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3Dprinting A River

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Gauntlet writes:

I've also designed river sections for 3d printing smaller scales 6mm-10mm. I use a height map to generate natural looking features.

Your idea of having separate banks and water pieces is something I hadn't thought of. Interesting.

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12 March 2017page first published

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Personal logo Editor in Chief Bill The Editor of TMP Fezian writes:

I've been monkeying around with a parametric 3D model to make river sections on a 3Dprinter. I'm not done with the model, but I have put together a prototype.

The model produces results for rivers and banks as separate pieces, so a complete river is three pieces: left bank, river, right bank. This allows the parts to be printed in different materials, and allows you to have a wider river than if it was a one-piece model.

The major limitation is that the pieces cannot be longer than your 3Dprinter's print area (which, for me, is about 6 inches in length).

Here's the river model output – it's just a box, two inches by five inches, .125" thick:

River model

And here's a bank piece, which is designed to fit over the river piece:

Bank model

I chose to orient the models so that they were standing vertically in the printer. I printed the river banks in green plastic, and the river itself in transparent blue:

3Dprinted model

I suppose you could use the pieces straight from the printer, but I decided to paint and flock the bank pieces, and to apply some gloss coats to the river. I painted the banks a dirt brown color, and the bottoms black. No primer needed, but it takes two to three coats – I paint with the striations first to make sure the paint gets into those crevices, then across the striations while the paint is still wet. Then I sealed with flat spray. For the river, I used about ten fast-drying coats of gloss Mod Podge.

Basecoated 3Dprinted model

I then applied glue to the banks and flocked them, afterward sealing them again. Then I superglued everything together:

Finished 3Dprinted model

And here it is with a familiar figure to give you a sense of size:

Finished 3Dprinted model with GW Grey Knight

Based on the prototype, I've decided to revise the bank pieces when I work on the model next – figures get 'too tippy' on round banks, and making a curved bank piece uses too many triangles when it's round in two dimensions…