How 3D Printing Works: A Beginner's Guide

If you've ever wondered what happens between clicking "order" and a Whishy piece arriving on your doorstep, this is the walk-through. No mystery, no marketing language — just the real process from a designer's CAD file to a finished keepsake. About six minutes of reading, useful before your first order.

What FDM 3D printing actually is

The technique we use is called Fused Deposition Modelling, FDM for short. Imagine a precision hot-glue gun the size of a printer head, controlled by a robotic arm in three dimensions, drawing one cross-sectional slice of an object at a time, then moving up by a fraction of a millimetre and drawing the next slice. After a few thousand of those slices stack on top of each other, you have a three-dimensional object. The plastic comes off a spool of filament, gets melted in a heated nozzle at around 220 °C, and gets deposited along the path the slicer software calculated.

FDM has a few defining advantages over the other 3D-printing techniques (resin, SLS): the source material is non-toxic, the finished piece is durable rather than brittle, and the process scales from tiny detail items to objects bigger than your head. The trade-off is that FDM has visible layer lines — those fine horizontal striations you'll see on a piece if you look closely. We don't sand them off; they're part of the look. Some customers tell us the lines are part of why a Whishy piece feels handmade.

The Bambu Lab printers we use

Our studio runs on Bambu Lab printers. They're a relatively recent generation of FDM hardware that brought industrial-tier reliability to a workshop scale: enclosed build volume, automatic bed levelling, automatic flow calibration, vibration compensation, multi-material switching via the AMS (automatic material system). What that means for your order is fewer printer-induced defects, tighter colour matching across multi-component prints, and consistency from the first piece to the hundredth.

We chose Bambu specifically because the alternative — open-frame older-generation printers — required constant manual recalibration to hit the surface quality we want. Bambu's software handles the parts of the process where humans get tired and start making small mistakes, so we can focus on the parts where humans add value: design, colour matching, hand finishing.

What makes Bambu Lab PLA Matte special

Filament is the consumable: spools of plastic that the printer melts and deposits. There are dozens of brands and hundreds of formulations. We standardised on Bambu Lab PLA Matte as our default for most products because of three properties:

• Surface finish. Bambu's matte formulation includes additives that diffuse light at the surface. The result is a soft, almost ceramic-like sheen that doesn't show fingerprints and doesn't reflect harsh overhead lighting back at you. Glossy PLA looks plastic; matte PLA looks like a finished object.
• Layer bonding. Matte PLA has slightly different rheology than glossy PLA — it bonds between layers more reliably, which means thin features (a doll's outstretched hand, the petal of a Sweetberry, the loop of a keychain) are mechanically stronger.
• Colour consistency. Bambu Lab's filament factory has tighter colour-batch control than the smaller hobby-grade brands we tested. Re-ordering a piece six months later in the same "Sakura Pink" gives you the same Sakura Pink, not a slightly-different shade of pink.

For pieces where the surface story is the entire point, we go beyond standard PLA Matte: silk-finish gold and silver for premium pieces, marble for vases, and a glow-in-the-dark blend for kid-facing items. The full colour guide shows every filament we stock.

From your order to a finished print

Roughly six steps. Most happen in the background; one or two involve us actively working on your piece.

1. Configuration capture. When you check out, your colour picks, custom name, font choice, and any notes get attached to the order. The 3D model file (the CAD geometry) is matched to your selections.
2. Slicing. The 3D model gets fed to slicer software which converts the geometry into a list of toolpaths — "at z = 0.16 mm draw this perimeter, then this infill, then move up to z = 0.32 mm" — for the printer to follow. We pick layer height (usually 0.16 mm or 0.20 mm — finer is slower but smoother), infill (usually 15–25 percent — denser is stronger but slower), and where to place support structures for any overhanging features.
3. Printing. The actual print runs anywhere from 90 minutes for a small keychain to 10+ hours for a multi-part family sculpture. Multi-colour prints add time at every layer where the AMS swaps filament. We monitor printers via a workshop camera and Bambu's app; most prints run unattended overnight.
4. Support removal. Once the print is done and cooled, we manually remove the support structures the slicer added. Done with care, this leaves no marks.
5. Hand finishing. Light sanding only where supports came off. Cleaning out any residual filament threads. Quality check against the original render preview to catch any layer defects.
6. Packing and dispatch. Recyclable cardboard, paper-pulp inner protection, label printed, dispatched. You get an email with tracking.

Total elapsed time for most pieces is 5 to 10 business days. Simple keychains and small planters are at the fast end; complex personalised figurines are at the slow end.

Why we chose this approach over injection moulding

Injection moulding (the technique used to mass-produce most plastic objects) is faster and cheaper per unit at scale, but it requires creating a metal mould that runs €10,000 minimum. That mould commits you to one design; changing anything means a new mould. 3D printing has zero tooling cost, so we can run a single piece for one customer with the same economics as a hundred. Personalised lettering, family configurations, colour choices — all of those are free in 3D printing and prohibitively expensive in injection moulding.

For Whishy, the model also matches the values: every piece exists because someone ordered it. There's no warehouse of ten thousand keychains hoping to be sold. There's no end-of-season clearance. The waste profile is lower across the entire lifecycle.

Common questions

Why isn't your piece glossy? Because we choose matte for the reasons above — it looks finished rather than plastic.

Can I see the layer lines? Up close, yes. From a normal viewing distance (a metre or more), they read as a fine texture rather than discrete lines. We can sand and prime certain pieces if you want a fully smooth finish — message us before ordering and we'll quote it.

Is the plastic safe? PLA is non-toxic, BPA-free, phthalate-free. It's not food-safe — don't eat off it — but it's safe to handle, safe for kids to hold, and safe for pets in normal display contexts.

Will it last? Yes, with normal indoor display. The care guide covers the long-term advice: keep away from heat, don't submerge, wipe with a soft cloth.

If you want to know more

The studio is in Niel, Antwerp province. Local pickup is free and by appointment — message us on WhatsApp (+32 499 37 57 71) if you're nearby and want to see a print in progress. Otherwise, the how-to-order page walks through the customer side, and the FAQ covers the most common operational questions. For new orders, the shop is the entry point.