets per container, with dimensions
- Net vs gross weight, and gross per pallet
- Stackability and maximum stacking height
- Whether pallets are exchangeable, one-way or heat-treated (ISPM 15)
- Container utilisation: cubic meters used and payload used
Common loading mistakes
- Quoting freight on a volume assumption when weight binds
- Forgetting that destination road rules can cap container weight below the ocean limit
- Ordering full pallets when a mixed pallet would have absorbed a slower SKU
- Not reserving capacity for a fast-moving color that will sell out mid-cycle
VOXFIL supplies carton and pallet dimensions per SKU, can provide a loading plan for your order mix, and photographs outgoing pallets on request so you can see what shipped. Start with wholesale terms or request a loading plan.
Frequently asked questions
How much filament fits in a 40 ft container?
Using a 14 kg carton of 10 × 1 kg spools, roughly 1,850 cartons — about 18.5 tonnes net — before payload limits. A 40 ft HQ is normally weight-limited rather than volume-limited, so packaging weight changes the answer.
Is a 20 ft container better for a first order?
Usually yes. A 20 ft container is volume-limited at roughly 880 cartons (about 8.8 t net), which lets you test a mixed SKU range without carrying 26 tonnes of one material.
Do cardboard spools increase container payload?
Yes. A cardboard spool weighs less than a structural plastic spool, so a weight-limited container carries more net filament — a direct landed-cost saving on bulk lines.