Easy 3D Topographical Maps With Slicer





Introduction: Easy 3D Topographical Maps With Slicer

About: Analog maker dabbling in digital manufacture

Here's a super easy way of making a 3D topographical map of anywhere in the world: you could literally be laser-cutting a map within 10 minutes of reading this instructable. I've always liked maps like these and there are some great tutorials out there... but the complexity had always put me off. But I recently learned how to use Slicer for Fusion 360, a plugin for Fusion 360 (free to educators, students and hobbyists) that slices up STL files into pieces that you can stack together and make a 3D model. So I figured all that I needed was a utility that converted terrain into an STL, and happily, there exists one in Terrain2STL.

Note: this instructable was updated in January 2018 to reflect changes in the software.

Step 1: Select Your Area of Interest

Go to the wonderful Terrain2STL utility. You will be greeted by an interactive Google map. Navigate to the geographical area of interest by zooming and dragging, and click "Center To View". Go next to Model Details, and use the Box Size slider to make the red box large enough to incorporate the feature you want. Be aware however that the larger the feature you select, the bigger the STL file you will end up downloading. To start with, I suggest you pick a box size of 1080 or smaller. Under Water and Base Settings, set the Water Drop to 2 mm (to ensure that the shore is clearly demarcated) and the Base Height to the minimum 2 mm. You're ready to make your STL file! Click Create and Download.

Step 2: Slice It

Open Fusion 360, and select Insert... Mesh. Browse to your downloaded STL file, and open it. Now go to Make... Slicer for Fusion 360, and it will launch as a new program (which used to be a standalone product called 123D Make).

You will end up slicing the model, and you may have to rotate the Slice Direction so the material stacks as horizontal layers.

It is important to consider what you are going to make the model out of. Click on the pencil under Manufacturing Settings and specify the width, length and exact thickness of the material you are going to use. Under Select a Technique... choose Stacked Slices. Now, adjust the model size until you get a form that is pleasing. Very often, you will need to exaggerate the vertical scale to get interesting topography, and to get the features you want accurately displayed you may have to tweak the overall size of the model. Once it has taken a form you like the look of, click on Get Plans (the Nested option uses material slightly more efficiently) and export the plan as an EPS file.

I strongly recommend starting with cardboard - the material itself is cheap and the cutting time is fast.

Step 3: Clean Up the Files and Prepare for Laser Cutting

Open the EPS file in Illustrator or Inkscape or CorelDraw or whatever vector drawing program you like, and tidy up the files. I delete the border, delete layers I don't need (often full sheets with no features on them that are generated because the feature I'm mapping is at high elevation), and improve the nesting for efficient cutting. I also delete the numbers and pinholes* from the top layers.

I then set the line thickness to 0.001" (which the Epilog lasers I was using recognize as cuts rather than rasters), and enable color mapping. Set blue up to cut (whatever setting is appropriate for that on your machine) and red up to cut but at maximum speed and a MUCH lower laser power, so it only very lightly scores the surface.

* these are added by Slicer to aid assembly, but topographical maps are easy to put together because the shapes are all unique and there are no overhangs, so you don't need them.

Step 4: Laser Cut and Assemble

Send your files to the laser cutter (or service). Free all of the pieces from the sheet and lay them out in numbered order.

Assembly is easy and quite fun for simpler maps. Just glue each layer one at a time (you did lay them out in order, right?), using the scored lines as a guide. You pretty much can't go wrong provided you're careful to line everything up.

This example was Mt Taranaki, a beautiful Fuji-esque volcano on the west coast of New Zealand's North Island, rendered in corrugated cardboard. The vertical scale is slightly exaggerated. This glue-up took me 10 minutes. The time lapse was recorded using my orbiting time lapse rig.

Use the appropriate glue for your material. A glue stick is fine for cardboard.

Step 5: Add Water

I really wanted a version with water that showed depth, so I got some pale blue transparent acrylic and used it to represent water. Terrain2STL does not provide bathymetric data (which would be cool!),* but for the effect you want it doesn't really need to be super-accurate. I just looked up a bathymetric map and eyeballed a few layers. You will need to cut the underwater land (I hope that makes sense) out of plywood (or whatever) and the water out of acrylic. Use more than one layer for best effect. This example was done with Tuhua (Mayor Island), a dormant volcano off the coast of New Zealand near where I grew up. It's far enough off shore that it is sometimes lost in the haze, but big enough that when it does emerge it looms enigmatically on the horizon. It's spectacular; the hiking and fishing and snorkeling are all world class.

I liked the look of the island in its raw plywood + blue acrylic form, so didn't bother finishing it.

* I've corresponded with the author of Terrain2STL on this topic and got this reply "As for bathymetry - do you know of a good global bathymetry data set? I've looked into it a bit in the past but I haven't found a good, global map for ocean depth. Do you know of any? I'd definitely be interested in looking into adding it to the site if we can find a good dataset." Anyone?

Step 6: Experimenting With Finishes

I tried making the area around where I live (Saanich, BC) out of green stained plywood and one layer of acrylic for the water. This map was really fussy to make, and I strongly advise starting with something simpler. All those tiny islands were a pain in the neck. If you end up with too complex a map, consider smoothing it in Fusion 360 before slicing it, or simply delete the smaller features altogether.

If you end up making a topographical map using this method, please post a picture & I'll send you a free premium membership.

7 People Made This Project!


  • Oil Contest

    Oil Contest
  • Creative Misuse Contest

    Creative Misuse Contest
  • Water Contest

    Water Contest

62 Discussions

I would love to make this. Unfortunately 123d is no more. Can anyone advise what software I could use to replace it to do the same job? I’m new to the laser cut world so any advise would be gratefully received. Thanks!

3 replies

Instructable now updated for Slicer for Fusion 360. Let me know if you have any issues.

That's amazing, i will try this shortly and let you know how i get on. Thanks again.

It's now part of Fusion360, and is called "Slicer". I will try to get this instructable updated when I have some spare time... in short supply at the moment! If you get Slicer working any feedback very welcome

Thank You so much for putting this together. I just got my GlowForge and I'm trying to jump right in. It seems that Terrain2STL isn't detailed enough for my needs. I'm trying to do a mountain that's approx. 3 miles x 3 miles. Mine is coming out really blocky. Is that normal? Is there a way to get higher quality files?

1 reply

That is normal, the resolution is pretty low. I don't doubt there are higher res topographical maps out there, but I don't know of ones that also neatly convert into .STL files. If you find a source, please let me know and I will update the instructable

if i wanted to make one of a lake, how would i go about doing that?

1 reply

See step 2. Bathymetric data not available in Terrain2STL

I love this instructable! But I'm having trouble with Terrain2STL -- whenever I import to TinkerCAD, I just get a bunch of flat looking disconnected boxes...am I just not picking interesting topography? I'm trying to test this project for 7th graders who are modeling early American colonial landscapes so I've tried this with Jamestown, Plymouth, and Williamsburg and in all three my STL model comes out looking not so interesting. Do you think my problem in choosing the spot? Or does it not play well with TinkerCAD? Or just user error in general?

1 reply

If the area you're looking at is small and there is not many vertical changes, yes it can look boring and blocky. Try a larger, steep area, just to check it is not the TinkerCAD export that is playing up.

This is a fantastic tutorial! My students will love it and get a much deeper understanding of topography by doing this. I've tried a few times, and I keep getting "mesh could not be imported" when bringing in the stl file into 123D Make. 123D Make has been working fine with other stl files that I have. Any thoughts?

3 replies

Hmm, strange. Does this happen with all sizes of map? Grabbing a very large piece of terrain leads to monster STLs that 123D Make might be balking at.

Thank you for your fast reply! I did use a 1080 box size, resulting in a 5.71 MB .stl file. I successfully imported a different stl file that was 23MB (was a tinkercad sourced file). I've tried on different computers and uninstalled and reinstalled 123DMake. I very much appreciate your thoughts.

odd. If a big TinkerCad file works, it might be something about the stl format 123D Make doesn't like. Perhaps try opening the stl in another program (Meshmixer I used to trim the Terrain2STL files) and resaving?

Note: 123D Make is very buggy - Autodesk stopped supporting it soon after launch, and its functionality is supposedly going to appear in Fusion360 in due course. I will update this project when it does.

Great work. Thanks. Do you know if there is something like 123DMake for Linux ?

2 replies

"Do you know if there is something like 123DMake for Linux ?"

I second

Not a Linux user, sorry. I imagine there are other tools out there for you, though perhaps not as user-friendly.

Makendo, my terain stl thing wont work and this is for a school project so yeah i was wondering if you could help me and ive been trying for 3days!

1 reply