<p>There are numerous topics found on first layers that do not adhere properly causing prints to fail or cause print quality defects.</p>
<p>The advice is often to properly level or tram the build surface. How does one tram the build surface?</p>

Definition of leveling
Tramming, often referred to as "leveling" in the 3D printer world ("tramming" and "leveling" is used interchangeably, but "tramming" is the correct nomenclature), is the process of creating a 2D
plane
of the build surface that is parallel to the nozzle at the whole print area (usually the X-Y plane).
Why tramming?
In order to adhere the hot filament from the nozzle it is essential that the distance between the nozzle and the build surface is as constant as possible. Increase of the gap may cause the filament to not be squished enough and it may be dragged instead of deposited or create an insufficient bond to cause problems later in the print job when e.g. shrinkage of the object comes in play.
How to tram the surface?
To tram the build surface (a build surface comes in many shapes and forms, sheet of glass, bare aluminum plate, some sort of coated heated surface, etc.) most printers are equipped with at least three so-called "leveling screws". Why at least three? It takes a minimum of three screws to fixate a plane in space, more screws cause the bed to be over-defined or indeterminate, but with a flexible build surface it is quite common to have 4 screws although it is causing a
statically indeterminate system
. So, these screws need to be adjusted as such that the build surface if parallel to the nozzle.
First step is to home (
What is homing? What is the purpose of homing?
) the printer,
homing
from the
tag wiki
reads:
The process of determining the location of a 3D printer nozzle in
three dimensions using a reference point (home location) is referred to
as "homing". Homing should occur before every print and involves
bringing the X, Y and Z-Axis motors to pre-defined limit locations
(usually these are endstops). Pre-recorded homing data offset values
determine the position of the build plate origin with respect to the
endstop locations.
Once homed (with G-code
```
G28
```
or through the graphical user interface of the printer display) , the origin (0, 0, 0) of the printer is known, from this origin you can determine the level. Note that the X and Y is usually correct (if not, see
How to center my prints on the build platform? (Re-calibrate homing offset)
) the Z offset depends on the height of the Z endstop and the leveling screws. For a surface that uses a sensor as endstop (see e.g.
Automatic Bed Leveling (ABL) with a sensor (BLTouch, inductive, capacitive), how does it work?
) the offset is defined by G-code (
```
M851
```
) or through the user interface of the printer display. Note that automatic bed leveling (ABL) is not magic, you still need to provide a trammed bed that is as level as possible, the sensor merely scans the surface and adjusts for larger imperfections of the build surface. After homing, move the nozzle at a certain Z value to the corner of the origin, which is usually the front left) (0, 0, Z) or close to this corner (10, 10, Z), put a piece of paper (A4/Letter) on the build surface and lower the Z to 0 (or if you hit the build surface before you reach zero height, then lower the build surface) raise the build surface until you can feel the the paper drag slightly when pulled between the nozzle and build surface (alternatively you can use a feeler gauge, A4 paper is 0.08 to 0.11 mm thick, so a 0.1 mm gauge will do fine). To be sure that the carriage hasn't been moved by the tramming, issue a homing command and move to the corner to the right and repeat the process to crete a slight drag of the paper when pulled between the nozzle and build surface. Note that tramming this point may have influenced the first point. Now repeat the homing and moving (for corners back right and back left) to start over again at the front left corner and repeating the whole process at least one to two times. This iterative process will deliver a trammed bed, the bed should now be parallel to the nozzle.
Trammed, but filament not adhering...
Once trammed the build surface should be parallel to the nozzle, if the distance (usually paper thickness) is too far or too close, adhesion or first layer deposition may fail or cause surface defects like
ripples
. If not adhering the initial gap between the nozzle and the build surface (paper thickness) might be too big, making this smaller may help squish the filament more so that it adheres better to the build surface. Alternatively use an adhesive in between the build surface and the first layer, nowadays there are multiple dedicated sprays and liquids available, but some house hold product like wood glue, glue sticks and
hair sprays
could be used.
Build surface cannot or is difficult to tram
When the build surface isn't perfectly flat, tramming is a challenge, or doesn't provide a 2D plane at a fixed distance of the nozzle. In such cases, scanning the build surface and adjusting during printing might help to get the filament to adhere properly; this process is called automatic bed leveling or ABL (see
Automatic Bed Leveling (ABL) with a sensor (BLTouch, inductive, capacitive), how does it work?
). An alternative is UBL (see
What is ABL or UBL? Is this the same?
).
Tramming frequently?
The frequency of tramming depends on the quality and (mis)use of the printer to maintain the 2D plane parallel to the nozzle. For good quality printers the tramming is performed very seldom.