Installing an Endstop on a RAM extruder.

reFlexlab

https://www.bryancera.com/cerastruder

Hello Everybody,

We are currently developping an Open source ceramic extruder compatible and optimized with Duet firmware, It would be perfect to have an endstop at the bottom of the cartridge in order to automatically control the refilling.

How would you proceed in order to add an endstop and to control E accordingly.

I though of a using the filament sensor capabilities or maybe some MetaCommands along with a custom sensor would do the job

What do you think ?

dc42

Currently the only extruder "endstop" type supported is stall detection. If that is not suitable then you would need to configure the extruder motor as both an extruder and an extra axis, so that you can command it like an axis with an endstop when refilling.

reFlexlab

Thank you

reFlexlab

@dc42 Hello As I can see it is possible to trigger the rehome.g file after the detection of a motor stall .

M915 Pnn Sn Fn Rn
R parameter
3 = pause print, execute /sys/rehome/.g, and resume print

Is it possible to execute another .g file or just a macro ?

Thank you,
Tom

reFlexlab

What about this command https://duet3d.dozuki.com/Wiki/Gcode#Section_M577_Wait_until_endstop_is_triggered

oliof

Why not use an external trigger? https://duet3d.dozuki.com/Wiki/Gcode#Section_M581_Configure_external_trigger

gcorthey

@dc42 said in Installing an Endstop on a RAM extruder.:

need to configure the extruder motor as both an extruder and an extra axis,

How can I configure the extruder motor as an extra axis with endstop?

droftarts

@gcorthey As @dc42 said:

configure the extruder motor as both an extruder and an extra axis, so that you can command it like an axis with an endstop

eg

M584 X0 Y1 Z2 U3 E3 P3

This defines driver 3 as an axis (U) and as an extruder. You need to add values for U to M350, M92 M566, M203, M201 and M906. Probably best to copy the values for the U axis from the E axis. Add an M574 line for the endstop on the U axis, eg M574 U1 S1 P"io5.in" to config.g

When you need to use the U axis, send M584 P4 to show the U axis, home it, then hide it again with M584 P3.

It is probably better to start a new thread than resurrect a thread that is over 2 years old!

Ian