UM3 dips on pool at extruder change

[swordriff 119]

Hey! A similar issue was with the Um2 sometimes, after priming the extruder, it would fully, and confidently dip its nozzle into the pool of extruded primer material, and carry it to the print.

I now am the lucky owner of an UM3, and the print quality is outstanding, except when changing extruder, it decides to dip its hot end into the priming pool, hitting it with the low roof, and sometimes carry it and deposit it sometimes in the middel if the print.

How can this be necessary?

Here is suggested formula:

After priming ext 2 at extruder change, if (current_buildheight + 5mm) is equal to or smaller than max_buildheight, THEN move Z down 5 mm ( to avoid the pool) and continue printing after moving the Z back up.

(Btw; it is not necessary to heat up, or cool down or anything else in this process).

Edited February 27, 2017 by Guest

[gr5 2,172]

I heard this was fixed in a very recent version of jedi-marlin (the firmware) (today is feb 27 2017). But I don't think it's the normal version - I think it's the developer version or something. Can anyone else answer this?