Jump to content
Ultimaker Community of 3D Printing Experts
rwig

Knurled wheel sliding off of feeder. How to keep it on?

Recommended Posts

Several months ago, I purchased an Ultimaker 2 Go and it has been working just fine. The knurled wheel has stayed on/tight the whole time.

20170330_025005.thumb.jpg.d65fc713e14e788f4360dd91ba353229.jpg

I just purchased a second Ultimaker 2 Go about a month ago. Two weeks in the knurled wheel slid off the feeder mid-print. So I had to unscrew the feeder, push the knurled wheel back on so that it was flush, screw the feeder back together and start printing again. It's been about a week and the knurled wheel has slid off again mid-print.

20170330_024123.thumb.jpg.691d0a54878b54a3d06908c1bd7f787b.jpg

How can I make it so it stays on and doesn't slide off?

I found in the forum a couple similar posts like this one:

Knurled wheel - innie or outie??

In it, there are suggestions for tightening, or adding glue or loctite/threadlock to make it stay on.

Another commenter said: "Maybe just replace the grub screw. You could replace it with a black high tensile grub screw that you will be able to tighten it more without damaging the Allen key socket. I would recommend getting the upgrade kit to the new feeder which won't have this problem."

I guess the grub screw is the tiny screw that is in the knurled wheel. I have tried to clamp this with my pliers and tighten it but I can't get a grip on it. Should I get smaller pliers? I also tried using a mini hex screwdriver but it doesn't turn. Is this the solution to figure out a way to tighten this grub screw? Or should I use glue/lockite/threadlock to secure the knurled wheel to the feeder shaft. I'm not sure if this would cause it to not spin properly?

20170330_024332.thumb.jpg.9e0179ae58d8ad707b5996e46ad81c05.jpg

20170330_024512.thumb.jpg.244e0b8b625a7dccb1dc3fdc8004b41b.jpg

There's some differences with the serial number sticker and on/off button of my 2nd Ultimaker 2 Go leading me to believe it may be from an older batch where maybe the grub screws (or the whole knurled wheel) was not right or something. Or maybe there is a solution in just tightening or gluing it on? If anyone can suggest how and the right tools to fix this.

Thank you in advance.

20170330_025005.thumb.jpg.d65fc713e14e788f4360dd91ba353229.jpg

20170330_024123.thumb.jpg.691d0a54878b54a3d06908c1bd7f787b.jpg

20170330_024332.thumb.jpg.9e0179ae58d8ad707b5996e46ad81c05.jpg

20170330_024512.thumb.jpg.244e0b8b625a7dccb1dc3fdc8004b41b.jpg

Edited by Guest

Share this post


Link to post
Share on other sites

Thanks Torgeir,

(Please excuse my silly questions).

To remove the screw, should I get smaller pliers or vice grip pliers? It only sticks out a bit and my normal-size pliers can't grip it. And then I suppose just apply on the locktite blue and tighten back in?

It would be easier for me to just use the JB Weld epoxy as I already have it and both my reseller and North American Ultimaker support said that should work just fine to secure it. And they said if it doesn't, they can mail me the necessary replacement parts. But is that common someone would need to change their knurled wheel in the future? It feels like a solid part that will withstand years of retractions. Or is there a good chance I would need to change it in the future? If you think so, then maybe I should go buy the threadlock and special pliers or vice grip to remove the screw?

Share this post


Link to post
Share on other sites

When you get a 1.5mm hex wrench, also get the Loctite threadlocker to apply on the screw threads before inserting it.

If you can find the purple threadlocker (Loctite 222), that would be preferable to the more common blue type (Loctite 242) since the screw is less than 6mm in size. If all you can find is the blue type, it should be OK, but the screw will be harder to remove if you ever need to do that. The JB Weld, on the other hand, may make it impossible to remove the knurled wheel at a later date.

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

×

Important Information

Terms of Use Privacy Policy