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04/19/2021 8:46 AM
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Sandbox Smart R1 roaster
mtbizzle
Just saw this apparently new roaster. The price in relation to the batch size is obscene. Aside from that, curious what everyone's thoughts are!

https://www.youtu...HoVu5NQe7I
Roast: Kaldi wide, SR800, various other projects
Grind: Niche, Bunnzilla WIP, Commandante
Favorite equipment/approaches: Decent, La Pavoni, iced prismo aeropress (Tom's recipe), Hario switch, Hoffman-style french press
renatoa
Price is new Taiwan dollar = 0.035 USD, so $732, reasonable for a bling roaster.

If BT is measured right, it could be a bargain as a sampler, given the curent price of other samplers.

I flirted for a while with such build roaster, bigger basket, 2-300 grams load, using as heat source a TO, but the gloves operating of hot basket was been indeed annoying, so moved to other build.
Also, all the chaff remaining in the basket and burning... not good...
Edited by renatoa on 11/16/2020 2:49 AM
renatoa
On Amazon, as combo with a cooling tray:

https://www.amazo...08J818GMR/
Turnado
Bella Barista will stock Sandbox Smart R1 very soon. Id like to see the reviews of this one. Could be just right for learning profiling at 100g batches.
renatoa
Analysed the machine and I would refrain to buy it for many reasons.

No visible chaff management. I built years ago such machine and the mesh baskets are bad for chaff, more than half will remain inside, and burnt. Smoky flavors.
Inconsistency in load and dump beans. Doing these operations with a hot basket and gloved hands is an operation hard to reproduce exactly, that make you give up quickly.

The most important is the reported temperature, as it is measured can't be enough precise for the requirements of an accurate RoR to be computed. Could be a reason RoR is not drawn on the graph, just shown as numbers only. Too jumpy and ugly to see, maybe.
The temperature is measured using three IR sensors, placed in a vertical bar cluster, you can locate them right side of the shaft, about 3-5 hours position.
The problem with that placement is that area contains no beans, it is simply void, in a normal operation, when the drum turns. Check the image showing a normal beans pile distribution. The beans are in left side, in the 6-9 hours segment, where are located also the radiant elements.
The area where IR sensors are placed is exactly opposite of the beans pile, where is absolutely clear, just air, no beans.
So those sensor can't measure anything other than the drum metal, and even this is questionable, because it is shinny, not a good target for an IR measurement. And the hue will change in time, as the drum is seasoned.
Someone could write a piece of code to compute the beans temperature and simulate the whole roast process more accurate than this measurement system. I highly doubt this measurement is capable to show FC, flick or crash in a roast.
I say this because I did such piece of code for Gene roaster, and the results of simulation were close to reality within 5 degrees window of approximation. I mean my code shows 195 C degrees when FC occurs, while Gene display reads 238 C degrees, hot air exhaust obviously.

So, until more clarification from the manufacturers, for me this machine is just a nice try of contemporary design that roast coffee with a certain approximation. Others do it better for less money and larger loads.
renatoa attached the following images:
drum-rotation-diagram.jpg nvv9ju5jsbvfee.jpg

Edited by renatoa on 02/14/2021 2:34 AM
renatoa
Available to buy at bellabarista, nothing new since last review.
So I would keep my money for other machine.
baldheadracing
Dave C did a review. He's usually pretty spot-on.

https://sway.offi...UqjfiA30Eu
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