3" exhaust duct for Renson window ventilation

This is my ventilation setup for my qidi q2, which ventilates off to a Renson window ventilation duct.

These style of ventilation ducts are fairly popular in europe. The ducts clicks in place using the small plastic pieces that the folding ventilation duct click into. It connects to a 3" hose, which connects to a 3" fan exhaust on my qidi q2. The model may require some editing to fit your ducts but that's why I share it fully editable. 

• Print orientation -> see screenshot

• 0,2mm

• arachne wall generator!

• Inner/outer

• 4-5 walls

• whatever infill (doesn't really matter)

• Tree support, only on buildplate, treshold 25%

• don't put the speed of the supports too high

If you don't have a Qidi Q2, the following section doesn't apply, but nonetheless the print is universal and still can be useful. 

The ******* Qidi ventilation system..

I wish there was more information online, so I didn't have to do as much guess work. Contrary to what you read online, the exhaust fan is plenty strong. So doing the hassle of modding the exhaust fan seems useless to me. But there is one caveat! You have the remove the useless filtration block. The filtration does nothing, it will not filter your air, the amount of activated carbon in there is just enough so the sales team can say they have a triple layer filtration system. The only thing that block does is block the airflow and stop you from achieving a decent negative pressure. Do the test yourself and blow out a candle with and without the filtration block in it. see how long it takes for the smoke to clear. 

Toxic filament settings (ABS, ASA, Nylon, ...) = Do not exceed 70% chamber exhaust with the chamber heater running full blast. Based on my tests and experience, you will trip the thermal switch of the chamber heater in a long print. (Tip: you can check this sensor in Mobileraker app during a print). 

I also highly recommend to modify the Macro.cfg code of you printer to already activate the exhaust fan during the first purges, as this also releases a lot of fumes and usually at the same time that you are in the room. An easy way to do this is to modify the "move to trash" macro. Every purge goes to the trash, so this ensures you always activate the filter beforehand. Then put M106 P3 S0 stops at the end of the other purge macro's, this ensures the exhaust is not running full blast in the heating section that follows subsequently. 

(I'm no expert here, AI was my companion with the .cfg code, but I'm glad to help if you are struggling.)