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Post by scotttucker on Mar 5, 2023 13:56:59 GMT -7
Another experiment - instead of scaling the perforations, I had a go at printing the plate with uniform 0.4mm holes - the idea being to use the plate to hold the ends of very fine fibre optics in position (0.05mm dia) and control magnitude by differential lighting at the 'source' end of the fibres. As you can see - at 0.4mm my printer coped with most of the holes but when closely spaced, they coalesce into blobs. Quite surprised by the variation in supposedly uniform hole size. Although imperfect (due to printer fidelity), I am quite excited that I can transfer properly calculated star maps into printable files - perhaps the next step is to investigate laser engravers/cutters. The second picture shows the comparison between a graphical plot on the left and the actual plate on the right - still a few holes closed over, but not too bad.
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Post by Ron Walker on Mar 6, 2023 9:48:06 GMT -7
Mr. Spitz would be so happy if he had a 3D printer when he first started.
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Post by markspoelstra on Mar 6, 2023 13:31:53 GMT -7
I assume you're nozzle is 0.25mm ?
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Post by scotttucker on Mar 7, 2023 10:14:11 GMT -7
Aaaah- good point. I was using a 0.4mm nozzle. I will order a 0.25 and see if it makes a difference.
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Post by Ron Walker on Mar 8, 2023 9:06:47 GMT -7
I would imagine print time would double. Would you need a hotter tip temperature?
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Post by markspoelstra on Mar 8, 2023 9:20:41 GMT -7
Sure, printing times are longer indeed. Temperature is same.
I also rendered the starball at the full 8911 stars and created the stl.
It is now printing just a part, just to see what happens. I will be back when something usefull is on the printerplate. Not sure if I will let it go for the complete 34 hours it is going to last on my Prusa ;-)
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Post by markspoelstra on Mar 8, 2023 16:12:22 GMT -7
Hi Scott, It really interests me how you have thought to finish this. Attached a photo of my print so far. This is with my Prusa, and with a nozzle 0.25mm (PLA material). So far it looks like all the star-holes are free. But, how the.. "beep"... you think you can print the complete ball To enable supports is not possible I guess (especially not inside) I am very interested and following you're project! Mark
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Post by markspoelstra on Mar 9, 2023 7:28:57 GMT -7
Hi Scott, Just for you're information. This is the result in PLA with a 0.25 nozzle. I was just curious how it would come out. some holes close to each other become one though
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Post by Ron Walker on Mar 9, 2023 10:45:47 GMT -7
Courious as to what the diameter of the star ball would be if complete and then the size of the holes for the various magnitudes. They seem quite large in the picture.
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Post by markspoelstra on Mar 9, 2023 11:58:45 GMT -7
Hi Ron,
I just did everything one on one. So the diameter is/would be 200 milimeters.
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Post by markspoelstra on Mar 9, 2023 12:56:47 GMT -7
Only now I read better and see that you printed the ball at 100mm Scott? Hmm, could try that also... But I would love also to play/experiment with fibers. I already used these in my little Zeiss IV model But, they are 0.7 and 1.0 mm diameter. You talk about 0.05mm Scott? I Google and Google and Google, I cannot find such things. Where do you get that? Best regards Mark
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Post by scotttucker on Mar 10, 2023 0:25:53 GMT -7
Courious as to what the diameter of the star ball would be if complete and then the size of the holes for the various magnitudes. They seem quite large in the picture. Hi Ron - the beauty of the OpenSCAD script is you can easily redifine the hole sizes (and the sphere size too although you can easily apply a scaling factor at the 3d printer slicer software stage). I printed a hemisphere as a test at the defaut hole size - and yes, they are quite large.
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Post by scotttucker on Mar 10, 2023 0:48:20 GMT -7
Hi Scott, It really interests me how you have thought to finish this. Attached a photo of my print so far. This is with my Prusa, and with a nozzle 0.25mm (PLA material). So far it looks like all the star-holes are free. But, how the.. "beep"... you think you can print the complete ball To enable supports is not possible I guess (especially not inside) I am very interested and following you're project! Mark Hi Mark - I did a test print but for a hemisphere only. It is self supporting during the print with no support structure needed at all. Pictured here next to a Spitz Junior for comparison. The default hole sizes are a little bigger than the Spitz but that is easily amended. Scott
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Post by scotttucker on Mar 10, 2023 0:55:24 GMT -7
In the meantime I have printed out the model dodecahedron - no support needed, bottom hexagon will be printed separately and used to mount the light. Has 750 stars ranging from 0.7-0.2mm. Using a mini maglight bulb you can project with it (it is not great), but it will look good as an illuminated model I think (picture is very shakey).
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Post by scotttucker on Mar 10, 2023 1:02:38 GMT -7
Only now I read better and see that you printed the ball at 100mm Scott? Hmm, could try that also... But I would love also to play/experiment with fibers. I already used these in my little Zeiss IV model View AttachmentBut, they are 0.7 and 1.0 mm diameter. You talk about 0.05mm Scott? I Google and Google and Google, I cannot find such things. Where do you get that? Best regards Mark Hi Mark - You can get 0.05mm fibre optics from www.surplusshed.com/index.php This is one of my all time favourite websites- fantastic for lenses and lots of good junk. The only problem (for us) is that being located in Pennsylvania the postage costs to Europe mean you sort of need to make sure your order is worth it. The very fine fibre optics are extremely fiddly to handle. I did some experiments a few years ago around using the 0.05mm fibres for all the stars on a plate and controlling magnitude by aligning the 'bulb end' of the fibres so that some were brighter than others - this method produces (in my opinion) very beautiful projected stars but it was incredibly delicate and difficult to handle. I think that 3D printing fibre guiding jigs will make the approach more doable.
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