Nuclear Magnetic Resonance (NMR)

[conradelektro]

@skywatcher: interesting, I will test the watertightness of my printed tube. On first sight and with a "blow-test" my tube seems to be tight, but I will do a test over days.

@Smudge: after a long contemplation, I decided to abandon a build and further tests. My electronic skills are not adequate and I do not want to go to the public workshop where I could set up the whole thing because of the Coronavirus (I am an old man who should not get the virus).

My very little contribution is the attached PDF-file which contains links to the necessary equipment (RF amplifier, capacitors, magnets). And if someone wants a 3D-printed circular tube, please send me a PM with a shipping address. I am prepared to produce and ship a few for free. I can also send the .stl file which has to be fed to the slicer for your 3D-printer (to produce the g-code). But if you have access to a 3D-printer you would want to designe the tube yourself.

Greetings, Conrad

[conradelektro]

@skywatcher and all experimenters: my 3D-printed tube is not watertight.

After a while at the lowest point (if the tube is suspendet vertically) water dissipates through the 1 mm thick PLA (which consists of 0.2 mm strands stuck together by heat).

Such a tube has to be treated with paint. Heat, I guess, would distort the shape of the tube before melting it uniformly.

Skywatcher taught me an important lesson.

Greetings, Conrad

[ramset]

Conrad, your contribution here has been greatly appreciated ,I am contacting a few who can carry this open source effort  forward here. also asking about simple methods to seal the fixture [shellac or] that would not effect the experiment.
tremendous gratitude

Chet K

PS, there are a few more builders topics coming to the forum.[one water Fuel topic too [heating..or ?

[skywatcher]

@skywatcher and all experimenters: my 3D-printed tube is not watertight.

After a while at the lowest point (if the tube is suspendet vertically) water dissipates through the 1 mm thick PLA (which consists of 0.2 mm strands stuck together by heat).

Such a tube has to be treated with paint. Heat, I guess, would distort the shape of the tube before melting it uniformly.

Skywatcher taught me an important lesson.

Greetings, Conrad

I have made good experiences with heat treatment of 3D printed PLA parts. Not only for sealing, they are also looking better sometimes after heating the surface. I use a small gas torch (size like a lighter, but with a blue flame, you can get them in 1€ stores) and if you do it right this will not distort the shape, it's only necessary to slightly melt up the surface. You need the right lighting angle to see the PLA melting. As soon as it gets shiny, you have to stop heating. After this treatment it should be watertight. Maybe you should increase the thickness of the wall a little bit. 1mm is very thin. Maybe 1.5 or 2 mm would be better.

[skywatcher]

That's the kind of torch i'm using:

https://www.amazon.de/Sturmfeuerzeug-Feuerzeug-nachf%C3%BCllbar-Gasbrenner-Flambierer/dp/B01MYC8683/