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  • Automated Ultrasonic Misting 3D Print Polisher PRO

    Righto, found the source of my acetone leak, and now I am at a loss as to how the original project has no leaks.Silicone sticks to most things with a vengeance, it does not however stick to polypropylene. This isn't just me, search google for example and you will quickly find a link like this:http://www.stealth316.com/2-dp8005.htmWhich says this:"Despite their widespread usefulness, "low energy" plastics have a quality that can make them hard to work with - they are difficult to seal or bond using commonly available sealant adhesives. Cyanoacrylate, epoxy, polyurethane, silicone (RTV for example), and most acrylic adhesives do not stick to polypropylene and polyethylene."I think the original project must have got very lucky not to have had leaks with Silicone.The abo...see more »Righto, found the source of my acetone leak, and now I am at a loss as to how the original project has no leaks.Silicone sticks to most things with a vengeance, it does not however stick to polypropylene. This isn't just me, search google for example and you will quickly find a link like this:http://www.stealth316.com/2-dp8005.htmWhich says this:"Despite their widespread usefulness, "low energy" plastics have a quality that can make them hard to work with - they are difficult to seal or bond using commonly available sealant adhesives. Cyanoacrylate, epoxy, polyurethane, silicone (RTV for example), and most acrylic adhesives do not stick to polypropylene and polyethylene."I think the original project must have got very lucky not to have had leaks with Silicone.The above link however handily leads you to a 3M adhesive: DP-8005, which is resistant to acetone and and sticks to PP.

    After deciding I didn't want to spend £23 on glue I bought a new container for the acetone. This time I am going to feed the transducer in through the top side of the acetone container so there are no holes in the bottom and then cover the transducer wire completely in silicone to protect it. Although from reading it seems the heat shrink covering the wires is probably polyolefin which is fine in acetone anyway. In addition Acetone is barely conductive so I think it should be ok even if it does get to the wires.

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  • Automated Ultrasonic Misting 3D Print Polisher PRO

    "Also I cannot understand the placement of extraction placement for the pump."Should read"Also I cannot understand the placement of the extraction pipe for the pump."And near not neat... and edit button would be nice on these comments!

    In addition to the above I have just realised the Acetone is escaping from the bottom of the container when idle. I had thoroughly covered the bottom of the ultrasonic transducer with the silicone gasket maker as well as putting it on the inside of the silicone surround the transducer is in, but obviously didn't get a proper seal. If you are doing this with the new design you will need to really smother the bottom of the transducer in gasket maker, make sure there is no way for the acetone to escape.

    Ok, so I have just finished building and it seems to work ok with the new internals of the humidifier. However I have a few notes for anyone else going in to this.The UK version of this humidifier comes with a plug transformer, so the transformer coil inside the unit is not there (this is a good thing as you are never dealing with mains voltage)However buying an expensive humidifier isn't really necessary. You can buy the actual component for a couple of quid: https://www.aliexpress.com/item/20mm-transducer-fi...So you would just need to figure out how to drive it. The silicone surround is important to stop the Acetone leaking, you could probably just buy this: https://www.aliexpress.com/item/High-Quality-Ultra...take it apart and hope it had the silicone membrane. Then all you would ne...see more »Ok, so I have just finished building and it seems to work ok with the new internals of the humidifier. However I have a few notes for anyone else going in to this.The UK version of this humidifier comes with a plug transformer, so the transformer coil inside the unit is not there (this is a good thing as you are never dealing with mains voltage)However buying an expensive humidifier isn't really necessary. You can buy the actual component for a couple of quid: https://www.aliexpress.com/item/20mm-transducer-fi...So you would just need to figure out how to drive it. The silicone surround is important to stop the Acetone leaking, you could probably just buy this: https://www.aliexpress.com/item/High-Quality-Ultra...take it apart and hope it had the silicone membrane. Then all you would need is a small piece of metal and drill your own holes in it to mount it to the acetone container.You would save yourself a good wad of cash and this project becomes more tempting to do.In addition to the above the bottom project box is basically not needed, and only really serves the purpose of making the pump sound very noisy. It would be much neater to create a mount for the motor, buttons and circuitry on your 3d printer. Having it out in the open would also mean much less chance of Acetone ever gathering near the electronics with the potential for a spark and explosion.Also I cannot understand the placement of extraction placement for the pump. Acetone vapour created by the mister is clearly heavier than air and I would have thought a better circulation would have been created by placing the extraction neat the bottom of the container. Finally I think if the return from the pump to the acetone container had a pipe that went in from the top and ended under the level of the acetone this would help it return to its liquid state much quicker as it would bubble through the acetone. There is a lot of potential to this project, but I feel it is very much deserved of a 'mk3' with some revisions that would improve the whole thing and make it look slightly less 'hacky'.

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  • Automated Ultrasonic Misting 3D Print Polisher PRO

    Also... reed switch... why are you holding it in the up position with a cable tie?It's a switch with two wires, which means its normally open or normally closed, so the connection needs either cutting or shorting. (It's shorting in this case, I'm just wondering why you chose the odd method of manually rigging the switch)

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  • Automated Ultrasonic Misting 3D Print Polisher PRO

    Just took the humidifier I bought apart and the design of the atomiser mount is completely different. real bummer as it doesn't lend itself nearly as well to mounting and I will have to make sure it is watertight so there are no leaks.Worth warning that these humidifiers are not all the same. I bought the duck but I imagine its an actual change in design rather than a difference between animals.

    Also... why do you have a fan on your purchase list when the Humidifier comes with one?

    Images of the 'new' atomiser

    In addition to the above the transformer has gone and it now has a 24v power pack. this may be an advantage one I figure it out as less power in the box is a good thing.

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  • Automated Ultrasonic Misting 3D Print Polisher PRO

    Do you just pop your parts on the bottom of the container, do you find they stick to the bottom at all?

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