Alternative Fan Shroud, Mount and Extruder Cover for DissEd

thingiverse

###Note: Thanks to Fernando (Nandox7) for pointing out the shroud was hitting the probe if you're using the Prusa PINDA style...I have a larger LJ12A3-4-Z/BX probe so my mount point is pushed further to the right to give extra clearance. Therefore I have added two new stl files for the Extruder Body, one that fits my 12mm style induction probe and one for the standard PINDA style. The Pinda version just has the probe mount shifted 4mm further to the right, the 12mm probe version is moved 8.5mm and has a larger mounting hole. Probe offset for the 12mm probe version is X31.5 Y5 and the PINDA style should be X27 Y5. #Version 3 Updates 1) Rotated the Blower Fan to a more upright position and made a thinner Fan Shroud (to give more clearance from the nozzle) 2) Added second mount point on the right side of the Fan Shroud 3) Updated Extruder Cover for new Fan angle and to accommodate the extra Shroud mounting point. 4) Shortened the Fan Mount Arm to match the new Fan angle. I had to compromise some design aspects for this version because I wanted to give more clearance between the base of the Shroud and the nozzle to there is less chance of any deformations causing problems by hitting the prints. Therefore V3 loses the captive nut in the Mount Arm and you will have to carefully tap the hole at the end and be sure not to overtighten the bolt. The arms on v3 of the Shroud have wider spacing so they are a little further from the heatblock and the extra mount point is trapped between the main Extruder Body and the update Extruder Cover. It means you have to take a bit more care with the assembly but the finished product is rock solid :) ###V3 Assemble order: 1) Attach the v3 Extruder Cover using only the upper screw (loosely). 2) Attached the Fan Shroud using the standard Extruder fan screw (loosely). 3) Align the other Shroud mounting point between the Extruder Body and the Extruder Cover and tighten the screw to clamp them all together. 4) Tighten screws from step 1 and 2 5) Add the Fan Mount Arm to the Extruder Cover & tighten. 6) Add the Blower Fan making sure the mouth sits inside the Shroud opening, you may need to ease the top mounting point over the end of the Fan Mount Arm to get a nice fit. 7) Add both Blower Fan screws, they should be firm but not super tight; it's not load bearing so as long as it doesn't wobble about, that's tight enough! #Original Version Description ###Short Version: 1) Improved Fan Shroud 2) Improved Extruder Cover 3) Improved Fan Mount Arm 4) Fixed Part Fan geometry ###Long Version: Firstly, I love the original modular design of the MK3S DissEd extruder carridge, thanks to drobfro and other contributors for this great design. After using this for a while with the standard Prusa fan shroud I had an issue that my OCD just couldn't leave! It all started when the standard Prusa Fan shroud arms started sagging after getting too hot, eventually they started draging on the prints causing them to fail. After looking and trying some alternative fan shroud designs I noticed some were actually too tall for this setup so I descided to design my own. I started with the excellent DissEd X-Carridge design and modified the Extruder Cover to improve the strength of the part fan mount, the original design is relatively weak where it joins the main body due to the location of the fastening screw. (The first time I printed the original design the arm for the fan mount warped a little bit and I had to straighten it carefully with a heat gun!) I've also updated the design for the seperate Fan Mount part that bolts to the Extruder Cover. The original geometry didn't seem right for my 5015 blower (not sure if it's just mine) and the holes didn't line up to the mount points on my fan without it being twisted slightly. It was also easy for the original part to rotate when tightening the screw holding it to the Extruder Cover. So I fited the hole geometry, beefed up the mount arm and included a flat top-edge so it rests under the stepper motor and stops it from twisting. My Fan Shroud design has wider arms so it sits further away from the heater block and will hopefully be more resistant on longer prints. I increased the sloped side near the fastening nut to provide more contact area with the Extruder Cover and I reduced the tolerance so it's a snug fit (warning, you may have the shave off a small amount to make it fit depending on your printer accuracy). The tolerance on the mouth is also tight because I wanted a nice push fit for the fan. I think this design feels much more solid and personally I would rather spend some time working these parts to fit snuggly compared to the orignal design that wobbled about. Hope you find this useful if you've had similar issues.