First few layers purge interfers with the bed on mk3s.

Heres what i mean. What do i change in my tool change gcode?

Just add a Z hop (e.g. "G1 Z40 F10000") if the current height is less than the minimum height to clear the bed.

[postquote quote=594][/postquote]

Exactly!
15mm is the maximum amount we use in the gcode generated by SimplyColor3D. Specifically for Prusa i3 MK3S.
Then we reduce that value with every layer by the layer thickness so as to use the least amount of time possible for purging.
Those z moves aren't free 😉

@bigbrain3d

Where is the gcode I need to use this with my prusa MK3s.  

@gysnst2

All of the gcode, files, and instructions you should need are here.

The purge mechanism was thoroughly tested on the MK3s so this should work for your printer too.