*Klipper Newbie* Error:Invalid homing_positive_dir / position_endstop in 'stepper_x'

General Discussion
1

Basic Information:

Printer Model: RatRig legacy V-core 3.0
MCU / Printerboard: Bigtreetech Octopus 1.1
klippy.log
klippy.log (557.5 KB)

Describe your issue:

Brand new user of Klipper but not new to 3d printing. Need a config. fix for this Klipper error: Invalid homing_positive_dir / position_endstop in ‘stepper_x’
Thanks in advance.
Also, any information on configuring this printer:

-with a Pyr0-piezo circuit using the tip of the syringe as the probe.

Stay tuned…Thanks!

2

Hello @batteau62 !

You set position_endstop to 0

And this is the note to

#homing_positive_dir:
#   If true, homing will cause the stepper to move in a positive
#   direction (away from zero); if false, home towards zero. It is
#   better to use the default than to specify this parameter. The
#   default is true if position_endstop is near position_max and false
#   if near position_min.

If you endstop is 0 and homing_positive_dir is True, the head will move away from the endstop.

This will not work.

https://www.klipper3d.org/Config_Reference.html#stepper

3

Hello! Thanks for the answer EddyMI3D, but the “printer.cfg” that I have open, doesn’t show a parameter for homing position dir? Here’s a copy of the config file.
printer.cfg (14.0 KB)

4

Your config consists of several files.
Quite confusing for a newbie.
The parsed config in the klippy.log does not contain hints from what files the sections are taken.

The parsed section of stepper_x looks like this:

[stepper_x]
step_pin = x_step_pin
dir_pin = x_dir_pin
enable_pin = !x_enable_pin
rotation_distance = 40
microsteps = 16
homing_speed = 50
homing_retract_dist = 5.0
position_max = 400
position_endstop = 0
endstop_pin = ^x_endstop_pin
homing_positive_dir = True

You may check this files:

RatOS/printers/v-core-pro/steppers.cfg
RatOS/printers/v-core-pro/400.cfg

Such configs are really advanced stuff.
To learn how Klipper works, you may look into the files and check their meanings with this:

https://www.klipper3d.org/Config_Reference.html

5

Thanks again! I checked the two paths you mentioned. Neither has a direction parameter?
They are identical to your parsed example of stepper x above, except these two:
endstop_pin = ^x_endstop_pin
homing_positive_dir = True
Frustrating! I’ll keep looking, again thanks a million. Probably see me again for some of the mod configs :exploding_head:

6

Possible bug?
In my Klipper config, the path:
/config/RatOS/printers/v-core-3
file:
physical-endstop-x.cfg
does not have a parameter for dir? But the physical-enstop-y.cfg does?
I added them into the overrides, with a dir for x, and that seems to have fixed the error…
But of course another error popped up:
“Option ‘filament_diameter’ in section ‘extruder’ must be specified”
I have added what I thought was relevant to the overrides, but no joy…(.cfg attached)

This is my first build of a liquid deposition printer, so here’s a little info on this project. This is a mod of a RatRig 400mm v-core 3.0 to print condensation cure silicone. As I mentioned in my first post. It uses a syringe(cold paste) extruder, with a non captive size 23 Haydon Kerk Motion Solutions 57mm stepper motor linear actuator. (See the link in first post for specs) There will not be a hotend or heated bed. In the past when I have played with “cold” extrusion. The firmware always throws errors of safety protocols for thermal runaway. Like “no thermistor detected, startup cancelled” Any insights on config for this subject?
I know it will require a custom extruder config also. Is there a generic template for “extruder” in Klipper?
I haven’t received it yet, but the plan is to use a “Pyr0-piezo” as a tool z-probe for the syringe tip. When the reservoir is changed, the tip location changes.
A BLTouch will be used to level the bed.

printer (2).cfg (14.8 KB)

Again, thanks for any and all help/opinions/insights for this project :robot:

7

I can only recommend to get rid of the RatOS config:

  1. Start Klipper and create a klippy.log
  2. Copy the config as parsed by Klipper from the log.
  3. Paste the content in a new printer.cfg

Start modifying from there.

8

Set

min_temp=-273.15 
min_extrude_temp=-273.15
max_temp=99999999

Edit:
Another quite simple solution to such a problem is to wire up a thermistor and have it measure room temperature.