Pretty much the only game in town if you are looking to anneal your engineering filaments, with the added benefit of a filament dryer. Amazon has the Sunlu E2 filament dryer & Annealer on sale for $254.99 for a limited time. You can also get the dryer an additional 12% off ($228.18) if you buy 2 of the Sunlu filaments listed as qualifying items in the promotion on the product page. Currently, the cheapest option for that is the "SUNLU PA6-CF 3D Filament 500G" for $17.09/ea. (additional 5% off when you buy 2). This brings the total for the dryer, and 1kg of Sunlu PA6-CF filament, to $258.57 before tax.
https://www.amazon.com/dp/B0F5PMMXKD
Cheapest filament now $21.99 
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Generally, annealing temperatures start at 80C up to 240C+ for exotic filaments like PPS-CF. That's whatbyoure paying for with the E2, the 110C max temp. The S4 can only reach 70C
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For the West3D toaster, does anyone know if it has a fairly accurate PID controller? The product itself looks like a modified toaster oven with a custom controller, but there's no details on said controller or how accurate it is on the website or the manual. Also, the website states 120C max temp but the manual states 100C. The manual also says no annealing, only drying. Would be nice if it was accurate enough to anneal as it's significantly cheaper! ($170 vs. the $250+ for the E2)
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