How to set the Z axis home? Hello All I have been wondering for some time now how one would go about homing the Z axis... or at lease setting the Z-Axis home in the first instance. I had imagined the home position would place the nozzle over the cut-out in the bed to prevent a head crash. It turns out this is not so. Further, the Z axis will not move into negative territory (i.e. lower than home) so I am guessing Home will have to be just touching the bed. Is this correct? Thanks https://reprap.org/forum/read.php?151,69145,69145#msg-69145 Mon, 13 Apr 2026 00:51:18 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?151,69145,126718#msg-126718 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,126718#msg-126718
Quote

I have looked at the calibration scripts out of RepG and it looks like G92 is the key but sending G92 Z0.0 then sending it home and sending it to 0 (G1 Z0 F1800.000) doesn't seem to have the desired effect.

A G1 Z0 after a G92 Z0 has no effect by design. G92 sets the position to wherever you are and going to Z0 after that ... well, you're already there. What you probably want is a G92 Z25 and G1 Z0.

Quote

how do I save the new value to eeprom such that it keeps it through the next cold start?

You don't. Turning the controller off makes it loosing the knowledge about its position, so it doesn't know where to move to go to zero. That's why you have to find the endstops after each power cycle.]]> Traumflug General Mendel Topics Sat, 31 Mar 2012 07:54:43 -0400 https://reprap.org/forum/read.php?151,69145,126678#msg-126678 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,126678#msg-126678 brnrd General Mendel Topics Fri, 30 Mar 2012 17:33:36 -0400 https://reprap.org/forum/read.php?151,69145,126675#msg-126675 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,126675#msg-126675
I have googled everything I can think of to get the answer but it seems to be one of those magic things that everyone but me just knows.

I'm running kliment-Sprinter-52f7f30.

I have looked at the calibration scripts out of RepG and it looks like G92 is the key but sending G92 Z0.0 then sending it home and sending it to 0 (G1 Z0 F1800.000) doesn't seem to have the desired effect.

Plus, how do I save the new value to eeprom such that it keeps it through the next cold start? The RepG script uses M131 but Kliment-Sprinter doesn't implement M131.

Thanks for your help,

DougM]]> dougm General Mendel Topics Fri, 30 Mar 2012 16:55:22 -0400 https://reprap.org/forum/read.php?151,69145,80035#msg-80035 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,80035#msg-80035 Matthieu General Mendel Topics Sat, 09 Apr 2011 04:39:18 -0400 https://reprap.org/forum/read.php?151,69145,78392#msg-78392 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,78392#msg-78392
You might want to check reproducibility by raising, homing and nudging your z-axis a few times and checking with the paper. You might also want to move the x and y around. Perhaps something is loose.

I like to print a single-walled square object with a skirt (or outline) option turned on in skeinforge. Then I can use the outline to measure the actual layer thickness and make fine adjustments if needed. If it's too thick, you can make the adjustment by software in Skeinforge bottom option by changing the Altitude to the difference of the set layer thickness and the extruded plastic. Some people like to extrude the first layer at a fraction of the layer thickness to make sure the plastic sticks to the bed. I prefer to have the same thickness from the first layer.]]> brnrd General Mendel Topics Sun, 27 Mar 2011 08:07:03 -0400 https://reprap.org/forum/read.php?151,69145,78379#msg-78379 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,78379#msg-78379
Thank you for replying to AgeingHippy above, I had the same issue and I have now carefully calibrated my Z-axis home position to be 1-sheet above the bed plate and carefully checking that it is level XY-wise.

Alright, then I turn on the machine, I do a few tests on the extruder, then back to "home" again to prepare for printing, and there all hell break loose. My aluminium plate has moved a little bit possibly, or I was not exactly in "blocked" position for the Z-optoswitch when I did the calibration in the first place. Result is either an extrudeur a few mm above the plate or a big crash into the bed.

So my question is how do you actually calibrate the Z axis endstop ? Do you play on the optoswitch position, higher or lower with maybe a few washer ? Or do you play with the Z elevation of the bed ? Or with the aluminium thin plate that goes into the optoswitch ?

Thanks for the help

Matthieu]]> Matthieu General Mendel Topics Sun, 27 Mar 2011 05:22:38 -0400 https://reprap.org/forum/read.php?151,69145,72759#msg-72759 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,72759#msg-72759 brnrd General Mendel Topics Sun, 06 Feb 2011 01:47:06 -0500 https://reprap.org/forum/read.php?151,69145,69275#msg-69275 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,69275#msg-69275
I set mine so I can slide a peice of paper with some drag beween the nozzle and the bed..As for leveling I just move the x/y to diffrent places and use the paper under he nozzle, after a few mins you should be setup.

Auzze]]> Auzze General Mendel Topics Thu, 30 Dec 2010 14:42:48 -0500 https://reprap.org/forum/read.php?151,69145,69266#msg-69266 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,69266#msg-69266
Does the first layer then get printed at the Z=0 home position?

Cheers]]> AgeingHippy General Mendel Topics Thu, 30 Dec 2010 10:11:23 -0500 https://reprap.org/forum/read.php?151,69145,69257#msg-69257 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,69257#msg-69257 Andrew Smith General Mendel Topics Thu, 30 Dec 2010 07:37:49 -0500 https://reprap.org/forum/read.php?151,69145,69241#msg-69241 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,69241#msg-69241
I wonder where to set the Z home position. Is it where the nozzle just touches the bed?

Cheers]]> AgeingHippy General Mendel Topics Thu, 30 Dec 2010 06:12:29 -0500 https://reprap.org/forum/read.php?151,69145,69151#msg-69151 Re: How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,69151#msg-69151
A common microswitch can be used to set the specific height, at least that is what i'm going to use.

Use the MIN endstop as the input to the stepper driver.]]> Grogyan General Mendel Topics Tue, 28 Dec 2010 17:23:28 -0500 https://reprap.org/forum/read.php?151,69145,69145#msg-69145 How to set the Z axis home? https://reprap.org/forum/read.php?151,69145,69145#msg-69145
I have been wondering for some time now how one would go about homing the Z axis... or at lease setting the Z-Axis home in the first instance.

I had imagined the home position would place the nozzle over the cut-out in the bed to prevent a head crash. It turns out this is not so.

Further, the Z axis will not move into negative territory (i.e. lower than home) so I am guessing Home will have to be just touching the bed. Is this correct?

Thanks]]> AgeingHippy General Mendel Topics Tue, 28 Dec 2010 16:14:39 -0500