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Another Hollow Cube

by NumberSix, published

Another Hollow Cube by NumberSix Sep 10, 2012
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Summary

Unable to remove the base using the OpenScad version of the 'hollow cube' (see ancestor) I went with what I knew and drew it out again in Sketchup. This is a 30mm cube with all hollow faces and 4mm square bars. As orionwnix said previously, it's great for many 3d printer tests including ooze/retraction, dimensional accuracy and squareness, and of course bridging!

Short video of this cube being printed on my blog, specifically the challenging bridging stage: http://numbersixreprap.blogspot.ie/2012/09/bridging-gaps-video-clip-included.html

Instructions

Download the .stl, slice and print. (that gives a 30mm/4mm hollow faced cube).
If you want to scale or modify in any way I've also shared the Sketchup file.

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hello - i was wondering also can you print this without supports? or do you print it and cut out the supports? OI am new to this and i thought that supports were necessary when bridging beyond a small a small gap.
thanks

No supports. It's a bridging test. You can use it to tune your bridging settings in your slicing software.

How do you print this? it has horizontal geometry which my printer would be unable to construct. did you use supports or are you printing in an anti-gravity environment?

Sep 1, 2014 - Modified Sep 1, 2014

Thanks for posting this. It's great for when people come over and I want to print something they can take home. This works out well since it prints quickly, doesn't take much plastic, and the bridging shows off a neat 3D printer trick.

You are very welcome! It's a neat demo print for sure.

"Unable to remove the base" DONT_KNOW

It only takes a minute to write a NEW VERSION:

side = 30;
borders = 4;

inside= side-2*borders;

translate([0,0,side/2])
difference () {
cube([side, side, side], true);
for(r = [[0,0,0],[90,0,0],[0,90,0]]) {
rotate(r)
cube([inside,inside,side+1], true);
}
}

Thanks Robert,

Now you're showing off! :)

I know you will find it hard to believe, but I would have struggled to figure that out, even with the original scad file hinting at it! It was far easier for me to approach it visually and draw it out. I understand the benefit of using OpenScad and how powerful, productive and flexible it can be, but for me it's got a much steeper learning curve and is more difficult to retain. Minds work in different ways I suppose. I'm happier in the graphical interface, but I won't give up on OpenScad yet. You have encouraged me to have another go! Thanks for sharing the neat code.

There are many things that OpenSCAD is not good at but it was made for this kind of model. I find it easier to make parametric objects that can easily be changed by the user by changing the parameters (variables).

SketchUp is a very powerful tool and I have used it to make some complex shapes, but my first tool of choice is always OpenSCAD.

Take a look at http://www.thingiverse.com/thing:20963http://www.thingiverse.com/thi... to see what can be done easily with OpenSCAD.

Parametric LOGO Smart Phone Stand

Nice, like the hollow bottom and the surprise in the sketchup file.

How fast are you bridging? I noticed last week that Slic3r (0.9.1) still prints the perimeter of a bridge at top speed, then it slows down to bridge speeds for the infill strands.
So I'm not sure if flow reduction helps for me? may depend on how fast you are printing, if anything when it does the
perimeter bridge I was wondering if it needed more flow, I get snapping some times at speed. Usually have normal flow for the infill strands.

Hi Rich,

I'm using Slic3r (0.9.1) at the moment also. My Bridge speed and other speeds were all set the same for this exercise (25mm/s), so that's why I didn't observe any speed difference between the bridge perimeter and the rest of the bridging process. Since I had been keeping an eye on this print job I was using the handy Manual "Speed Multiply" Slider in Repetier-host to vary the speed of the print depending what stage it was at. I sometimes do that, push it a little if I think it can take it, then slow it down with the slider if it is getting to a tricky bit. (not very scientific I know! :) )

It probably would be better if all bridging (perimeter included) was done all at the same speed, then you would know if bridging flow rate change was making a difference or not.

If trying to bridge at speed I could see how you might do better with increased flow and some fan cooling to tighten t
he string up into place.

Did I leave a second cube in the Sketchup file?? oops.. I was experimenting with interlocking cubes, but it's as much a support challenge as a bridging one! :) Can't quite figure how to get support under only one of the cubes, the mid-air one. If I switch on support it insi
sts on putting supports under the upper struts of both cubes, and I don't want that, just support under the base of the suspended cube!

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