Prusa Core One Rear Ventilation Mount 3in & 4in Hose 90deg

Why?

Using the Core One's rear M3 142x66 bolt pattern, I lofted that profile to a simple cylinder for 3” & 4” hose. I wanted to keep it as tight as possible to the back of the Core One, and point it vertically (90deg).

For those of you who are getting the Advanced Filtration system but still want to vent outside thru a hose, this is an option. This also uses less material than the original P60 filter can, if you need something quicker/cheaper.

Function

3in has a 72mm hose OD (3in) as modeled exit

4in has a 98mm hose OD (4in) as modeled exit

I've found a 3" vent is plenty as long as you have the fans to push/pull the air. But I made a 4" version as well. I have 3x 8ft sections of 3" hose joined by an inline ventilation booster fan, and that combined with enclosure fans does a good job pushing fumes outside my home. Link below if you’re looking for one.

Printing

Printed in .2 layer height, 60% infill, 4 walls, with painted supports below the overhangs on an A1 Mini (see pics). Probably could get away with 15%. 

Printed in Polymaker Polylite PLA Pro. Would print well with PET-CF or PETG-CF. Maybe the new HT-PLA (higher temp stuff) would be a good candidate here.

Print time is 6-8hrs depending on settings. 150-170g ish part. 

Links

Link for  Inline fan thru my amazon affiliate link. Anything you buy whether it's this fan or some other thing you need will help support my work for 3D models.

• Powerful 3 Inch Inline Duct... 

• https://amzn.to/4hqMcuH

UPDATE 2025/6/01: 

An error was pointed out with the fan screw reliefs missing. I didn't roll the model history forward enough and missed the features before exporting. I've re-uploaded the V3 models with the reliefs. I'm truly sorry about that for those that printed, I suppose worst case you will have to get out a file to make it work. Or reprint with the new models. I also made the reliefs so you can flip it up or down. 

UPDATE 2025/5/10: 

V3 Released! I've enlarged the screw holes slightly, and added counterbores, so as to use 8mm magnets or sink the screw head. May need to use shorter M3 bolts, possibly M3x8 or 6. A special 100.3ID version was added per request to adapt to an inline fan. STP/STL included.

P.S. I am not responsible for toddlers eating magnets, so please be careful!

Message me for other sizes and I'll upload them!

UPDATE 2025/11/12

Added 2.5" version. Increased 2.5" versions 8mm magnet hole size to 8.28mm. 

NOTES

Purchasing

If you don't have a 3D printer and would like to purchase this item, I would be happy to print and ship it to you. Send me a message at [email protected]. Located in USA but will ship globally if required. Shipping will vary and affect cost. 

You can purchase the 3" version here:

https://teleportpod.com/portal/65c0f9bc-14df-483f-85d2-a0b25f90076e?item=593

Many thanks to mkoistinen for the bolt pattern and base mount to start with - M3x10 vent bolt pattern (142mmx66mm). I made my own loft profile to the 3” and 4” hose exits, that can be clamped to your standard vent hose with a stainless steel clamp.