<p>The steps per mm in firmware is the link to the hardware configuration/setup. Reducing by half must reduce Z advance by half. If your prints are twice as tall, you must have serious under-extrusion problems as when the printer is laying down molten filament for e.g. a 0.2 mm layer, in effect this is a 0.4 mm layer. If this is not the case, you should also <a href="https://3dprinting.stackexchange.com/questions/6483/how-do-i-calibrate-the-extruder-of-my-printer">calibrate the extruder</a>.</p>

<p>Please re-calibrate your machine Z axis in firmware (most firmwares allow command <a href="https://reprap.org/wiki/G-code#M92:_Set_axis_steps_per_unit" rel="nofollow noreferrer"><code>M92</code></a> to set the steps per mm), not in Simplify3d, and then the extruder.</p>

CC BY-SA 4.0
2018-12-29T12:05:22.393Z
That's right. The point is that Z axis and the extruder calibration are very related to one another. My printer works fine right now. Thank you.
2012User
CC BY-SA 4.0
2018-12-29T00:08:34.860Z
2018-12-29T00:22:55.483Z
2018-12-29T00:22:55.483Z
0scar
<p>I'm using Simplify3d and a DIY 3D printer. The printer works fine and I've printed very nice objects with very smooth and beautiful surfaces BUT they are twice as tall as they should be! It is like they're scaled double in Z axis! I've checked everything, I changed steps/mm from 4000 to 2000 but it ruined the smooth surface. changing layer height just makes smoother surface and doesn't solve the problem. What am I missing in the settings?
<a href="https://i.sstatic.net/Cs6KO.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Cs6KO.jpg" alt="on the left is printed after changing step/mm from 4000 to 2000 (almost correct height) and on the right is printed with 4000 step/mm twice as tall! "></a></p>

CC BY-SA 4.0
2018-12-29T00:09:38.330Z
Please add photos of the prints.
0scar
<diy-3d-printer><calibration><z-axis>
Calibration of Z axis in Simplify 3D
2012User
# Calibration of Z axis in Simplify 3D

(Asked by: username_0 on 2018-12-28)

I'm using Simplify3d and a DIY 3D printer. The printer works fine and I've printed very nice objects with very smooth and beautiful surfaces BUT they are twice as tall as they should be! It is like they're scaled double in Z axis! I've checked everything, I changed steps/mm from 4000 to 2000 but it ruined the smooth surface. changing layer height just makes smoother surface and doesn't solve the problem. What am I missing in the settings?
[![on the left is printed after changing step/mm from 4000 to 2000 (almost correct height) and on the right is printed with 4000 step/mm twice as tall! ](https://i.sstatic.net/Cs6KO.jpg)](https://i.sstatic.net/Cs6KO.jpg)

**Tags:** diy-3d-printer, calibration, z-axis

> **Comments:**
> **username_1**: Please add photos of the prints.  

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## 1 answers

### Answer by username_1 on 2018-12-29. Score: 1 | Accepted answer

The steps per mm in firmware is the link to the hardware configuration/setup. Reducing by half must reduce Z advance by half. If your prints are twice as tall, you must have serious under-extrusion problems as when the printer is laying down molten filament for e.g. a 0.2 mm layer, in effect this is a 0.4 mm layer. If this is not the case, you should also [calibrate the extruder](https://3dprinting.stackexchange.com/questions/6483/how-do-i-calibrate-the-extruder-of-my-printer).

Please re-calibrate your machine Z axis in firmware (most firmwares allow command [`M92`](https://reprap.org/wiki/G-code#M92:_Set_axis_steps_per_unit) to set the steps per mm), not in Simplify3d, and then the extruder.

> **Comments:**
> **username_0**: That's right. The point is that Z axis and the extruder calibration are very related to one another. My printer works fine right now. Thank you.  

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