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pdelorey

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  • Hi there - I used epoxy resin as it suffers less from inhibition than polyester or urethane resins. I purchased mine at West Marine and bought the slowest curing formulation available to give me the most flexibility in working time as I had never attempted this before. Best of luck!

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  • Hi Jon - I don't honestly recall if they were an Omax product or third-party. Maybe ping @OMAXCorp like below in the comments? Best of luck!

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  • Thanks for the kind words!As for the coal, I bought a small package of anthracite nuggets from here: http://www.buycoalonline.com/For grinding, I can speak only to achieving the grind size that I settled on - think coffee ground for a french press or perhaps just slightly coarser. Like I mentioned in the Instructable, I used a two-stage process - breaking up the nuggets first with a sledge to create smaller pellets. I ended up using a Magic Bullet blender and think that the small-ish size of the working amount gave me good control over the consistency of the batch. If you're looking for true dust, I would think that the ball mill is the way to go. Perhaps a try a cheap coffee grinder as well once the pieces are small enough just to try another method?As for safety, please take my words as…

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    Thanks for the kind words!As for the coal, I bought a small package of anthracite nuggets from here: http://www.buycoalonline.com/For grinding, I can speak only to achieving the grind size that I settled on - think coffee ground for a french press or perhaps just slightly coarser. Like I mentioned in the Instructable, I used a two-stage process - breaking up the nuggets first with a sledge to create smaller pellets. I ended up using a Magic Bullet blender and think that the small-ish size of the working amount gave me good control over the consistency of the batch. If you're looking for true dust, I would think that the ball mill is the way to go. Perhaps a try a cheap coffee grinder as well once the pieces are small enough just to try another method?As for safety, please take my words as common sense guidelines only, and be sure to ALWAYS use proper protective equipment. Unfortunately, I have no informational resources other than myself to offer, and I'm in no way an expert on processing coal. As you already know from the Wiki page you cite, explosions happen when airborne dust exceeds the minimum concentration level and there is a source to ignite it. The thought of a spinning metal blade colliding with bits of coal to create dust certainly set off warning bells in my head, so I made sure to always dampen the coal as I was processing it. This kept airborne dust to a minimum and I encountered no major issues in my project. I'm not sure if the ball milling process is able to accommodate the addition of moisture, but I would think that a similar method could be used.Best of luck with your work!

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  • The print was made in a gypsum-like material with a plaster powder / ZCorp-style 3d printer (see step 9).

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