The gap distance between the nozzle zero position and the bed will be mostly influenced by how well the filament sticks to the bed. With my latest filament, it needs to be pushed right into the bed to prevent warping and lifting around the edges. I think as long as the first layer goes down ok, you are good to go, Getting the exact gap distance to match the nozzle is not vital, subsequent layers will be correct anyway.

Basically, all the settings listed with the M501 g-code command can be set the same way as the home offset.

The Mendel90 is a nice printer, a good design, it should serve you well.

Mark.

Also can we also store the E_STEPS_PER_MM value, for example M92 Ennn.nn then M500 ?

You will need to explain how far you have got with the firmware configuration, and have you connected to the firmware from the PC with software such as Pronterface or Cura. The firmware may not allow the stepper motors to run if there is no hot end temperature sensor connected. Also, the stepper motors will not operate properly if the end stops are not configured correctly.

It might take a few posts to get you sorted and it might be better to post your question on 3D Printing google group for faster response; link below.
https://plus.google.com/u/0/communities/117814474100552114108

I’ve not tried using the 3 wire load cells yet but I believe you have the half bridge type.

To use the circuit in this article, you will need to convert your load cell to a full bridge. The links below point to discussions about converting a 3 wire half bridge load cell to a 4 wire full bridge load cell.

The software for the Arduino outputs grammes but the code can easily edited to output Kg instead, I can help with that when you are ready.

http://www.electro-tech-online.com/threads/3-wire-load-cell-question.32536/
https://forum.allaboutcircuits.com/showthread.php?t=84383

Mark

sir, I really don’t know much about,
I use the combination of 3 wires load cell (Red, White and Black wire) which give out 4 pin labelled as S+ S- E+ E-

I want these 4 pin into INA125P , as Vout from INA125P connect to arduino Uno to convert the value to kilograms as I want to calculate the people weight..

Kindly need your help sir…

Ammar

You could use any load cell I guess, the issue you will have is the final measuring resolution after calibration. 180KG load cell might have a resolution of around 200grams through an 10bit analogue microcontroller input such as on the Arduino UNO. The Teensy 3.1 microcontroller will provide better resolution; High Resolution Analog Inputs (13 bits usable, 16 bit hardware).

If you need better resolution than what can be provided by the microcontrollers, try the 24bit HX711 Dual-Channel Weighing Sensor Module. The reads will be much slower, but fast enough if you are just weighing stuff.

Mark