French Build

Re: French Build

Postby Nicholas Seward » Tue Apr 22, 2014 8:36 pm

You can reach a large portion of a 31cm bed. The z height of parts on the edge will be small. Also, it is very tricky to print that big without the inaccuracies of the system preventing the first layer to be at the correct z location.
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Re: French Build

Postby GrahamHolt » Tue Apr 22, 2014 8:40 pm

I'm not sure, but I'm guessing that at the extreme limits of the arm reaches that the math that deals with the software leveling adjustments goes crazy and prevents accurate leveling calibration of the full 31cm area.

On the plus side, I was working off of the need to use a 20cm round mirror for this. That would translate to an 8" size which isn't easy to find. The 9" size will work much better and is much easier to source.
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Re: French Build

Postby secable » Tue Apr 22, 2014 8:51 pm

I was hoping to have something like this :
vue haut.jpg
vue haut.jpg (81.76 KiB) Viewed 8859 times


vue profil.jpg
vue profil.jpg (75.89 KiB) Viewed 8859 times


I don't need to have 3 about 30 cm of printing size. It's just to hide the heat bed.
But i can find a round silicone heating bed for not too expansive.
So maybe the best way is to buy a new heat bed.


If i make something with the normal basalt bed size in the BOM, what is the max Z size for printing ?
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Re: French Build

Postby Nicholas Seward » Tue Apr 22, 2014 11:51 pm

Max z is complicated. Mine is 175mm in the center it is more like 75mm around the edge. The hot end and bed thickness will change this a lot.
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Re: French Build

Postby GrahamHolt » Wed Apr 23, 2014 12:33 pm

@Nicholas,

OK, that's making more sense to me now. It sounds like this is a limitation of the arm geometry so that z-height would look like a roughly conicular solid with maybe a flattened off bit on the top where the z-height is maxed out.
In other words, if you printed out the whole build volume, it would kind of look like a cone from the side. From the top down I'm guessing it would look more like the shape of the basalt bed, but you mention it's complicated so there's no need to get into the details of this.
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Re: French Build

Postby Nicholas Seward » Wed Apr 23, 2014 2:07 pm

gus work volume.jpg
gus work volume.jpg (28.08 KiB) Viewed 8848 times


It is really the intersection of three spheres with chunks taken out around the shoulder mounts to avoid any singularities.
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Re: French Build

Postby secable » Wed Apr 23, 2014 4:40 pm

So if i understand, if i put a biggest bed, i will havr the same geometry printing, but more flat (less z heigh).

175 mm heigh is good. Less will be not enough maybe
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Re: French Build

Postby Nicholas Seward » Wed Apr 23, 2014 5:16 pm

The diameter of your bed doesn't change anything about the work volume. The height of the bed over the shoulder joints and the length of the extruder determine the max print height. Alternatively, you can make taller shoulders to get more z height. However, I tried to pick a design that keeps you well away from the singularity you get when the hub joints are level with the shoulder joints.

Also, even on my GUS with 175mm as the max Z, that is only for one point in the middle. The way I like people to think about it is that you can roughly print anything that can fit in a 200mm diameter by 125-150mm tall cylinder. You can print wider and you can print taller but the cylinder is easy to think about.
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Re: French Build

Postby secable » Wed Apr 23, 2014 6:57 pm

Ok thanks for details ;)
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Re: French Build

Postby secable » Thu Apr 24, 2014 6:09 pm

Nicholas, what speed can you reach for printing ?
The speedest but with quality.
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