Designed & 3D printed in Milton Keynes
Your stack
deserves
better than
a drawer.
We take a hard-shell case that's airtight, watertight and lockable, then design and 3D print a PETG insert cut to your exact format. Every coin, every bar, held in its own seat. Nothing rattles. Nothing rubs.
The Range
Six formats.
One obsession with fit.
Each insert is drawn around the thing it holds, then printed to order in your colour and finish.
The Case
A shell built for
the worst day,
not the best.
We buy in a proper hard-shell case — the kind used for tools and camera bodies — because your metal shouldn't be trusted to a jewellery tray. Then we make the inside worthy of it.
Airtight & watertight
A full perimeter gasket seals the case against damp, dust and spills.
Built-in air valve
Equalise pressure and circulate air without breaking the seal.
Lockable latches
Reinforced catches with padlock points, plus a moulded carry handle.
Stacks square
Interlocking top and base, so a growing collection stays a tidy column.
Coin wells cut to 40 mm
Sized for standard 40 mm coin slots, so most 1oz coins and capsules seat straight in.
Bar channels that flex
Hollow all the way through with foam padding both sides — they close on larger and smaller bars alike, instead of fitting one mint and no others.
How It's Made
Bought in.
Then made ours.
We're honest about it: the shell is sourced. Everything that makes it an MK Bullion box happens here.
Source the shell
We buy hard cases with a real gasket seal, an air valve and lockable latches — then reject the ones that don't close square.
Model the insert
Each format is drawn from measured samples, with tolerances tight enough to hold but loose enough to lift out one-handed.
Print in PETG
Printed to order in your colour. PETG over PLA because it takes heat, takes knocks and doesn't go brittle in a cold safe.
Fit, check, dispatch
Insert seated, latches tested, engraving checked. Next-day dispatch, or collect from us in Milton Keynes.
Colourways & Finishes
Three standard colours.
Two finishes. Or ask.
Because we print each insert to order, the colour isn't a stock decision — it's yours. Outside the three below? Message us before you buy.
Custom Engraving
Put your name on it.
Your name, your initials, a date, a stacking milestone — raised into the insert as it prints, not stuck on afterwards. Type it into the builder and we'll confirm the layout with you before anything goes on the bed.
Try it in the builderQuestions
Before you order
Is the case genuinely waterproof?
Why PETG rather than PLA?
Will it fit my exact coins and bars?
Coins: the wells take most standard 40 mm coin slots, which covers the great majority of 1oz bullion coins and capsules.
Bars: the channels are hollow all the way through with foam padding on both sides, so they close on larger and smaller bars alike rather than being cut to one exact size. That's deliberate — bar dimensions vary between mints, and the foam takes up the difference.
Storing something unusual — slabbed grades, oversized capsules, an odd format? Message us with the exact product first. We'd rather cut you a custom insert than sell you one that won't close.
Can I have a colour that isn't listed?
How does custom text work?
How quickly do you dispatch, and can I collect?
Do you sell the bullion too?
Get In Touch
Tell us what
you're storing.
Every box is made to order, so an order starts as a conversation. Send the form, or message us directly — we usually reply the same day.