SLA /MSLA 3D printing with an Elegoo Mars Ultra - with a model making inclination

[Peter Gillson]

Hi gary

i am starting to appreciate just how little I know so I hope you do not mind me summerising my understanding so you can point put where i am wrong!!

there are theee elements to this:


1 - the design process, using a CAD program for 'hard' edge shapes, or sculptng programs such as Nomad sculpt for more organic shapes
2 - asplitter program t prepare the design for printing
3 - printing, either resin or filiment

peter

[David Lovell]

Keep it all comming ive no intention of ever 3d printing god I struggle with rhe mobile phone this has all gone straight over the bald patch ,but because one knows its out there and is partly the future of our hobby I find it really interesting reading thanks all who are contributing to this. Dave

[Jim R]

Like Dave I'll almost certainly never enter the world of 3D printing but I recognise it's place in the future of the hobby. It's interesting to see your progress.

[Gary MacKenzie]

Hi gary

i am starting to appreciate just how little I know so I hope you do not mind me summerising my understanding so you can point put where i am wrong!!

there are theee elements to this:


1 - the design process, using a CAD program for 'hard' edge shapes, or sculptng programs such as Nomad sculpt for more organic shapes
2 - asplitter program t prepare the design for printing
3 - printing, either resin or filiment

peter

yes , thats the basic idea if you start from scratch.
However,
there are now thousands of good model files out there that you can get free , cheaply , or like many model kits , expensive , and print on your own printer.

e.g.

https://cults3d.com/en/3d-model/various/mash-ambulance-1-32-scale-model-kit

25.00 euro

[Gary MacKenzie]

Why i get annoyed with software and logic.


Cab roof and window design

But add the code to the body code and you get this.



i now need to work out why this happens , or maybe stick to doing the designs for each bit in a seperate file.

Update , my fault , i thought I had removed a bit of code , i hadn't ....... logic is working , so on the right tracks

need to see if I can assign colours to each section , will spot problems quicker , eyesight isn't up to this until I get new glasses




//main box
color("red")
difference() {
cube([56,82,60]);

translate([1,1,0]) cube([54,80,59]);
translate([10.5,0,0]) cube([35,40,40]);
translate([-5,20,25]) cube([25,41,15]);
$fn=100;
translate([28,41,55]) cylinder(h=20,r=15);
}
//runners
color ("green")
difference() {
translate([0,0,20]) cube([3,80,3]);
translate ([0,0,21]) cube ([2,80,2]);
}
color ("green")
difference() {
translate([0,0,47]) cube([3,80,3]);
translate ([0,0,47]) cube ([2,80,2]);
}
difference() {
$fn=360;
translate([28,41,58]) cylinder(h=3,r=17);
translate([28,41,55]) cylinder(h=40,r=13);
}
//cab


CubePoints1 = [
[ 0, 82, 22 ], //0
[ 56, 82, 22], //1
[ 48, 112, 22 ], //2
[ 8, 112, 22 ], //3
[ 0, 82, 23 ], //4
[ 56, 82, 23 ], //5
[48,112,23 ], //6
[8,112,23 ]]; //7

CubeFaces1 = [
[0,1,2,3], // bottom
[4,5,1,0], // front
[7,6,5,4], // top
[5,6,2,1], // right
[6,7,3,2], // back
[7,4,0,3]]; // left

color ("purple")
polyhedron( CubePoints1, CubeFaces1 );

difference() {

CubePoints2 = [
[ 8, 111, 4 ], //0
[ 48, 111, 4], //1
[ 48, 112, 4 ], //2
[ 8, 112, 4 ], //3
[ 8, 111, 23 ], //4
[ 48, 111, 23 ], //5
[48,112,23 ], //6
[8,112,23 ]]; //7

CubeFaces2 = [
[0,1,2,3], // bottom
[4,5,1,0], // front
[7,6,5,4], // top
[5,6,2,1], // right
[6,7,3,2], // back
[7,4,0,3]]; // left
color ("purple")
polyhedron( CubePoints2, CubeFaces2 );

color ("yellow")
translate ([13,85,9]) cube ([30,30,8]);
}

[scottie3158]

Gary,
How long have you been speaking Latin lol, I wouldn't know where to start.

[Gary MacKenzie]

Gary,
How long have you been speaking Latin lol, I wouldn't know where to start.

Neither did I 48 hours ago

[Peter Gillson]

hi Gary

Thanks for the reply, and confirming my limited understanding is ok

Am I also right in thinking that 3d sculpting software does not work in terms of scales or cm measurements but rather in terms of units which are then sized to a scale by the printing software, so the same file can be used to print the same model in multiple scales?

I amthinking of using Nomad sculpt to sculpt some highly detailed medals (such as the order of the bath), and then having them printed by a local company in 1/10 scale to use on the master of a bust I am working on .

being only a couple of mm thick they should not be expensive - does this sound plausable?
'

[Gary MacKenzie]

Very plausible.
Most software allows you to choose a scale, so you could choose to tell it that the diameter of the medal is 3" , but that can be any size on screen with as many ''pixels'' as you want , however you will be limited when it comes to printing as to resolution of a printer , although some of the new metal printers can do silly levels of detail ( airplane turbine blades etc with very tight tolerances )
I haven't tried nomad sculpt , but many have.

I like this guy and he usually shoots from the hip, so he will call out problems.

[Peter Gillson]

Very plausible.
Most software allows you to choose a scale, so you could choose to tell it that the diameter of the medal is 3" , but that can be any size on screen with as many ''pixels'' as you want , however you will be limited when it comes to printing as to resolution of a printer , although some of the new metal printers can do silly levels of detail ( airplane turbine blades etc with very tight tolerances )
I haven't tried nomad sculpt , but many have.

I like this guy and he usually shoots from the hip, so he will call out problems.

Will watch the video with interest - many thanks.

when i'm back in - guernsey I'll find out about the printer Just Tec have.

[Gary MacKenzie]

Been messing with ''tinkercad'' too , which is more visual program, but aparently uses different logic.

With openscad each command is processed , then the next , in order you have them on the program list
so moving a piece up or down the list alters how it interacts with other pieces

In tinkercad for example , a hole overrides everything else, no matter when you added or deleted a piece, unless I am missing a way to lock pieces so that other things don't interact with them.

Now down the youtube rabbit hole watching tinkercad videos

Ok , different logic , a "group" is the solution , group two or more pieces including hole , and it becomes 1 logical piece so that hole in it doesn't affect other pieces.

[wotan]

Like many I will probably never get into 3D printing, at least at home. I do use 3D software though and my choice is Blender. Now this is much more than a 3D drawing program since it can produce things up to full movie quality CGI, with animation etc etc. If I ever decide to try to print something I will probably send one of my files out to a printing service to get the smelly bits done.

John

[Gary MacKenzie]

Like many I will probably never get into 3D printing, at least at home. I do use 3D software though and my choice is Blender. Now this is much more than a 3D drawing program since it can produce things up to full movie quality CGI, with animation etc etc. If I ever decide to try to print something I will probably send one of my files out to a printing service to get the smelly bits done.

John

If you can handle blender you are streets ahead of me.
I tried blender very early on and lightwave back in the days of an amiga2000 and the theory was good, but my practical abilities, not so much.
I'm messing with software because the delivery company ''evri'' have managed to misplace the heater I orderred to keep the resin at a sensible heat for printing .......



It is still ''delayed'' so two days later isn't next working day.

[Gary MacKenzie]

The parcel finally arrived.
No explanation of where it's been for 10 days.
Plugged the heater in ......... its as much use as a chocolate fireguard. Didn't raise temp by 1 degree in 90 minutes ( I need at least 15 degree increase.

To make sure it wasn't me having a bad time , I put a old style 60w lamp ( same wattage as the small heater ) into the same space and in less than 60 minutes the temp was up 3 Degrees.

So , need to rethink the heating idea.

Until I can keep enclosure at approx 25 degrees , I can't really do anything and the 10 day delivery really slowed me down.

[Dave Ward]

Gary,
you show amazing patience! If it had been me I'd have had a play with this already ( and found out why you have to have a 25C enclosure )......................
Dave