How to print a multicolor 3MF map
You want a map model where every layer prints in its own filament: white buildings, blue water, dark roads, green parks, a contrasting frame. This guide covers the whole path for AMS and MMU owners, from exporting the multicolor 3MF in Map2Model to mapping filament slots in Bambu Studio, OrcaSlicer and PrusaSlicer, plus the usual fixes when 3MF colors are not showing. The modeling side is free and runs in your browser, no signup.
What is inside the multicolor 3MF
A Map2Model export is not a painted mesh you have to segment yourself. Each map layer is written into the 3MF as its own part with its own color attached: terrain, buildings, water, roads, greenery and the optional frame. Roads can even split into several parts, because Map2Model styles road classes individually, so a motorway can land in a different slot than a residential street.
Because the colors travel inside the file as real materials, a modern slicer picks them up on import. There is nothing to repaint, no color painting session, no external mapping file. Your job in the slicer is only to decide which physical filament each part color gets.
Step-by-step: from export to full-color print
1. Export the multicolor 3MF from Map2Model
Select your area, hit Generate, and check the live preview. The colors you see there are the colors written into the file, so tune buildings, water, roads and greenery before you download. Then pick Multicolor 3MF in the export options. The merged STL is the single-body alternative for one-color prints; for this guide you want the 3MF.
If you print on an AMS with four slots, it helps to keep the palette to four filaments. Give two layers the same color in the editor and they will map to the same slot later, which saves a purge tower's worth of waste.
2. Open it in Bambu Studio, OrcaSlicer or PrusaSlicer
Bambu Studio and OrcaSlicer load the file as one object built from parts. Expand the object in the sidebar and you will see terrain, buildings, water, roads, greenery and frame as separate entries, each already showing its color. If Bambu Studio asks how to import the file, load it fully rather than choosing geometry only: the geometry-only path strips materials, which is one common answer to the "3MF color not showing" question.
PrusaSlicer imports the same file as a multi-part object. Each part keeps its identity, and on an MMU you assign an extruder per part in the right panel instead of painting anything.
3. Map AMS or MMU slots to the part colors
Add as many filaments to the project as your model has colors, then assign one to each part: blue to water, green to greenery, white or cream to buildings, a dark gray to roads, and something neutral to the terrain and frame. In Bambu Studio and OrcaSlicer that is a per-part filament dropdown; when you send the job to the printer, the AMS mapping dialog lets you match each project filament to a physical slot.
No AMS or MMU? The same 3MF slices fine with a single filament and everything prints in one color, exactly like the merged STL. You can still fake a two-tone map with a filament change at the layer where the terrain ends and the buildings start.
4. Slice with map-friendly settings and print
Map models are friendlier than most multicolor prints: large flat first layer, no overhangs to speak of, short travel moves. A few settings still pay off, covered in detail below. Slice, glance at the preview to confirm each part shows its filament, and print.
Recommended settings for map models
Layer height: 0.12 to 0.16 mm
Terrain relief and rooftop detail live in the Z axis, so finer layers make a visible difference. 0.12 to 0.16 mm is the sweet spot: crisp contours without doubling the print time. A flat city with simple extruded buildings tolerates 0.2 mm if you are in a hurry.
Supports: off for flat cities
Buildings are extruded straight up from the base and terrain rises gradually, so flat city models need no supports at all. Only very steep, exaggerated terrain might want a second look in the slicer preview before you commit.
Brim: the frame already does that job
If you enabled the frame option in Map2Model, the model already sits on a wide, flat perimeter that grips the bed like a built-in brim, and you can engrave a label into it. Adding a slicer brim on top just gives you an edge to clean up afterwards.
Base: keep the 3 mm default
The default 3 mm base makes the plate rigid enough to survive removal from the bed and years on a shelf. Thinning it to save a few grams of filament is the classic way to end up with a bowed, flexible map.
Pitfalls: when 3MF colors are not showing
You opened a Tiles & Puzzle export directly
A Tiles & Puzzle export is a ZIP archive containing one separate 3MF per tile, not one big openable 3MF. Dragging the ZIP into Bambu Studio, or renaming it to .3mf, is the usual cause of the "no geometry data" error. Unzip the archive first, then open the tiles one at a time. Every tile is a complete multicolor 3MF on its own, including the interlocking puzzle edges.
Elevation bands look like a single part
If you colored the terrain with elevation bands, those bands export as real per-triangle materials on the terrain part. That is correct: the terrain stays one mesh, but it carries several filament assignments inside it, one per band. Make sure the project has enough filaments configured, then check the sliced preview; each band should switch to its own color.
The project only has one filament
Part colors are stored in the file, but a slicer project with a single filament maps every part to that one filament and the model looks monochrome. Add filaments in the slicer, or connect the AMS so the slots appear, and the parts spread out across them.
You imported geometry only
Some slicers offer a geometry-only import path for 3MF files. That path discards materials by design. Reopen the file and load it fully, and the colors come back.
Export your own multicolor map
Pick any city or mountain, generate the model in your browser, and download a multicolor 3MF ready for your AMS. Free, no signup. Selling prints requires a license, see commercial use.
Open Map2ModelNew to the workflow? Start with the city map guide, go big with the terrain map guide, or see how to turn a map into an STL when one solid body is all you need.