Concrete vs 3D-printed plastic
Every mutegrey piece starts as the same digital model. From there it goes down one of two paths: hand-cast concrete or 3D-printed plastic. Same form, different material logic. I get asked which one to pick often enough that it seemed worth writing down what I tell people in email, in plain terms.
Weight, finish, and feel
Concrete is heavy. A Monument Series piece at default size weighs 70-150 grams depending on the model. The same piece in plastic weighs 40-65 grams. Pick up a concrete version and it feels like a stone. Pick up the plastic version and it feels like a toy in comparison, though the detail is sharper.
Concrete has a porous, granular surface. You can feel the sand. Plastic has visible layer lines if you look closely, but matte PLA in stone grey reads like concrete from across a room. The concrete surface ages: it picks up fingerprints, dust settles into pores. The plastic stays the same.
I sand concrete feet and edges after demould, not the whole skin. That leaves the cast texture intact. Every concrete piece gets sealed with a water-based, non-toxic concrete sealer in a matte finish. The sealer protects against moisture and staining without changing the look or adding gloss. On plastic I tune layer height and orientation so layer lines fall where they matter least. Up close you still see the print. From the sofa you mostly see grey mass and shadow.
Cost and lead time
Concrete costs more because the process has more steps. A 3D print takes hours, but the printer runs unattended. Concrete requires a silicone mould (reusable, but expensive to make), a hand pour, 7-14 days of curing, then sanding and finishing.
Plastic pieces ship in 3-5 business days. Concrete takes 7-14 business days. If you want something soon, plastic is the answer. If you want the material to match the intent of the design (these are concrete-inspired forms, after all), concrete is worth the wait.
The price gap is not arbitrary. Mould labour, cure time, and finishing all sit on my side of the order. A print queue is mechanical. A pour queue is calendar time. I batch concrete pours when I can, but I will not rush a cure to hit a shipping date.
Customisation and sizing
Both materials are available in customisable sizes for pieces in the Monument Series, Estate Staircase, Catchall Bowl, and Vase Series 1. Small, Medium, and Large, up to 250 mm on the longest edge. Fixed-size pieces (Soap Dish, Lamp Series 1, Weather Monitor) come at one size only.
The pricing scales with volume: larger pieces use more material and cost more. Plastic has an additional size-tier surcharge for Medium (+10 EUR) and Large (+20 EUR) because larger prints take significantly longer and tie up the printer.
Concrete sizing changes the mould footprint and pour mass. I check each custom dimension against the master file before quoting. If you are between sizes, ask. Sometimes a Medium plastic sample tells you enough before you order a Large concrete column.
Durability and outdoor use
Concrete is weather-resistant but not indestructible. The matte sealer adds a layer of moisture protection, so spills and bathroom humidity are fine. It can live outdoors in a sheltered spot, though freeze-thaw cycles will eventually crack it. It chips if dropped.
PLA plastic is not outdoor-rated: it softens above 60C and UV exposure makes it brittle over a few months. PETG is better outdoors but mutegrey pieces are printed in PLA by default. Both materials are for indoor use unless you accept the trade-offs.
I design for shelves, desks, and bathroom counters. Not for garden beds or south-facing window sills. If you need outdoor permanence, concrete in a covered porch is the less bad option. Still not a guarantee.
When to pick which
Short version: pick concrete if you want weight, texture, and the full material experience. Pick plastic if you want sharper detail, faster delivery, lower cost, or you are not sure about a form and want to try it before committing to concrete.
Some people buy the plastic version first, then order the same piece in concrete once they know it works in their space. I think that is a sensible path for Monument Series columns and taller vase forms where scale is hard to judge from photos alone.
Pick plastic for gifts when you do not know the recipient's tolerance for heavy objects on fragile shelves. Pick concrete when the piece is the point: a single grey mass on an otherwise quiet surface, something you lift once and remember the weight.
Browse the collection
Every piece in the collection is available in at least one material. Most are available in both. Start with the Monument Series, the Soap Dish, the Catchall Bowl, or Vase Series 1. Product pages list which materials and sizes are in stock for each form.