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Author Topic: Printed Sandbag Walls  (Read 331 times)

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Offline colpatben

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Printed Sandbag Walls
« on: July 13, 2019, 01:56:09 PM »
Post_01 13th July 2019

The Bexhill West to Crowhurst layout is set in the early years of WWII and as such many of the structures need to be surrounded by sandbag walls.

A Sand bag is nominally 18in. * 36 in. * 6in. Scale 3mm * 6mm * 1mm if filled.

This picture has the caption100,000 sandbags!



Q. Is a sandbag wall something that could be 3D printed? Not an individual sand bag but a complete section of fronts, sides and tops to suit each location.

If this was viable then where should I start?

I know I will need to do a 3D design with a 3D design software, and I do have a limited knowledge oaf AutoCad 2D so CAD software is not a complete mystery.

Would a Wanhao Duplicator I3 Plus MK2 do the job bearing in mind the dimension of an individual bag?


Colin.
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Offline Railwaygun

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Re: Printed Sandbag Walls
« Reply #1 on: July 13, 2019, 09:46:10 PM »
have you considered coating a piece of foam board with PVA then milliput or plaster

you could carve a section of sandbags, and make a rubber master to cast more sections??

Not 3d printing, but cheaper than a printer!

a real expert will be along RSN

ps ask in 10mm wargames forums as well

http://www.pendrakenforum.co.uk/index.php?topic=7385.0

some ideas

https://tinyurl.com/yy6k38h2


« Last Edit: July 13, 2019, 09:55:41 PM by Railwaygun »
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Offline colpatben

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Re: Printed Sandbag Walls
« Reply #2 on: July 17, 2019, 08:19:54 AM »

a real expert will be along RSN

Thanks for the links, but I would actually like to try 3D printing.

Where are these Experts? Perhaps they are on holiday!  8)

@Only Me
@Snowwolflair

And I read somewhere that @Delboy has one of these Wanhao printers. What is your opinion for a first time user?
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Online Snowwolflair

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Re: Printed Sandbag Walls
« Reply #3 on: July 17, 2019, 09:10:19 AM »

a real expert will be along RSN

Thanks for the links, but I would actually like to try 3D printing.

Where are these Experts? Perhaps they are on holiday!  8)

@Only Me
@Snowwolflair

And I read somewhere that @Delboy has one of these Wanhao printers. What is your opinion for a first time user?

the printing is the easy bit, generating the CAD is much harder.  Here are some examples from Thingverse which you could adapt.

https://www.thingiverse.com/search?q=sandbag&dwh=145d2ed76edcc2d

Offline colpatben

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Re: Printed Sandbag Walls
« Reply #4 on: July 17, 2019, 09:31:15 AM »

the printing is the easy bit, generating the CAD is much harder.  Here are some examples from Thingverse which you could adapt.

 

Thanks for the reply.

I have started to learn?
Using Windows 3D builder I took a sack image from their samples



Shrank it to 6mm * 3mm * 2mm and built a simple single height sample wall.



Is this a good way to progress or are there better ‘Free’ programs to use for Windows 10 ?
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Offline Bealman

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Re: Printed Sandbag Walls
« Reply #5 on: July 17, 2019, 10:22:19 AM »
Great stuff, and maybe marketable!  :thumbsup:

The product could be sliced with a craft knife into required pieces.

However, for a one-off, I'd be going the home made carved version, the detail being probably not noticeable in N.
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Offline Only Me

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Re: Printed Sandbag Walls
« Reply #6 on: July 17, 2019, 11:34:34 AM »
Hi im not sure how I missed that post, windows 3d is probably not what you want to use as it doesnt create meshes very well and your prints will come out a but of a mess.... try autodesk fusion 360 (free to hobbyists)..... as for printing on a wanhao, that small size may work but depends on if youve dialed your printer in and done all the modifications such as firmware update, lcd update added the z axis sway bars and a glass basilicate bed... micro swiss hot end and 0.4mm nozzle..

I did those mods to my Wanhao and it turned an ok printer into an excellent one....then moved onto resin with a Photon printer instead

So start with a flat base maybe 2mm thickness in the shape of the item you want then add the bags to it and embed them in it so you get a flat back and good build plate adhesion but the end result will look like all the bags in one as the idea is to print as one complete item
« Last Edit: July 17, 2019, 11:38:15 AM by Only Me »



Offline Bealman

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Re: Printed Sandbag Walls
« Reply #7 on: July 17, 2019, 11:42:50 AM »
Still think the simple way out is a homemade representation  :beers:
Vision over visibility. Bono, U2.

Offline colpatben

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Re: Printed Sandbag Walls
« Reply #8 on: July 17, 2019, 05:31:40 PM »
Try autodesk fusion 360 (free to hobbyists)....

I did sign up for Fusion but dipped out initially as I am overly suspicious of Web Based software, but I will get it up and running and give it a try.

Quote

as for printing on a wanhao, that small size may work but depends on if you’ve dialed your printer in and done all the modifications such as firmware update, lcd update added the z axis sway bars and a glass basilicate bed... micro swiss hot end and 0.4mm nozzle..

Now I got lost at ‘Dialed your printer in’ and then it went over my head, more reading and asking questions :confused1:.

Quote

I did those mods to my Wanhao and it turned an ok printer into an excellent one....then moved onto resin with a Photon printer instead.

Happy to start with a simple printer.

Quote

So start with a flat base maybe 2mm thickness in the shape of the item you want then add the bags to it and embed them in it so you get a flat back and good build plate adhesion but the end result will look like all the bags in one as the idea is to print as one complete item

I’ll have to address that as I become conversant with the software.
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Offline colpatben

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Re: Printed Sandbag Walls
« Reply #9 on: July 20, 2019, 04:45:55 PM »

I did sign up for Fusion but dipped out initially as I am overly suspicious of Web Based software, but I will get it up and running and give it a try.



Got Fusion360  up and running.

Need some time to get to grips with it  :computerangry:

I will return when I have made some progress  :thumbsup:
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Offline Railwaygun

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Re: Printed Sandbag Walls
« Reply #10 on: August 01, 2019, 12:50:16 PM »
This has been a public service announcement
It may contain alternative facts

Caveat lector

The largest Railwaygun, Armoured Train & Military Rail group in the world!
https://groups.io/g/railwaygun/topics

My Military Rail Pinterest area
https://uk.pinterest.com/NDRobotnik/

10mm / N armour Threads
https://www.10mm-wargaming.com/

Motto: Semper ubi, sub ubi

 

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