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Maybe also add something like cornstarch or photocopier toner into the oil to make the layer less translucent.
Clever idea. I dont know much chemistry but could you float a thin layer of oil for example and then float an multicoloured LED that would only colour or maybe flourese that thin layer. Then you could use the same liquid and change the colour for maximim contrast with the item you are scanning. Then you could take an underwater picture at the same time - the underwater camera might not work if lower liquid not transparent.
There is a lemon smell when the liquid boils away then just normal plastic heating smell. I found that the sticky surface can last for 3-5 prints. It is almost too good because do have to wait for bed to cool so the print separates from bed. Then clean with hot water/detergent, dry. Test bed alignment. Then rub with acetone/paper towel to clean grease off the glass surface. Reapply juice then good to go. I got bottle from supermarket so it was reconstituted.lemon juice used for cooking.
i use lemon juice or sugary water when printing pla on to a heated glass bed. Preheat bed, apply lemon juice, it steams away the liquid fairly quickly leaving surface sticky. Other trick is to turn on cooling fan after 3 or 4 layers have already printed
Interesting ideas. However I would be a little cautious about the storage ideas for children toys. If a child accidently get hold of a container full of medication similar to one already used for their toys, there is more risk that it will be opened to play with the "toy". I once saw something similar where a mother repurposed a trigger squeeze bottle that used to contain cleaning products, with water. Fun at the time but eventually backfired.
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