Digital Hygrometer/Thermometer for Chitu Systems FilaPartner E1 Filament Dryer

A case for a digital hygrometer for replacement of the "Passive Humidity Indicator Paper" in the Chitu Systems filament dryer.

Suitable for the widely available and cheap hygrometers, e.g. at AliExpress.

Parts:

• Front housing (with display opening)
• Back housing
• Battery cover

Printing Notes:

• The back housing requires support during printing.
• Designed for common, low-cost digital thermometer/hygrometer modules.
• Original housing dimensions: ~46 × 26 mm
• PCB/display size: ~40 × 22 mm (visible LCD area ~35.7 × 16.8 mm)

1. Remove Original Housing

• The original unit is held together by four small clips.
• Use a small flat screwdriver to gently pry open the clips.
• Separate the LCD/PCB from the original case.

2. Insert into 3D Printed Housing

• Place the LCD and PCB into the front housing.
• Orientation: The side with the “zebra strip” (contact rubber) is next to the slightly wider frame edge.
• Make sure the display sits flush and centered.

3. Attach the Back Housing

• Align and snap the back housing into place until all clips engage.

4. Install Batteries

• Insert the batteries according to the polarity markings.
• Close the battery compartment using the sliding battery cover.

5. Test

• The display should turn on and show temperature and humidity readings.