Ultimaker feeder upgrade
Description
Instructions
Edit: Uploaded a video of the piece mounted on the Ultimaker: youtu.be/OAo04N6xTbs
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just made one, ordered the amazon part mentioned in the comments. the print came out either too small (thin) or else the bearing is too wide -- if i tighten the screws fully, it squeezes the bearing so it no longer spins.
There is some support in the design that should prevent the bearing from stop spinning when the screws are tightened. In my print the bearing was fitting perfectly, what are the inner dimensions of your bearing and the outer dimensions of the cylinder that supports the bearing in the printed part?
Also I printed it with Netfabb in Ultra quality, this is due the layers have to be thin enough to print out the small height differences designed in there so that you don't have the bearing stuck problem you just described :)
For US "makers", the necessary bearing is McMaster PN #7804K111 - $6.64/ea
I do like the design, but I object to the descriptor "fully printable", since it requires a bearing.
License

I think the stress relieve hole right above the bearing is far too big... the wall thickness at this point is 0.19mm, and virtually every slicer is omitting that section, rendering the bearing holder far less solid. I would reduce this whole to something very small, to leave some wall to be printed.