It seems that there is a lot to talk about 
Is there any useful info in the logs? All the configs must be updated to match your pins. The current pin names are specific to my setup; a couple Arduino CNCshields.
If it’s all right with you we can chat by PMs - to solve the issue and avoid cluttering the thread.
We can share the solution here later on.
It looks great! I wanted to reuse a 3D-printer for that but wasn’t convinced by the moving bed.
What are you printing?
I wanted to try painting on YPD plates with my yeasts for fun.
I think you can use the extruder homing feature for endstop 2 (the lower one).
My fork will do CNC-style probing too, so you can try use endstop 1 (the top one) as a regular “probe”.
Know that there are “upstream” issues in Klipper with absolute extrusion and tool-changing; this means that the “0” origin of the extruder will not be very useful for now. For details see: Bug: extruder [re]activation applies the incorrect coordinate system
It can be patched though. I’m waiting for Kevin to share his thoughts.
Of course, it’s a “pipetting” robot for simple lab protocols: Open Lab Automata / Pipetting Bot · GitLab
Mainly micropipettes and tips instead of syringes. There are a few videos of it moving around (?)
That would be lovely let’s talk!
You may want to join Jubilee’s lab automation channel on Discord. We also can talk over there, and others will surely help.
Best and thanks for sharing too!