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Layer Height Explained: Time, Surface and Strength
Layer height accuracy is quoted as 0.04 mm at its finest and 0.6 mm at its coarsest, and either figure is the thickness of one layer. Thickness is the unit a 3d printer counts a part in, and one setting reaches three specifications at once.
A large format 3d printer builds by stacking, and the stack is read from outside it. Each outcome is a count that follows from the height of the job and the thickness of a layer.
Three quantities settle the matter. How many layers the part holds. How far the outer face steps sideways between two of them. How much bonded area holds one layer to the next. Layer height explained as a setting is those three counts.
Why Layer Height Is a Count Before It Is a Setting
Division gives the count first. A part standing one metre on the plate is 1,000 mm tall, so the number of layers is that height divided by the thickness: 5,000 at 0.2 mm each, and 1,667 at 0.6 mm.
What makes that division worth doing is the width of the band. Divide the coarse end by the fine end: 0.6 / 0.04 = 15, and the count at the fine end is fifteen times the count at the coarse end.
The volume of polymer does not change. A footprint of one square metre carried to a height of one metre holds a cubic metre whether the stack has 5,000 layers or 1,667, because volume is footprint times height.
Layer height and layer count are one statement written two ways. Filament and pellets make no difference to the division, since the stack is the same stack whichever feed supplies it.
Print Time Follows the Count of Layers, Not the Volume
Layer height and print time are joined through repetition rather than through volume. Each layer carries the same two events: the head walks the outline of the section once, and the stack rises by one thickness.
The outline is where the arithmetic grows large. A footprint one metre on a side has an outline 4,000 mm long, and that outline is traced once per layer.
At 0.2 mm it is traced 5,000 times, which is 20,000 metres of travel. At 0.6 mm it is traced 1,667 times, which is 6,668 metres.
Those two jobs differ in overhead rather than feedstock. The outline at the fine end is three times as long and carries the same volume spread thinner.
Layer Height and Stair Stepping: Why a Slope Steps and a Wall Does Not
Layer height and stair stepping describe one geometric fact. A layer is a slab with a flat top, so a face that leans is set back from the slab beneath it by the distance it leans over one thickness.
The ledge has a size, and the size is a tangent. On a face leaning 45 degrees from vertical the horizontal advance per layer equals the layer height, because the tangent of 45 degrees is 1: a 0.2 mm layer leaves a 0.2 mm ledge.
A face at 90 degrees to the plate is the other case, and there the advance is 0, because the slabs stack flush. Layer height surface finish is the spacing between ledges, which the thickness sets, while the lean sets their depth.
Layer height surface roughness is that pair of numbers read with an instrument instead of an eye. Ridges on a slope are the top edges of the slabs, spaced by the thickness and cut back by the angle.
Layer Height and Layer Bonding: Where the Joins Are Counted
Each boundary in the stack is a plane where one layer's polymer was laid onto the layer beneath it, so a 1,000 mm stack holds as many planes as it holds layers.
The planes add up over a whole part. A footprint of one square metre sliced into 5,000 layers holds 5,000 planes that size, which is 5,000 square metres of interface inside a cubic metre of part.
A plane answers for a slab, and the slab is the layer height. Layer height and layer bonding are arithmetic about how much polymer belongs to each join: at 0.6 mm layers a plane answers for 0.6 mm, and at 0.04 mm layers for 0.04 mm.
Layer height and part strength meet at that count. A finer slice multiplies the planes and leaves less polymer at each one; a coarser slice does the reverse. Which way a part is loaded is a separate question, and the thickness of a layer does not answer it.
What 0.04 mm and 0.6 mm Do to the Same Part
The count over one metre of height makes the spread visible, and the fine end reaches 25,000 layers where the coarse end reaches 1,667.
That is the reach of a figure carried as one line of accuracy data on a 3d printer: a fifteenfold change in the count, and with it in the ledges on each slope and the interfaces inside the part.
What limits the fine end is a different figure on the same page. Location accuracy is quoted at 0.02 mm, so the finest layer of the band is twice the increment the axes resolve. Past that point the motion system rather than the stack becomes the constraint.
Why the Three Quantities Move in Different Directions
One dial does not serve the three outcomes, because two of them are counts and the third is a length.
Finer layers raise the counts and lengthen the schedule. Coarser layers shorten the schedule and deepen each ledge on a leaning face. A part judged on its surface and a part judged on its schedule pull toward opposite ends of the same band.
The interface count travels with the schedule instead: a finer slice raises the number of planes and leaves less polymer at each one at the same moment.
What the count does not do is name the plane that matters, because that follows from the load the part meets and the shape around each plane.
Where the Step Height Names the Setting
Step height is the one quantity a finished part gives back without being cut. On a face leaning 45 degrees, the width of a single ledge is the layer height behind it, because the tangent is 1 at that angle.
Two readings follow from the same place. A ledge wider than the angle predicts points at a steeper face, since the ledge is the thickness multiplied by the tangent. Ledges closer together than the thickness accounts for point at a finer slice than the file records.
The reading matters because a file and a part can disagree: a job sliced at one thickness leaves ledges at the thickness used. A high precision 3d printer answers for the face it delivers, and the ledge is the visible part of that decision.
Where a Tall Part Meets Each of the Three
Layer height on large parts is answered by the same arithmetic run over more layers. Both the count of layers and the count of interfaces grow with the height of the job, while the thickness stays one figure in the file, so a taller job multiplies both counts at once.
Ledge depth does not follow the part upwards. It answers to the thickness and the lean alone, so two faces at the same angle carry ledges of the same depth whether the part is short or a metre tall.
An industrial 3d printer holding a schedule on a tall part meets the count as its limit, because the counts are the only quantity of the three that grows with height. Choosing between the ends of the band is a decision about which quantity the part is judged on.
