Prusa i3 mk2 - Fan Duct Improved

thingiverse

First of all: I choose the GPL license cause the original prusa i3 mk2 uses the same license. I hope this doesn´t offend anyone - If it does contact me and we will work it out. (the orange one in the picture is the original part) I made this based on the stl-files provided by josef prusa and modified them just a bit. 2 differences have been done: The inlet side (facing the top - fan - when mounted) is a bit higher - around 1.8mm. This will close the slight gap I had on my printer and prevent too much air from coming out there. The outlet side opens like 1 mm shorter so the air is directed a little bite more below the heater block. I have done a few successful prints with this and the cooling isn´t worse than before and the closed gap makes it a little bit quieter. I can´t tell if you really need this mod - it is working for me and that was my indention. And yes i removed the "HOT" Warning on the front (this is facing the heatbed while printing) to get a better adhesion. UPDATE: the new "improved" version will print without support - the cheap trick here is to add 2 solid layers (when using 0,2mm layers) between the big hole for the screw head and the smaller hole above for the screw itself. This has to be removed with a drill bit or a small screwdriver but not having to use support - which is hard to remove inside the hole - is worth it. Print Settings Printer: Prusa i3 mk2 Rafts: No Supports: Yes Resolution: 200 micron Infill: 100% Notes: I used ABS for this print cause PLA so close to the heater block might get molten (especially when not using the fan - as for ABS mostly). For the small "stick" (from 17mm height on) you need a little bit of cooling otherwise it will get messed up. I´ve done this by the following settings in slic3r: auto cooling on fan speed min 10 max 30 disable fan for the first 5 layers enable fan if layer print time is below 10 seconds slow down if layer print time is below 5 seconds min print speed 5 mm/s You need some support for the screw hole, I used the following settings: generate support on contact z distance: 0 pattern rectilinear grid pattern spacing 1mm pattern angle 0 interface layers 2 xy separation: 1mm this will create a small support for the screw hole. and cause the screw will cover it up it doesn´t matter if it won´t look nice. You could modify the design by remove the bigger hole for the screw head and use a longer screw - this will not need any support then. UPDATE: the improved version will print without support.