Seed Dryer 85x85mm with 3 trays for 80x25mm fans

Medium sized seed dryer I made for a friend who grows a lot of chilis with super tiny seeds with about 1mm in diameter.

Features: 

• It contains 3 trays with the size of 85x85x15mm. 
• The trays fit tight with a 0.25mm gap into the tray holder.
• The fan is located in the bottom and presses the air through the trays to the top.
• The size of the holes can easily be adjusted by changing the infill value of the trays and the holder.

Parts used:

• Fan: I used a 80x25mm 12V Noctua NF-R8 redux fan to keep it really quiet (max. 17.1 dB(A)). 
• Power supply: A power supply with 12V/1.25A was used for this project which is way to strong for the small amount of power used by the fan. A smaller power supply with 12V/1A with a 5.5mm x 2.5mm barrel jack plug will be good enough too.
• Power jack: The shown power jack is screwed into the 12mm hole in the base to power the fan.

Wiring: 

The +12V needs to be connected to the yellow wire of the fan and the GND connection goes to the black wire of the fan. That should be an easy soldering job for these 2 connections. I screwed it first in place and then soldered the 2 wires in the fan base.

The wire needs to be routed through the little 5mm square hole in the base part.

Printing instructions:

If you don’t want to use my GCode files for the Pruss MK3S+ then you need to adjust the print settings for the tray holder (part “Lid”) and the 3 trays (part ”Tray”) to the following settings:

• Profile and resolution = 0.3 draft profile with these additional settings:
• Contour lines = 3
• Top layers = 0
• Bottom layer = 0
• Infill = 60% (can be adjusted for the diameter value of the holes)
• The 2 "Base“ parts need supports as shown in the pictures
  • The bottom base part needs supports from the pinters bed
  • The top base part needs supports set to overall
• The 2 “Base” parts also use the usual settings for bottom and top layers
• The infill setting for the 2 base parts was set to 20% again

Note: The trays should not be opened when the fan is turned on, because the fan pushes 53,3 m³/h. through the trays… ;)

Happy printing :)