Printed at 2x scale to keep the grid printable. You will want z-axis lift on retract and force retraction everywhere you can in order to keep neighboring beads from fusing during travel moves.
plz help make this step by step thanks
Use my updated version, which is (a little bit) faster than the original: http://www.thingiverse.com/thing:310541
Open it up in Customizer, and click "Choose File" to upload your image. You may want to resize your image to 20x20 beforehand, and render it to black and white first, in order to get the best control over the result. Click the "invert colors" button. Scroll down and select the "Panel Shape" if you don't want the result to be a circle.
Go back to the "Mode" setting at the top and select "Compile" before you click on Create Thing. Then wait until it emails you that it has finished.
If you want a larger version, you will need to download the OpenSCAD file and use the image array tool to generate the data, and run OpenSCAD on your computer locally. If you use a development version, it will be astonishingly faster than Thingiverse's customizer, and you can do much larger versions.
Give the above a go, and if you get stuck, try me again.
I had considered that and tried it prior to you responding actually; reducing pixel size to .6 (so the sum should be .9), it's still rendering, so I'll let you know if it worked when it's done. after re-reading JSC's post I decided to try reducing the pixel size. I've got my fingers crossed. thanks!
I just tried this, it was rendering overnight (60x60 grid)
I went to export as an stl and it refuses to do so, says the object is non-manifold.
any idea on what I did wrong?
I found the issue. Well, one issue, anyway.
If pixel_size and grid_size together are exactly 1, then two neighboring beads can just touch, making it non-manifold. The quick solution is to modify grid_size or pixel_size so that their sum is not 1. The default is 0.3 and 0.7.
I had considered that and tried it prior to you responding actually; reducing pixel size to .6 (so the sum should be .9), it's still rendering, so I'll let you know if it worked when it's done. after re-reading some other comments on the project in general, I decided to try reducing the pixel size. I've got my fingers crossed. thanks!
any luck on this? my gerts to 984/1000 and stalls when trying to build a 40x40 grid
Yes, It did render, like he said, make sure grid and pixel size aren't equal to 1. it definitely solved the problem. Just realize that the bigger your grid, the longer it will take to render and export.
Compiles tend to go quickly though, so you can always just compile it for a preview; then, if it looks satisfactory, you can render and export once done.
50x50 grid took a little over six hours to render, and maybe 15-30 minutes to export the rendered file to STL on my PC (this was on a quad core AMD machine under Win7) Those last 20 are what takes forever with this.
Make sure grid_size and pixel_size don't add up to 1.0. Other than that, it takes forever to compile, just let it sit. It will stall at 99% for many hours.
Make sure you export to STL before quitting OpenSCAD or you will lose all the work!
awesome, but, how did you expand the grid with so many pixels?
Used the OpenSCAD file and modified it on my computer. Follow the instructions for the Thing to do it yourself without using the Customizer. It takes a long time to compile, so let it run overnight.
6 hours to compile 50x50.