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[E1][P][M] 290L Barrel

A project log for SlimeSaver [gd0105]

Combining MSLA and LOM 3D printing to eliminate the time spent cleaning the slime.

kelvinakelvinA • 07/20/2025 at 10:03•0 Comments
I still struggle to fathom how some companies somewhere need not one, but multiple barrels of mango chutney.

While jumping through Ebay's "similar items" section within listings, discovering "wood barrel ice-baths", I found out that there's one semi-common HDPE barrel that is taller than the 220L, blue and doesn't use a galvanised metal clamping ring: the 290L barrel. Like the previous barrel, this barrel was acquired to store things outside, thus it's beneficial that the ring is made out of plastic. For safety with a 450/405nm laser, blue or white is more ideal than red, dark grey or black. It's also got 4 convenient indents to carry the barrel.

Cleaning the barrel

The one I found happened to be local; the going rates for both 220L and 290L seem to be sub £40/ea when collected instead of delivered. 

The black HDPE parts and the barrel's outside was scrubbed with a sponge and the inside was mopped:

290L HDPE Barrel
It's a 3-part assembly that is about 1115mm tall. This image was taken before cleaning.
Inside of barrel before being mopped. It looked rather clean, and I think the base looks a bit more orderly than the 220-litre. Allegedly, these 290L barrels were used to transport orange juice. but it smelled like a new car mixed with something else that I can't identify.
Mops don't work on walls, so I rotated the barrel 8 times to get around everywhere.

Modelling

I let it dry while I measured things for 30 minutes, mainly the height. I know it's taller than 1110mm but maybe 1120mm or less. Nominally, I got 1115 - 1116mm. Then I went to the other side of the garden to try and get a full-size image as orthogonal as I could so I could import the image in Fusion:

I used a measuring tape against the branch, the wall and the barrel itself to get my 1115mm height estimate. 

Taking a picture from so far away highlights how surfaces on the barrel aren't as straight as they might appear when closer. I left the lid on because I imagined that I could use its height as a reference, but now I think I'll just measure the height of the barrel's straight section.

I then spent over an hour modelling the lid:

It took ages to determine where fillets started and ended, and I had to use some 48mm tape as a spacer to be able to use my calipers to measure the wall's thickness and height. It's rare times like these where I wish I had a 3D scanner. Fusion's weight estimate is 750g and the real one is 100g less, and I believe some of that discrepancy is because I don't know the cross section of the seal. The HDPE lid alone is reported to be 600g in Fusion. 

I have yet to model the other 2 parts.

Trivia

I also tried using Wispr Flow for this log, but ran into similar issues as when I tried Windows Dictation over 2 years ago. I have to think of the sentence, send it to my mind's Speech Processing Unit, say the sentence, read the sentence and correct it. The first 2 steps is the bottleneck because I don't think of sentences synchronously, so I generally have to think of the entire sentence in my mind, recite it, and then say it. 

Maybe this workflow is a lot better for people who can literally just say what's on their mind? It's still better than Windows dictation because at least I don't have to worry about punctuation and the default CTRL+WIN shortcut is a lot less cumbersome than WIN+H.

[July 30]

Modelled the screw ring

Cross section of ring and lid
I've modelled the ring and kinda see how they're supposed to mesh together. It seems like it aligns with the lid modelled previously.
Cross section of the plastic ring

Then I had to do some tricks here and there to properly design the custom thread:

Left: Adding the curved start. Right: Combine intersection to trim away the excess.
Complete ring

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