Thin walls multiplier (or other solutions for this problem)  

RE: Thin walls multiplier (or other solutions for this problem)

Can you post the STL for just the I-beam?  I will try to print it.  

RE: Thin walls multiplier (or other solutions for this problem)

Hello @cwbullet,

can I send you the STL via PM? I don't want to post the model public because its work related.

Out of reasons I don't know I cannot write you a message, so maybe if you write me a PM first I can answer to that.

Best regards,

Josh

RE: Thin walls multiplier (or other solutions for this problem)

You cant send a pm as your account doesn't have enough posts.  Post some more and the limit is lifted.

Don't send the whole file just cut out one of the ibeam sections and save that as a project (file>Save As in PS) and attach it here.  Anyone of us can create an ibeam in CAD but its the exact size you are using along with your settings (as stored in the project) that we would need to recreate the issue.  No one is going to 'steal' an elementary primitive like an ibeam so the small section shouldn't be a problem with a proprietary model.

Don't forget to zip the project up or the forum wont accept it.

RE: Thin walls multiplier (or other solutions for this problem)

Go ahead, and I will try to print it.  

Posted by: @kame-jw

Hello @cwbullet,

can I send you the STL via PM? I don't want to post the model public because its work related.

Out of reasons I don't know I cannot write you a message, so maybe if you write me a PM first I can answer to that.

Best regards,

Josh

RE: Thin walls multiplier (or other solutions for this problem)

Finally figured it out how to do it. Here is the STL and the size i want to print it.

Hope someone can help me.

Motorständer.zip

RE: Thin walls multiplier (or other solutions for this problem)

One problem (and its a big one) is that the ibeam at its thinnest point is only 0.18mm thick.  You are trying to print that with a 0.4mm nozzle presumably.  Even with arachne thats going to be VERY difficult to print.  Its just too small for the nozzle size to cope with.

As its printing the layers above they are most likely melting the already printed ones below due to the heat transfer.  Eventually they collapse like a house of cards.  That would tally with your pictures above.

You need to either fit a smaller nozzle (but even a 0.25 is still going to have issues with a 0.18mm part).  Apply an xy compensation to make all your perimeters bigger (which will work if it doesn't have to structurally fit with another part), or move to something like a resin printer that can handle the resolution you seem to need.

While I can barely print the ibeam cross section on its own, its a thin strand and the stringing was terrible.  As it is designed with the whole model where its structurally supporting areas above (that will need support adding for them to print anyway) then when you remove the needed support it will, unless you are extremely careful, end up breaking the model when its removed.  Even if you succeeded in that it will always be a very fragile model.

Here is the ibeams with a 0.2mm XY compensation.  Remember this means its making that thin middle part of the ibeam 0.58 instead of 0.18.  It also has arachne doing its variable extrusion thing too.  It looks a lot better that then first one , even if the stringing still needs adjusting. 

RE: Thin walls multiplier (or other solutions for this problem)

Hello Neophyl,

that is looking great. Just as i wanted it. The model is just an eyecatcher so it doesn't have to fit one in another so that works for me.

Does the xy compensation add the value to every object or only those that are too thin?

RE: Thin walls multiplier (or other solutions for this problem)

XY Compensation adds to all XY Dimensions.

RE: Thin walls multiplier (or other solutions for this problem)

So it seems that multicolor prints do not support xy compensation.

But as Neophyl showed, it prints the I-beam just as i imagined in one "go around" the outer contour.

That would be a usefull addition to prusa slicer to set xy compensation to just thin walls.

RE: Thin walls multiplier (or other solutions for this problem)

That would be a usefull addition to prusa slicer to set xy compensation to just thin walls.

I'm not necessarily arguing against this idea but obviously there comes a point when it becomes the designer's responsibility to ensure their model is actually printable. I'd much rather Prusa engineers focus on fixing issues with Arachne and seam placement (hey, how about straight-line painting at last?) and other new features than dealing with edge cases caused by flawed designs.

RE: Thin walls multiplier (or other solutions for this problem)

Hello fuchsr,

the thing is, that this is a machine we engineered for a customer and I want to print it as a eyecatcher as giveaway. That is the reason I dont want to put extra time into remodelling the I-beams. I want to export the machine as stl, import it in PS, scale it down to maximum printable size, do some finishing touches with colors and print it. This is no functioning or moving model, just a scale model of the machine.

Best regards,

J

...but you are in danger of demonstrating to your customer that you don't pay attention to fundamentals and prioritise style over substance ... is this the message you want to send?

Cheerio,

RE: Thin walls multiplier (or other solutions for this problem)

Hi Diem,

I think you are missing something here. Just for clarification. The model is a machine for the steel industry. The model i want to print is scaled down to the size it's possible to print it as whole.

It should be a gift for the customer as scale model of the real size machine.

J

I think you are missing something here. Just for clarification. The model is a machine for the steel industry. The model i want to print is scaled down to the size it's possible to print it as whole.

 

It should be a gift for the customer as scale model of the real size machine.

Unless it is of astonishingly high quality I would advise against.  The only exception is if it is a decorative finish for another item - eg a card or desktop stationery box disguised to look like a rolling mill.  Even then it MUST be sturdy enough to function in its desktop role.

Cheerio,

J

RE: Thin walls multiplier (or other solutions for this problem)

Posted by: @diem

 

I think you are missing something here. Just for clarification. The model is a machine for the steel industry. The model i want to print is scaled down to the size it's possible to print it as whole.

 

It should be a gift for the customer as scale model of the real size machine.

 

Unless it is of astonishingly high quality I would advise against.  The only exception is if it is a decorative finish for another item - eg a card or desktop stationery box disguised to look like a rolling mill.  Even then it MUST be sturdy enough to function in its desktop role.

Cheerio,

J

 

 

and to be sturdy enough and that I dont have to rework the downsized model to have no thin walls I would need this "thin walls multiplier".

Just rework it. It's so thin that it isn't really there.   The slicer isn't intended to be a fix for sloppy CAD.  You're printing this for engineers, they notice this sort of thing.

Cheerio,

RE: Thin walls multiplier (or other solutions for this problem)

I dont have the time to rework it. Thats why I'm asking for a "thin walls multiplier". Thats the whole point my friend.

?? Surely it's just a parametric edit in the cad.

Cheerio,

RE:

Posted by: @diem

?? Surely it's just a parametric edit in the cad.

Cheerio,

Actually it's not that easy and requires time to change standard I-beams in our CAD. And because of the time factor I was asking for this setting where you i.e. just have to set a factor for "multiply thin walls by the factor x".

That would be way less time consuming for someone who just wants to print out a model of a real life machine. And by the way, the coloring of the machine takes lots of time already.

So I hope you can understand my point of view and why I am asking for this upgrade.