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…..................................................... .--- Tunnel Portals Pt. 1 ---

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I have a number of tunnels planned for the layout and need portals for them so have spent a little free time when I'm not working on the layout designing some with Fusion 360 and printing them on the Ender 3 Pro filament printer. I print on standard quality so they could be a little sharper if I used the highest quality print option.

The ones above were designed with UP tunnel portals along the Price River as inspiration. They aren't designed off of actual dimensions. I'm just going for a look I'm comfortable with for most things on the layout. Their portals in that area are like the bottom left one above and are concrete and fairly plain. To add some variety I've used a random stone pattern for another version and also have designs with and without the date built plaque (theirs have the date plaque).

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West Moffet Tunnel portal above.

I messed around a little trying to show the cracks you can see in the photo without much luck. I'll probably go back and start over from scratch painting the portal and try something different.

I might go back to this portal at a later date as I'm not totally happy with it. I'll probably only use two of these portals on the layout so might just print one more and be done with it. I'm going to put the print files up for the ones I've designed and will design at some point but haven't done so at the time of writing this (23-02-10).

UPDATE: So I said above I'd put this aside for a while but it was bugging me to much so worked up version 3 ….

….. shown above. Using Fusion 360 it didn't take long to narrow up the front walls and reproportion the tops of them and the top in general. I'm much happier with this and will now print another one and leave it alone.

Since this tunnel was such a huge multiyear project (6+ miles long) I think they overemphasized elements of the portal to show off a little.

In the picture above I didn't quite line up the front and back pieces. I'm printing them separately to cut down on materials and print time. You can also not print the back if you want and push the front up against the rock wall.

It just takes a few minutes to glue the 2 parts together and file/sand the glue line down. I'll paint this and print a second and maybe also expand it to a double track portal even though there wasn't one.

If you have an interesting portal that you like consider posting it on one of the forums I frequent or send me a picture or link. If it is something I might want to use I'll try designing it and if I feel OK about the outcome I'll post the print files.

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Print files are up for the above single track portals on thingiverse.com:

UP Style ( HERE )

Stepped Top ( HERE )

Stone Arch ( HERE )

Moffat Tunnel Portal ( HERE )

If you came into the build here you can find the main index for the build ( HERE ).

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