Ender 3 SKR Rear Motherboard Enclosure for Ender Extender 400

thingiverse

Work in Progress This is a mainboard box designed specifically for attachment to the rear of a modified Ender 3 with the EnderExtender 400XL modification, allowing the SKR 1.3 board to be securely fastened. The box boasts multiple exits for wiring, tilt-in tabs, and M3 bolt holes to attach effortlessly to an 8020 strut on its side. It is highly recommended to print this box in PETG due to PLA's tendency to deform over time under compression, compromising the box's structural integrity. To further enhance stability, consider supporting it from below with rubber feet, ensuring a stable foundation for the printer. Two versions of this design are available: 1. A standard box featuring a top exhaust fan for efficient heat dissipation. 2. An advanced version with a hole cut for a stepper motor cooling shroud, which draws in cold air from outside while still utilizing a top fan to exhaust heat. Update 1/24/2020 After conducting an in-depth review of the Ender3 CAD model, I discovered that my initial M3 bolt holes were positioned too high to accommodate T-Slot nuts in the center of the channel. To address this issue, I have revised the design with rough rectangular holes and expanded them to fit M4 bolts. A new modified file has been uploaded, ensuring seamless integration with T-slot nuts such as those found here: https://www.thingiverse.com/thing:1061769. Update 1/25/2020 TLDR: New v3 box and separated lid file. Box is better. Following the first revision, I have made several improvements to enhance usability. The v3 version of the box now features no lips on the bottom set of extrusion interfaces, enabling users to rock the box into place and secure it using T-Slot nuts. This design modification allows for easy addition or removal of the box without disassembling the extrusions, particularly beneficial when working with printers featuring obstructed access, such as the Ender Extender 400. Additionally, I have reinforced a couple weak areas while maintaining the lightweight nature of the box. Although the driver duct version is still pending updates, these recent revisions have significantly improved the overall design. Update: 1/25/2020 mk2 I have created a prototype lid for the box that supports the drag chain found here: https://www.thingiverse.com/thing:2920060. A screenshot showcasing its integration with the Ender3 CAD files is also available, demonstrating a roughly 60mm bend radius from top to bottom. However, this design has been deemed unsuitable due to compatibility issues with the Ender Extender 400XL. Update: 1/31/2020 Version 4 of the motherboard box has been uploaded, incorporating several key enhancements. The revised design includes an additional 3mm of depth, a third T-Slot nut screw for increased bracing against the 2020 strut in the back of the Ender 400XL, and a hole for passing heated bed wiring and Y-axis wiring through under the strut. This is the working version I used to build my current printer.