# Extruder with endstop

**URL:** <https://klipper.discourse.group/t/extruder-with-endstop/5491>\
**Category:** Developers\
**Created:** [December 21, 2022, 7:52pm UTC](https://klipper.discourse.group/t/extruder-with-endstop/5491 "2022-12-21T19:52:49Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![naikymen](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/naikymen/32/4241_2.png) [@naikymen](https://klipper.discourse.group/u/naikymen)\
**Post date:** [February 18, 2023, 2:17am UTC](https://klipper.discourse.group/t/extruder-with-endstop/5491/10 "2023-02-18T02:17:36Z")

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It seems that there is a lot to talk about 🙂

> [@themollusk](#):
>
> Is there anything else I’m missing?

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.

> [@themollusk](#):
>
> Just to give you an idea of what I’m doing, I’m building a multimaterial bioprinter.

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.

> [@themollusk](#):
>
> I’m currently trying to get it to work without step 2, but will eventually need to include it.

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](https://klipper.discourse.group/t/bug-extruder-re-activation-applies-the-incorrect-coordinate-system/6558/)

It can be patched though. I’m waiting for Kevin to share his thoughts.

> [@themollusk](#):
>
> Also, may I ask what you’re using your setup for?

Of course, it’s a “pipetting” robot for simple lab protocols: [Open Lab Automata / Pipetting Bot · GitLab](https://gitlab.com/pipettin-bot/pipettin-grbl)

Mainly micropipettes and tips instead of syringes. There are a few videos of it moving around (?)

> [@themollusk](#):
>
> Just wanna see how similar they are to see how much we could collaborate (If you’re interested, of course).

That would be lovely 🙂 let’s talk!

You may want to join Jubilee’s [lab automation channel](https://discord.com/channels/627982902738681876/741364565950070935) on Discord. We also can talk over there, and others will surely help.

Best and thanks for sharing too!

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