Why PLA Beats MDF for Tabletop Terrain (And Why It Matters More Than You Think)
If you've been in the tabletop hobby for a while, you've probably built, bought, or broken a fair amount of MDF terrain. Laser-cut MDF kits have been around forever, and for a long time they were just... what terrain was made of. But as 3D printing has come into its own, we've had a chance to step back and ask an honest question: is MDF actually a good material for this hobby?
We think the answer is no — and not just for one reason. Here's why we print everything in PLA, and why we believe it's genuinely the better choice for hobbyists and the planet alike.
What's Actually in MDF?
MDF (medium-density fibreboard) looks like a simple, natural product. It's just wood, right? Not quite.
MDF is made by breaking down wood fibres and binding them together under heat and pressure using synthetic resins — most commonly urea-formaldehyde (UF) or melamine-formaldehyde (MF). These resins are what give MDF its uniform density and smooth surface. They're also the source of some significant concerns.
Formaldehyde off-gassing is one of the most well-documented issues with MDF. Formaldehyde is classified as a Group 1 carcinogen by the International Agency for Research on Cancer (IARC). Freshly cut or sanded MDF releases formaldehyde gas into the air — which is why anyone who's worked a laser cutter on MDF in an enclosed space knows that particular acrid smell. Over time, sealed MDF continues to off-gas at lower levels, even when it's just sitting on a shelf.
For a terrain piece that lives on your gaming table, in a storage box, or on a hobby shelf in your bedroom — that's not a trivial consideration.
Beyond formaldehyde, the production of MDF involves:
- Binders and resins derived from petrochemicals
- Waxes added for moisture resistance
- Chemical hardeners and catalysts used in the bonding process
None of that is particularly transparent in the final product you buy. And when MDF eventually reaches the end of its life, it can't be easily recycled — the resin content makes it difficult to compost or process through standard timber recycling streams.
PLA: A Different Story
PLA (polylactic acid) is the filament we use for all of our standard terrain, and it's a genuinely different kind of material.
PLA is made from fermented plant starch — typically corn, sugarcane, or cassava. It's a bioplastic, which means it starts life as a renewable agricultural resource rather than a fossil fuel. Unlike many industrial plastics, PLA doesn't require petroleum-based feedstocks to produce.
There are no formaldehyde binders. No petrochemical resins. When PLA is printed, it does produce some fumes — that's true of any heated filament — but the compounds released are significantly less hazardous than those from cutting or engraving MDF. Many makers run PLA printers in home workshops without specialist ventilation; we wouldn't say the same about running a laser cutter on MDF.
At end of life, PLA is industrially compostable under the right conditions, and increasingly there are filament recycling schemes (like the one we use through KiwiFil here in New Zealand) that recover and reprocess waste PLA back into usable filament. We recycle 100% of our printing waste — something that simply isn't possible with post-cut MDF offcuts bound together with formaldehyde resins.
Stability and Longevity: How Does the Terrain Actually Hold Up?
This is where the practical hobbyist argument comes in, and it's one we feel strongly about.
MDF and moisture do not get along. Anyone who's left MDF terrain in a slightly damp garage, a car boot overnight, or even an older storage box will know the result: swelling, warping, delamination. The wood fibres in MDF are highly hygroscopic — they absorb moisture from the air — and once they do, the structure starts to break down. Repeated moisture exposure causes the layers to separate, edges to fluff, and surfaces to bubble. Primer and paint can help seal MDF, but they don't eliminate the problem — they just slow it down.
PLA, by contrast, doesn't absorb moisture in the same way. A printed PLA terrain piece left in a box for a year will come out looking exactly as it went in. It doesn't warp, swell, or delaminate in response to ambient humidity. For terrain that lives in storage between games — which is most terrain, most of the time — that matters enormously.
Impact resistance is another area where PLA holds its own. MDF has a tendency to chip at edges and corners, especially on thinner laser-cut pieces. The interlocking tabs that hold MDF kits together are notorious weak points — snap one, and that piece is compromised. PLA terrain, particularly when printed at appropriate wall thicknesses and infill settings, handles the bumps and knocks of a game bag or terrain box better than thin MDF ever will.
Detail retention over time is where 3D-printed PLA genuinely shines. The surface detail in a printed piece — the texture, the panel lines, the greebles — is locked in permanently. It won't wear away, absorb paint unevenly, or change over years of use. A piece you buy from us today should look just as good in a decade as it does the first time you put it on the table.
The Fold-Flat Factor
One last thing worth mentioning: the reason our terrain can fold flat for storage isn't just clever design — it's made possible by the material.
PLA has just enough flex at the right thicknesses to allow a hinge-style joint to function without snapping, while being rigid enough to hold its shape during play. MDF simply can't do this. Flat-pack MDF terrain exists, but it relies on separate tabs, slots, and assembly steps every single time you set up. Our fold-flat designs snap into position and fold away in seconds, in the same piece, because PLA lets us build that kind of mechanical behaviour directly into the print.
So What's the Bottom Line?
MDF has had a good run, and we're not here to dismiss every kit ever made with it. But when you look at the full picture — the chemistry involved in its production, the sustainability of the raw materials, the way it behaves over time and in storage — PLA is the better material for tabletop terrain. Full stop.
We chose PLA from the start because it aligned with what we care about: making terrain that lasts, doing right by the environment, and being honest about what goes into the things we make.
Every piece we print in our Canterbury workshop is made with locally sourced PLA, printed to order, and backed by our commitment to recycling 100% of our printing waste. No formaldehyde. No off-cuts in landfill. Just solid, detailed terrain that'll outlast the edition it was built for.
If you've got questions about materials, printing, or anything else terrain-related, drop us a message — we're always happy to talk shop.