Snapmaker J1 PTFE Guide

I like the original model, but I thought there could be some small improvements.  I didn't like that I needed to stop the print to add the bearings.  I also thought the original print was a little too loose when installed.  There was also a small gap between the extruder and the original, which could cause a problem when printing TPU.

This model does the following:

1. Allows you to print the whole part then slide the bearings on rather than stopping the pint to install them.
2. It's a little tighter tolerance because I was noticing some movement in the original which I thought could lead to excessive wear.
3. There was a small gap between the guide and the extruder, which may have caused some TPU jams.

This should be printed in ABS or PETG.  ASA and PLA are too brittle to work properly.