Hot-End Does Not Automatically Move Towards It's Contact Points; Excessive Friction Of Hot-End With Extruder Body; After An Upgrade The Hot-End Dimensions Are Not Correct; Production Error, With Too Tight Tolerances In Either Extruder Or Hot-End - Felix printers Pro Series Troubleshooting Manual

Felix Pro L/XL Troubleshooting guide
7
December 10, 2019,

4.7 Hot-end does not automatically move towards it's contact points.

In some cases the hot-end cannot move downwards. The causes including fix are:

4.7.1 Excessive friction of hot-end with extruder body

The body of neck of the hot-end touches the extruder assembly. You can see this if there are some markings on
the hot-end neck. Most likely the hot-end dimensions are out of spec.

4.7.2 After an upgrade the hot-end dimensions are not correct.

To compensate for production tolerances, shims are used between the disc and cooling ribs and between bearing
and cooling ribs.

4.7.3 Production error, with too tight tolerances in either extruder or hot-end

The hot-end must comply to these measurements. In order for proper operation.

4.7.4 Scratches or dents on magnets or on extruder disc.

In some cases there could be a dent/bulge on the hot-end disc and on the magnets causing excessive friction.
To fix this issue, please inspect the surfaces for damage and replace the elements.

4.7.5 Hot-end still not comes back.

If above steps don't work, a little bit of grease on the magnet can provide a solution. It significantly lowers friction.
Put a very small amount of grease on the magnet indicated below to significantly lower friction. Do this with a q-
tip. Grease type: Thick grease (Ball bearing grease)
www.FELIXprinters.com
FELIX Pro series