Hi I am new to RepRap and have built a prusia i3 rework, ramps 1.4 and audino mega I need to get the extruder as close as possible to the bed To do this I want to offset the nozzle in the original Marlin upload as I cannot move my endstops higher than they are. I have a minimum endstop set up which th nozzle reaches about 2mm above the bed. I am unsure on what to uncode/ change in the configuration tab to do this I am using Pronterface. If there is a guide on how to do this I would love to find out because then I can start printing! Many thanks https://reprap.org/forum/read.php?4,633625,633625#msg-633625 Wed, 07 Oct 2026 21:23:22 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,633625,634704#msg-634704 https://reprap.org/forum/read.php?4,633625,634704#msg-634704 IMBoring25 Reprappers Thu, 03 Mar 2016 07:36:52 -0500 https://reprap.org/forum/read.php?4,633625,634567#msg-634567 https://reprap.org/forum/read.php?4,633625,634567#msg-634567 tjnamtiw Reprappers Wed, 02 Mar 2016 23:19:31 -0500 https://reprap.org/forum/read.php?4,633625,634073#msg-634073 https://reprap.org/forum/read.php?4,633625,634073#msg-634073
#define Z_MIN_POS 0

to something like

#define Z_MIN_POS 2

to whatever your residual gap is. This will tell the printer that when the homing is complete it is at position 2mm or whatever you end up using. Then to quickly check it out you can manually move to 0 and see if the height is correct. You want a piece of paper to slide under the nozzle with just a bit of friction.

You'll edit that setting in the configuration.h file of the marlin firmware using arduino software. Then compile and upload to the electronics. This assumes of course that you have a copy of Marlin that has all of your other settings already adjusted and you only need to change the height of your homing position. It is possible that you can change that setting using a GCode command or through Pronterface but I don't know how to do that. I'm not real familiar with Marlin so hopefully that helps.]]> bryanandaimee Reprappers Tue, 01 Mar 2016 18:01:38 -0500 https://reprap.org/forum/read.php?4,633625,633625#msg-633625 https://reprap.org/forum/read.php?4,633625,633625#msg-633625
I am new to RepRap and have built a prusia i3 rework, ramps 1.4 and audino mega

I need to get the extruder as close as possible to the bed

To do this I want to offset the nozzle in the original Marlin upload as I cannot move my endstops higher than they are. I have a minimum endstop set up which th nozzle reaches about 2mm above the bed.

I am unsure on what to uncode/ change in the configuration tab to do this I am using Pronterface.

If there is a guide on how to do this I would love to find out because then I can start printing!

Many thanks]]> J_walsh Reprappers Mon, 29 Feb 2016 18:32:50 -0500