Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  

UM2's small cooling fan

Recommended Posts

correct as Robert said.. the small fan is blowing a concentrated wall of cool air onto the hotend to stop the heat from traveling from the heating cartridge up the hotend... possibly allowing for the PLA filament to expand in the Bowden tube and stopping the flow of material.

So a bigger fan for this purpose is not needed !

Ian :-)


Share this post

Link to post
Share on other sites

Thanks for the reply. I suspect that the PLA filament does expand in the isolation teflon part and causes the under-extrusion problem. I do not have any proof yet though.

The performance of the cooling fan, I suspect, will degrade when the printer becomes older. It will complicate the situation.


Share this post

Link to post
Share on other sites

While the UM2 is printing you can place your finger on/inside the head so that the tip of your finger is touching the heat sink and the side of your finger is almost touching that ring with the holes in it. If you "stay loose" you can "surf" the head as it wiggles around. It's not very hot. At all. It's a pleasant temperature, nowhere near the 220C that the nozzle is at. So it seems to work very very well as far as I can tell.


Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Our picks

    • Taking Advantage of DfAM
      This is a statement that’s often made about AM/3DP. I'll focus on the way DfAM can take advantage of some of the unique capabilities that AM and 3DP have to offer. I personally think that the use of AM/3DP for light-weighting is one of it’s most exciting possibilities and one that could play a key part in the sustainability of design and manufacturing in the future.
        • Like
      • 3 replies

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!