# Why does an .2mm initial layer measure .4mm +?

**URL:** <https://forum.snapmaker.com/t/why-does-an-2mm-initial-layer-measure-4mm/20959>\
**Category:** Snapmaker 2.0 (3-in-1)\
**Created:** [September 19, 2021, 9:38pm UTC](https://forum.snapmaker.com/t/why-does-an-2mm-initial-layer-measure-4mm/20959 "2021-09-19T21:38:11Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![scyto](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/scyto/32/13938_2.png) [@scyto](https://forum.snapmaker.com/u/scyto)\
**Post date:** [September 19, 2021, 10:33pm UTC](https://forum.snapmaker.com/t/why-does-an-2mm-initial-layer-measure-4mm/20959/3 "2021-09-19T22:33:10Z")

</div>

> [@brent113](#):
>
> the gcode calling for

most definitely .2

this is the start of the skirt

```auto
;Start GCode end
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
; Filament gcode
;LAYER_CHANGE
;Z:0.2
;HEIGHT:0.2
G1 E-1.00000 F3900.000
G92 E0
G1 Z0.200 F9000.000
G1 X159.072 Y274.581
G1 E1.00000 F2400.000
;TYPE:Skirt
;WIDTH:0.42
G1 F900.000
G1 X160.348 Y275.020 E1.04230
G1 X161.496 Y275.728 E1.08461
G1 X162.463 Y276.669 E1.12691

```

this is the start of the object preimter

```auto
;TYPE:Perimeter
G1 F900.000
G1 X157.044 Y292.151 E1.34171
G1 X161.575 Y292.149 E1.48378

```

start of object external perimiter

```auto
;TYPE:External perimeter
G1 F900.000
G1 X162.161 Y291.772 E1.14862
G1 X157.425 Y302.181 E1.50717
G1 X157.431 Y315.364 E1.92053

```

start of the infill

```auto
;TYPE:Solid infill
;WIDTH:0.420472
G1 F900.000
G1 X156.757 Y281.961 E1.02619
G1 X156.757 Y282.495 E1.04296

```

there is no change in z height until we get to gcode end

not only is the object 0.4m high, extrusion is shit, here are many i have printed (not all in the same location) - i have tried changing just about everything (nozzle temp from 180 to 240, bed temps, recalibration, lowering z offset, trying 0.4mm size object and 0.4mm extrusion height.

Note this is absolutely related to the xy coords of the object on the bed and is IDENTICAL on a glass surface, the snapmaker stock surface & and an energetic PEI smooth plate too. [aka this thread](https://forum.snapmaker.com/t/is-a-consistent-first-layer-across-whole-of-a350-build-plate-actually-possible/20740/29) (thanks to @Artezio for all his help, and just plain listening to my crazy!) io should note the 'good squares in the 5x5 matrix are ~0.22mm - aka what I would expect.

i cut the model to be just the top center square to speed up testing iterations.

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