Auto bed leveling without X and Y endstops

Hi

I got an inductive sensor installed on our printer.

It is a basic SN04-N which works surprisingly well, however we can only home Z.

G29 does not work because if requires to home X and Y before Z, and we cannot do that without endstops.

We are using the printer without endstops since the beginning, and are happy that way.

What can we do to bypass this step?

J3d

Edited 1 time(s). Last edit at 05/15/2018 02:59PM by J3d.

Read Below

Using Manual Bed Leveling and Mesh Bed Leveling

[github.com]

OR

* The "Manual Probe" provides a means to do "Auto" Bed Leveling without a probe.
* Use G29 repeatedly, adjusting the Z height at each point with movement commands
* or (with LCD_BED_LEVELING) the LCD controller.
*/
//#define PROBE_MANUALLY

[marlinfw.org]

Edited 1 time(s). Last edit at 05/15/2018 03:46PM by Roberts_Clif.

You can do G28 with jumpers on the XY-endstop terminals. ( between signal and GND )
The steppers will then only move 5mm away from the home position, like it would for slow 2nd. homing. You can set XY-homing position to 5 in FW to compensate.

Hi,

Thank you for answering and suggesting solutions

@o_lampe: with jumpers on the XY terminals the G28 made the steppers move 5mm as you said and then the z-homing began but it only kept moving along the positive X and Y axis (probably because the X and Y endstops were always triggered), is it because I have options elsewhere in Marlin which are not correct?

@Roberts_Clif: I am going to try your approach

J3d

I ended up installing X & Y endstops and now everything works

Quote
J3d
I ended up installing X & Y end-stops and now everything works

Good going! You are becoming a 3D Printing engineer.

Yes, we learn every time a little bit more

We still have not solved the adhesion issue though: even with kapton tape we still need ABS juice otherwise it does not stick

Currently print in PLA, Have tried printing on many different types of Bed surface materials.

Print on Vinyl Transfer Paper Tape (Looks like a cream colored sheet of paper with a post-it style backing. (Surface smooth, unlike blue painters tape that is textured)
This has been the best material used. Inexpensive comes in widths to cover the bed in one pass and comes with different adhesion's low, medium and high tack.
Have printed many models on a single application. (Cons: Tears easily, sticks to model, though easily cleans with windows cleaner)

Using Z-Offset to set the nozzle height
In Marlin Click menu
select Control Click
select Motion Click
select Z-Offset and change the offset.

3D Printed an adjustable Proximity sensor mount that make adjusting the bed height a breeze.
Used in conjunction with Z-Axis babystepping have rarely printed a bad model. (Con: have to be in front of 3D Printer to use)

I have some of this vinyl tape and will give it a try, thanks @Roberts_Clif