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Hi all, this is my first post here.

Over winter break I got bored and decided to try learning some CAD to make a new lomo like spiral tank for 16mm (or in my case double 8), because the results from a Morse G3 just aren't cutting it.

Its by no means refined, but in theory it should hold 100' of 16mm film.  I was going to do a test 3D print at a local makerspace, but then the pandemic moved in and that plan kinda fell apart.  I looked online at a few places that do prototype printing, and the cheapest I found was about $110 including shipping, which is a bit much for me at the moment, but is still cheaper than a lomo on ebay!

The picture is of the bottom piece.  The film would fit into a slit in the center (you can't quite see it in the pic), then you'd put the top on, use a plain old nut and bolt to hold the two together, and then begin spinning the reel assembly clockwise to wind your film on.  I wanted to make it fit inside a 5 gallon bucket, but its a bit too wide, 30 cm in diameter to be exact, so some kind of container would need to be found.

If anyone has access to a 3D printer and wants to give this a go, I'd love to see how it turns out.  I'll put the STL files up in another post because they're too big to attach here.

Let me know what you think!

bottom.JPG

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Thanks for sharing. What exactly do you want to know? I have a 3D printer the Ender 3 which is a common one and I can tell you that it is too big for my printer, but I could print the center maybe to see how the film runs trough it. Are you supposed to start loading from the center?

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I just figured I'd put the files out there in case anyone had access to a printer and wanted to give the tank a go before I get a chance to.  The film does load from the center, just like a lomo tank.  I figured if you fold the end of the film over, then put the folded part in the top of this groove, it should thread on fine.

1.JPG

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It would fit a 20x16 inch print developing tray, but at the expense of quite a bit of extra chemical. They are about 3" deep.

Unless you could 3D-print a daylight tank...........

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For a smaller tank that is a touch wider than a 5G bucket head over to a car parts store and find one of the round oil drain containers. Mine has a spin-on lid and a hole in the center of what is a weak funnel. This option also has a drain off to the side.

Phil Forrest

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Hello Neighbor!

I am in Minneapolis and have been working on similar processing designs for S8. This is great! I work at a prominent arts/design college and we have access to some STL printers as I assume FDM might be a little to rough for film but could work. I am unsure of the bed dimension of these and will check. I would love to help out with this since I am closer then some of the folks on here so shipping would be cheap!

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Just wanted to chime in and say: excellent work Sam. This is something that could be quite a game changer for those among us who process at home and/or are part of small, independent film labs. Lomo tanks are great, but very fragile and expensive because the are scarce. The bakelite tanks break easily and the spirals can't withstand heat very well (if you use homebrew drying constructions). 

If the design could be extended to tanks and different sizes, I would not only print them, I would purchase them. And I don't think it's hard to offer reasonable prices compared to 100ft Lomo tanks. 

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very interested in the......development.....of this.......I'm converting a garden shed into a darkroom so Im looking to process up Tri-X super 8mm myself as an example

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