Help with first-time setup! I have built a Mendel90 Sturdy and I am having trouble setting it up properly. I am using a Azteeg X3 with a NZXT 650W 80+ Siliver PSU. I am having issues with the endstops. My endstops appear to be mounted in the maximum locations not the minimums. I had them wired as Normally Open at first but read that this isn't optimal for the safety of the machine. So I rewired them to NC. Either way they are wired I have had the issue of the board cutting all power when they are triggered. Now that they are wired NC they all have to be triggered to power on the board. In addition to that I don't know which stepping setting is optimal for my configuration. My steppers are the SD6128's that came with my board and are capible of 1/64 microstepping they are currently jumpered at 1/32. I was thinking of setting them to 1/16. Im a bit lost with these issues so if anyone else can share their advice and/or config files it would be greatly appreciated. Pictures of my Mendel90: [imgur.com] [imgur.com] https://reprap.org/forum/read.php?292,715782,715782#msg-715782 Sun, 15 Mar 2026 22:28:47 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?292,715782,717407#msg-717407 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,717407#msg-717407
No you don't need to manually home the machine before powering it up. Just make sure the X carriage is not on the far left. You can then home with the host and your slicer's start.gcode should contain a homing sequence so it homes before every build, see [github.com].

To convert the MIN endstops to MAX endstops you can swap the pins in pins.h so that the ones you want to use are on the screw terminals. For normal configuration it is just the Z switch that is MAX.

HOME_DIR is +1 to go towards MAX, -1 to go towards MIN and has to correspond with the switch input you are using. For X and Y you can using either MIN or MAX as long as they are both the same. Since the origin is in the centre of the bed on Mendel90 it makes little difference.

No you don't swap the MIN and MAX values. MIN should always be less than MAX. For Mendel90 the origin is in the middle so MIN = -100 and MAX = 100.]]> nophead Mendel90 Wed, 26 Oct 2016 07:02:18 -0400 https://reprap.org/forum/read.php?292,715782,717290#msg-717290 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,717290#msg-717290 Thanks to everyone for the help thus far!

- .Jata


Edit:

With what I stated above should these limits be the opposite of what they are? (ie. switch the values from (HOME_DIR 1 to HOME_DIR -1) and (from max 200 to min 200))

// ENDSTOP SETTINGS:
// Sets direction of endstops when homing; 1=MAX, -1=MIN
// :[-1,1]
#define X_HOME_DIR 1
#define Y_HOME_DIR 1
#define Z_HOME_DIR 1

#define min_software_endstops true // If true, axis won't move to coordinates less than HOME_POS.
#define max_software_endstops true // If true, axis won't move to coordinates greater than the defined lengths below.

// @section machine

// Travel limits after homing (units are in mm)
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS 200
#define Y_MAX_POS 200
#define Z_MAX_POS 200

Thanks again!]]> .Jata Mendel90 Tue, 25 Oct 2016 19:17:01 -0400 https://reprap.org/forum/read.php?292,715782,717001#msg-717001 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,717001#msg-717001 .Jata Mendel90 Mon, 24 Oct 2016 22:01:03 -0400 https://reprap.org/forum/read.php?292,715782,716864#msg-716864 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716864#msg-716864 github.com]]]> alkempster Mendel90 Mon, 24 Oct 2016 12:24:31 -0400 https://reprap.org/forum/read.php?292,715782,716676#msg-716676 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716676#msg-716676
Build options changed, rebuilding all
C:\Users\jata\Documents\Mendel90\Marlin-Marlin_v1_Mendel90\Marlin-Marlin_v1_Mendel90\Marlin\Marlin.ino:42:28: fatal error: LiquidTWI2.h: No such file or directory

#include LiquidTWI2.h

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.



Update: I don't get that issue when uploading the Marlin RC firmware..]]> .Jata Mendel90 Sun, 23 Oct 2016 19:40:17 -0400 https://reprap.org/forum/read.php?292,715782,716672#msg-716672 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716672#msg-716672 .Jata Mendel90 Sun, 23 Oct 2016 19:13:08 -0400 https://reprap.org/forum/read.php?292,715782,716512#msg-716512 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716512#msg-716512
Quote
.Jata
I don't mind it either way then. It just seemed like I was doing something wrong! lol

Would you recommend 1/16 or less?

Thanks!

I can only recommend 16 because that is the only setting I have tried with Mendel90. More microsteps will be quieter but the top speed will be less. Also a lot of boards have this problem [hydraraptor.blogspot.co.uk], which I fixed on the Melzis for the kits: [hydraraptor.blogspot.co.uk].]]> nophead Mendel90 Sun, 23 Oct 2016 05:33:33 -0400 https://reprap.org/forum/read.php?292,715782,716461#msg-716461 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716461#msg-716461 .Jata Mendel90 Sat, 22 Oct 2016 21:49:20 -0400 https://reprap.org/forum/read.php?292,715782,716457#msg-716457 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716457#msg-716457 .Jata Mendel90 Sat, 22 Oct 2016 21:36:51 -0400 https://reprap.org/forum/read.php?292,715782,716375#msg-716375 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,716375#msg-716375
Would you recommend 1/16 or less?

Thanks!]]> .Jata Mendel90 Sat, 22 Oct 2016 13:44:04 -0400 https://reprap.org/forum/read.php?292,715782,715896#msg-715896 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,715896#msg-715896
See [hydraraptor.blogspot.co.uk] for the rational for Z max.

See the manual for how to calibrate Z without running the head into the glass.

Setting the microstepping bigger than 16 may limit your top speed with an Atmega. I haven't tried it.]]> nophead Mendel90 Fri, 21 Oct 2016 04:17:07 -0400 https://reprap.org/forum/read.php?292,715782,715838#msg-715838 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,715838#msg-715838 .Jata Mendel90 Thu, 20 Oct 2016 21:42:56 -0400 https://reprap.org/forum/read.php?292,715782,715835#msg-715835 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,715835#msg-715835 Also is it odd that all of my endstop mountings seem to be where the maximum would be for each axis. Particularly the x-axis. I don't want to run the head into the printbed while calibrating the home point.]]> .Jata Mendel90 Thu, 20 Oct 2016 21:38:32 -0400 https://reprap.org/forum/read.php?292,715782,715819#msg-715819 Re: Help with first-time setup! https://reprap.org/forum/read.php?292,715782,715819#msg-715819 stephenrc Mendel90 Thu, 20 Oct 2016 19:00:26 -0400 https://reprap.org/forum/read.php?292,715782,715782#msg-715782 Help with first-time setup! https://reprap.org/forum/read.php?292,715782,715782#msg-715782 I am using a Azteeg X3 with a NZXT 650W 80+ Siliver PSU.
I am having issues with the endstops.
My endstops appear to be mounted in the maximum locations not the minimums. I had them wired as Normally Open at first but read that this isn't optimal for the safety of the machine. So I rewired them to NC. Either way they are wired I have had the issue of the board cutting all power when they are triggered. Now that they are wired NC they all have to be triggered to power on the board.
In addition to that I don't know which stepping setting is optimal for my configuration. My steppers are the SD6128's that came with my board and are capible of 1/64 microstepping they are currently jumpered at 1/32. I was thinking of setting them to 1/16.

Im a bit lost with these issues so if anyone else can share their advice and/or config files it would be greatly appreciated.

Pictures of my Mendel90:

[imgur.com]

[imgur.com]]]> .Jata Mendel90 Thu, 20 Oct 2016 16:59:47 -0400