Extruder Drive Upgrade Bearing

[aaron 2]

Hi all. I have been having issues with the stock extruder for the UM1. The wheel attached opposite to the bolt with teeth machined into it has been worn down. I have been looking for a solution to this on Thingiverse but I have only found upgrades for the spring adjustment part of the extruder driver. Any files you know of that eliminate that flimsy plastic wheel and allow for the use of a bearing directly?

 

[IRobertI 521]

I don't remember the exact size but there are bearings out there that match the delrin ring pretty much perfectly that you can replace it with. I have one, somewhere... that I bought off of Ebay a long time ago.

 

[illuminarti 18]

I think they're 8 x 14 x 4 bearings - I bought some on Amazon. They'll fit over the existing bearing that fits inside the delrin wheel.

 

[IRobertI 521]

I managed to find the confirmation e-mail and yes, it was that size. Here's where I bought mine:

http://www.ebay.com/itm/MR-Series-Miniature-Model-Bearings-ZZ-Metal-Sheilded-Choose-Size-/320847074429?vti=Bearing%20Size%09MR148%20ZZ%208x14x4mm%20MR148ZZ%0ANumber%20of%20Bearings%091%20Bearing&ssPageName=ADME:L:CORT:GB:1123

 

[gr5 2,224]

And then there's this solution also:

http://umforum.ultimaker.com/index.php?/topic/1676-modification-of-upgraded-extruder-drive/?hl=%2Breplace+%2Bdelrin

 

 

[IRobertI 521]

That's the solution we're talking about

 

[kinggorilla 0]

At the time I couldn't find the right sized bearing, so I made a ring of aluminum the same size as the delrin one on my lathe. Haven't had any problems since.

 

[aaron 2]

Yeah, not sure why UM didn't just include one stock...