I mean more of the lines of "silent" instead of quiet...

Fan noises is pretty much the only noise I have right now. (even at 50%)

To put it into perspective, the noise from the ball bearing in my filament guide during retraction is the second loudest noise.

You should try TMC drivers... You will never go back :)

Running the fans at 50-60% is definatly quieter, the only noise i really have is the retractions from the bondtech feeder.

Only reason I asked for 40mm fan is because I want quieter fans... pretty much all 30mm fans out there with reasonable airflow is noisy as heck...

It is part of my project of making ultimaker quiet... I've done TMC drivers and a press fit print head for igus bearing.

40mm fans with lower RPM and same airflow is way way quieter...

Anyway, I will look for other options or designing my own. Thanks

The design only suits the standard 30mm fans, for several reasons

1) it keeps the printhead size and mass smaller still allowing for fast acceleration movements.

2) It doesnt need bigger fans, I designed these to reduce the back pressure that reduces the actual air moved by the fans that happens with the standard ducts. The gradual tapering shape reduces the buildup of the back pressure effect, when I measured the the actual output airspeed it was about double that of the standard duct with the same area for the opening, the majority of the time I run these at 50-60% speed maximum, I cant remember the last time I ran the fans at 100%.

3) the size of the 30mm fans allows the ducts to swivel and unclip to be easily removed, and also allows for the heat sink Han duct to be fitted.

These work so well I don’t need 40mm fans and I think that would also affect the home position as the additional size would need to be allowed for, They took me a few days to redesign to get the shape and the improved airflow, so i wouldn’t be doing a larger size and I dont think uploading the origional cad files would be of any benifit to modify as its just as easy to make your own measurements of the items to then design your own to suit the 40mm fans.

If you are still active, can you make a 40mm fan version of this? Or upload the original cad files?

The 35W should sort it out, I run with a 35W, the problem I had with the origional 24W was that when the fans came on they would cool the heater to 10' below the running temperature as the old heater couldn't respond quick enough then the error function would kick in and stop the print. If you do decide to print my ducts and use them in the future please let me know what you think of them. Happy printing, Izzy

Thanks Izzy.

I think a 35W Heater upgrade is in order, I had great success at 100% Fan with the Olsson Block and the stock shroud for little over a month now but only recently, since yesterday actually I constantly started to get heater errors at 100% Fan Rate. I made sure my Block wasn't touching the shroud but i still had the issue. Interestingly enough I only had this issue with my 0.6mm Nozzle which doesn't make any sense.

Anyway, I'll print the shroud and update!

Hi MrTechAgent, it's strange that you are now having issues after running fine with your old setup, are you running the origional fan duct or another's?

These duct are designed to improve the flow of the air to the output, the fans can't deal with backpressure, so these I have found these work fine, In fact I have to reduce the % so not to cool to fast, the origional fan duct used to produce different cooling on ears of the UM2 Robot, the left ear wasn't as good as the right, with these ducts the cooling now appears even.

You can adjust their vertical height and swing they out of the way to allow easy access to change the nozzle and clean. I would surgest trying the V2's and not the F or R varients. And don't forget to dial down the cooling fan rate.

Let me know how you get on if these solve your problem as others may be having the same problem. Cheers, Izzy

Hey Izzy, I had a question.

I recently started to have fan issues with my Olsson Block, I'm guessing this is my solution as the ducts are not pointing directly at the block, what do you think?

Thanks.

I have reduced my Fan Speed to 50% of the initial setting for the material settings, that way for Cura files when they call for fans to be 100% it's 100% of the material setting. The Olsson block being larger does struggle with the lower wattage heaters, but the air flow is much better than the standard duct and hence the need to reduce the fan speed, what you should notice is the improvement on the standard robot print, on both overhangs and that the left ear is much better and perhaps no different to the right ear.

Thank you for this!!