YAMM (Yet Another Mini Me) hot-end duct for Ender 3

Designing YAMM

I was unhappy with the hot-end ducting (no need to name it), and in looking for improved setup was impressed by the Mini Me V4 and the comments about it.

In adapting to components, I had on hand (50mm blower, 15mm deep fan, and BLTouch), I ended up building a model that -while inspired on the Mini Me V4- is actually designed from scratch. The slightly smaller footprint of the ducting allowed the mounting of the BLTouch in parallel and directly to the plate with its separate bracket (not attached to the hot-end or ducts as some remixes).

Since the Mini Me was used as a point of reference for the new design, it is appropriate to thank its designer Philipp_269332 and provide attribution (even if the YAMM model was built from scratch). 

Printing YAMM

It is recommended to print at 0.2mm layer height. The breakout of components simplifies printing.

• Shroud: Enable Support - On build plate only.
• Ducts: Enable Support - On build plate only - Print flange at 45 degrees of build plate, as oriented in STL model (see slice picture).
• Brackets: Enable Support.

Components in photos were printed with Ender 3/Klipper sliced with Orca with eSun Black Matte PLA. 

Assembly

It is easier to install the BLTouch bracket before reinstalling the hot-end cover/shroud. It maybe installed after the hot-end cover/shroud is in place, through the upper left hole of the fan mount (before installing the fan).

Breaking the ducts as a separate part made longer screws a necessity. In the pictures, the fan height (not the blower) is 15mm, and is shown installed with 30mm M3 screws (did not have 25mm on hand). If using fan with 10mm height, 25mm screws should work (not depicted or tested).

Due to the limited space available between the flange of the hot-end cover and the Ender3 plate, it is easier to install the screws as pictured: nuts in front. Using a hex key short side, hold the screw head in place while turning/tightening the nuts slightly until the assembly is firm.

Illustration Images Attributions

• Ender 3 component models in pictures by Creality at Github/Creality3DPrinting.
• BLTouch model in pictures by Grabcad user Felix.Ort-1.
• MiniMe V4 model in comparison picture by Printable user Philipp_269332.

This is inspired by the Mini Me V4 with the following changes:

• New design.
• Uses larger 5015 50mm blower.
• Slightly smaller model footprint than Mini Me V4 (see picture comparison).
• Removed wiring stud, instead provides zip-tie slots at the top.
• Ducts are a separate model, hot-end shroud cover another. Allowing simpler printing and removal for cleaning.
• Two bracket versions to support a 50mm 5015 Blower (10mm or 15mm fans height).
• Bracket for BLTouch that mounts separately, parallel to plate.
• Requires 4 x M3 screws/nuts (20 or 25mm depending on fan height) to mount fan).
• Requires 2 x M3 screws/nuts (20mm) to mount 5015 50mm blower.
• Requires 2 x M3 screws/nut, + 2 x M3 screws (8mm) for mounting the BLTouch and bracket.