Zortrax M200 dual airflow radial fan duct by liftbag

Last crawled date: 3 years ago

Important
For a completely revised version, move here: https://www.thingiverse.com/thing:2797152
Description (dual_flow_extr_shroud_V7B.stl)
This is an alternative way to having a double cooling flow on the area of extrusion.
The most popular way is to use a second axial fan installed on one of the many special bracket that can be found here on Thingiverse. I myself have published one here: http://www.thingiverse.com/thing:1901911
Later I saw an anular shroud for Wanhao D6 by ZincBoy and I really liked the idea ( http://www.thingiverse.com/thing:1666096 ).
The use of a radial fan is almost mandatory for this application, either for lack of space, both because the axial fans are characterized by a too low working pressure. The problem with the radial fan that I have chosen and which is the same used by ZincBoy is that it does not survive to the 24V PWM with which is powered.
Another problem is that if powered at 12V is so effective that the printing aborts due excessive extruder cooling.
So a small divider/filter circuit is necessary. The divider that I use allows you to print without problems up to 60% fan speed. If you want to print at a higher air flow you must isolate the hotend, for example with cotton coats that can be found on the market or you can use smaller heating block.
The circuit can be easily accommodated in the tray below the fan.
You can find the radial fan here: http://www.digikey.com/product-detail/en/delta-electronics/BFB0412HHA-A117/603-1840-ND/5022816
The design is meant to be printed without supports. Because of supportless design it might seem that the air flow is directed towards the hotend. Instead, the output ducts are designed to direct the air flow with a good downward angle.
You need a heat-resistant filament and that does not collapse with long bridges. The best results can be obtained with PBT filament and annealing in the oven, one hour at 60° C, one hour at 95° C, one hour at 60° C and then left to cool in the oven.
Also, three M3x25mm screws are necessary to secure the fan duct to the cooling block.
[EDIT 11/22/2017]
Well, you can now completely avoid electronics.
The radial fans shown at the link below tolerate the 24V PWM signal of the Zortrax M200, turn slower, are very silent and with the correct air volume.https://it.aliexpress.com/item/2PCS-Gdstime-3D-Printer-Fan-40mm-12V-4010-Turbo-Blower-Cooling-Fans-with-120cm-Cable/32811510363.html?spm=a2g0y.10010108.1000023.9.19306e00p907zT
[EDIT 12/06/2017]
Z-VENT_SLP_V4b.stl added.
If you use the radial fan of aliexpress and do not need any adaptation electronics, this is a lightened variant and optimized in various aspects:

> the main air duct has fewer obstacles, in particular the air intake window
> an area that created strong turbulence was eliminated
> to free the entry obstruction, I removed the third fixing front screw
> to improve the solidity of the assembly I have expanded the support base of the two rear supports
> added a curved fin at the entrance that supports the long bridge
> added two cable supports

The downside is the fact that this time it is necessary to put some supports. This is not possible with Zsuite V1, because the supports would also be generated inside the air duct. It should be possible to slice with Zsuite beta2.2 which has a more advanced support management, but I got the best results with Simplify3D, translating the gcode into zcode using ZTool.
For those interested in using third-party slicers with the Zortrax M200 this page may interest you: https://www.stampa3d-forum.it/forum/topic/4107-zdump-is-dead-long-live-ztool /
[EDIT 02/03/2018]
Z-VENT_SLP_V4b.stl has been replaced with Z-VENT_V9.stl.
The main improvement concerns the distance from bed of the rear area, to avoid collision with the perforated bed connector. Minimum adjustments to the inclinations of unsupported areas.