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docs: Clarify the Thickness of Paper 

Signed-off-by: Yifei Ding <yifeiding@protonmail.com>
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Yifei Ding 2021-12-21 20:30:33 -08:00 committed by KevinOConnor
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docs/Bed_Level.md
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@ -63,7 +63,7 @@ test".
In order to perform the paper test, cut a small rectangular piece of In order to perform the paper test, cut a small rectangular piece of
paper using a pair of scissors (eg, 5x3 cm). The paper generally has a paper using a pair of scissors (eg, 5x3 cm). The paper generally has a
width of around 100 microns (0.100mm). (The exact width of the paper thickness of around 100 microns (0.100mm). (The exact thickness of the paper
isn't crucial.) isn't crucial.)
The first step of the paper test is to inspect the printer's nozzle The first step of the paper test is to inspect the printer's nozzle
@ -74,7 +74,7 @@ or bed.
If one always prints on a particular tape or printing surface then one If one always prints on a particular tape or printing surface then one
may perform the paper test with that tape/surface in place. However, may perform the paper test with that tape/surface in place. However,
note that tape itself has a width and different tapes (or any other note that tape itself has a thickness and different tapes (or any other
printing surface) will impact Z measurements. Be sure to rerun the printing surface) will impact Z measurements. Be sure to rerun the
paper test to measure each type of surface that is in use. paper test to measure each type of surface that is in use.
@ -89,11 +89,11 @@ temperature!**
When the nozzle is heated, its position (relative to the bed) changes When the nozzle is heated, its position (relative to the bed) changes
due to thermal expansion. This thermal expansion is typically around a due to thermal expansion. This thermal expansion is typically around a
100 microns, which is about the same width as a typical piece of 100 microns, which is about the same thickness as a typical piece of
printer paper. The exact amount of thermal expansion isn't crucial, printer paper. The exact amount of thermal expansion isn't crucial,
just as the exact width of the paper isn't crucial. Start with the just as the exact thickness of the paper isn't crucial. Start with the
assumption that the two are equal (see below for a method of assumption that the two are equal (see below for a method of
determining the difference between the two widths). determining the difference between the two distances).
It may seem odd to calibrate the distance at room temperature when the It may seem odd to calibrate the distance at room temperature when the
goal is to have a consistent distance when heated. However, if one goal is to have a consistent distance when heated. However, if one
@ -180,7 +180,7 @@ command to exit the calibration tool.
After successfully performing bed leveling, one may go on to calculate After successfully performing bed leveling, one may go on to calculate
a more precise value for the combined impact of "thermal expansion", a more precise value for the combined impact of "thermal expansion",
"width of the paper", and "amount of friction felt during the paper "thickness of the paper", and "amount of friction felt during the paper
test". test".
This type of calculation is generally not needed as most users find This type of calculation is generally not needed as most users find