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  • I found a couple of tiny-85 dev boards in my stash but have no idea what to do with them. They have a attiny 85 micro controller and a micro USB interface with six pads labeled 0-5. Would your boot loader and USB driver likely with with this board? It looks like a lilypad but with the USB and without the graphics. It is labeled with a phrase DIY MORE but their web site doesn't have any reference to this product.

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  • I wish I could make it... but something is missing.

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  • I just read this on a 3D printing for beginners blog, "it is important to know that a plastic cannot be recycled and re-extruded over and over again, as it becomes brittle and begins to exhibit structural problems if re-heated too many times. You will need to keep an eye on your plastics “heat history“, as each heat cycle further breaks the polymer chains which constitute your thermoplastic materials. It is therefore recommended that you always mix some new pellets or new plastic shredding among the old mixtures during extrusion, in order to maintain material strength." and "other recyclable polymers could also be used for extrusion. But this is where one needs to be very careful, as some plastic types like PVC or other chlorine based polymers can emit dangerous‚Ķ

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    I just read this on a 3D printing for beginners blog, "it is important to know that a plastic cannot be recycled and re-extruded over and over again, as it becomes brittle and begins to exhibit structural problems if re-heated too many times. You will need to keep an eye on your plastics “heat history“, as each heat cycle further breaks the polymer chains which constitute your thermoplastic materials. It is therefore recommended that you always mix some new pellets or new plastic shredding among the old mixtures during extrusion, in order to maintain material strength." and "other recyclable polymers could also be used for extrusion. But this is where one needs to be very careful, as some plastic types like PVC or other chlorine based polymers can emit dangerous fumes which can seriously endanger one’s health. If you are experimenting with waste plastic extrusion, you need to know what you are doing! Read your material safety data sheet if available!" I'm not a chemist so thinking about MSDS's , melting plastic and releasing harmful chemicals does not come natural. I know not to burn plastics... but just heating to soften... So here is my question, Is there an instructable that discusses the gotcha's and avoids of DIY reusing of plastic, specifically for 3D printing? Comments?Source of quote above: http://3dprintingforbeginners.com/how-to-make-diy-filament-for-your-3d-printer/

    You sound like someone who has experience with recycling and reusing. Can you help me wrap my brain around the big difference between grinding & recasting metal vs grinding & reusing failed 3D prints? Is the fact that metal is a basic material and plastic is a compound material the issue? When I 3D print something, is part of what makes plastic adhere layers together lost? I assume that's why the poster stated that we should use the recipe of 90% virgin plastic pellets and 10% failed 3D print plastic pellets. Is reusing failed 3D prints akin to using my old driveway as aggregate in the cement mixture I pour my new driveway with? I may have over explained my quandary but can you or maybe a passing maker help me out?

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  • Thank you for the details in your warning. I've always wondered where the mercury risk actually came from. I assumed the risk was in the powder contained in the bulbs. I can't count the number of times I've broken a CFL or tube mostly accidentally and mostly while installing or removing a bulb from an overhead fixture. I am going to have my kidney doc check my level of exposure on next visit.

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