March 17, 2018 00:30:39


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3d Printed Fluid Bed Roaster
Great circulation. How long did the 12oz roast take with your single element? Was it 1600W or did you change it?
I believe it's a 1680W element. The roast took 14 minutes, but ran at only an average of 940 watts. I used a ramp programmed to slowly bring the beans up to temp over 14 minutes, so it seems that it could have been quicker with a more aggressive ramp.

This design may be slightly more efficient than others, as the element is encased in insulating refractory material rather than heat conducting metal. Similarly, the bowl of the roast chamber itself is insulating and has a high heat capacity, it is room temp where it meets the plastic base, and only reaches about 130 degrees near the joint with the Pyrex tube. Additionally, the topper increases internal pressure in the roast chamber and prevents hot air from venting out the top too quickly.

Cupped today and happy with the result. Fuller body than my previous attempts with these Brazilian beans.

When the heat element is switched off the beans are cooled to 100c within 15 seconds and 40c within a minute or so. I do need a good way to eject and am wondering if the vacuum pressure would be enough to do so if I capped the top with a tube inserted into the bean mass.
Edited by Linnaeus on 02-20-2018 03:50
A quick modification - I added an aluminum plate to the rear of the chamber. Beans were circulating well in the front but we're stalling quite a bit in the rear. The new / steeper wall is giving a much better motion to the bed.

In the future I would not experiment with an off axis inlet unless all of the walls were significantly steeper than they are in my roast chamber.

Great efforts. I would be interested to buy from you the ready roasting chamber as you already have the molds. it is not wrong to sell them to cover your costs. but the size is too small. thanks
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