Bottom Electronics Enclosure & PSU Mount System for Duender

Overview

This is a comprehensive bottom-mounted electronics organization and enclosure system designed specifically for the Duender 3D printer (by Sergei Irbis).

Note on Geometry: This setup is configured assuming the bed extrusion sits at 105mm from the front extrusion—slightly further forward than the original stock Duender layout, providing what I found to be an optimized and cleaner internal clearance.

The system is split into 3 main modular components:

1. Main Electronics Case

2. Rear Power Supply (PSU) Mount

3. Power Wiring / Terminal Cover Box

Component Breakdown

1. Main Electronics Case

• Capacity: Tailored to comfortably house a BigTreeTech SKR 3 (or equivalent-sized mainboard), a Raspberry Pi, and a dedicated 5V 10A step-down power converter (AliExpress Link). (It is spacious enough to fit a BTT Octopus, though you would need to adjust the mounting points and connector routing slightly).

• Cooling: The top lid features an integrated mount for a 120mm fan, which blows air directly across the mainboard for high-efficiency, ultra-silent cooling compared to noisy small fans.

• Dust Protection: Includes provisions inside the fan/vent structure to glue or heat-fuse a dust filter mesh (AliExpress Link).

2. Rear PSU Mount

• Compatibility: Designed to fit standard Mean Well LRS-350-24 (Ender 3 Pro stock 350W power supply units).

• Frame Fit: Fully compatible with the double-bed mount setup. Note: It is NOT compatible with the triple-motor bed mount layout, as it occupies the space where the third motor would sit.

3. Power Wiring Box

• Encloses the high-voltage mains AC screw terminals on the PSU for safety.

• Integrates a standard Ender-style power inlet socket, positioning the plug neatly right under the frame.

• Features dedicated space to mount an SSR (Solid State Relay) directly to the printer frame (for heat dissipation) and plenty of internal clearance to route and zip-tie your AC/DC wiring safely.

🛠 Hardware Required (BOM)

For the Main Electronics Case:

• 14x M3 Heat Set Inserts

• 14x M3x6 Screws

• 4x M4x8 Screws

• 4x M4 T-Nuts

• 1x 120mm Fan (24V recommended)

• 1x Dust-proof mesh screen (optional – glue or heat-fuse inside) (AliExpress Link)

For the Power Wiring Case:

• 3x M4 T-Nuts

• 3x M4x8 Screws

• 2x M4x10 Screws (to secure the power socket)

• 2x M4 Nuts (to secure the power socket)

• 4x M3 Heat Set Inserts

• 4x M3x6 Screws

• Zip-ties / cable ties (optional, for internal wire management)

For the PSU Mount:

• 8x M4x8 Screws

• 8x M4 T-Nuts

• 1x M3x8 Screw (to secure the PSU body)

Print Settings Recommendation

• Material: PETG is fine. ABS or ASA are even better.

• Layer Height: 0.2mm

• Walls / Perimeters: 4 walls for structural rigidity.

• Infill: 25% - 35% (Gyroid or Grid).