Calibration Square - Three Layers

prusaprinters

This is designed to print THREE layers - bottom, infill, and top.Often times you can have what appears to be a perfectly calibrated first layer, only to discover the 2nd layer has issues sticking to the first (like forming gills). This is usually due to over-squishing layer 1, thereby causing too large of a gap between layers 2 and 1. The resulting gap between these layers causes layer 2 to act oddly. Sometimes subsequent layers recover, sometimes they don't. By building in layers 2 and 3 into a calibration, we can fix the issue before moving on to a "real" print.1. Get layer 1 to stick by moving the nozzle closer.2. Observe layer 2. If it peels away or forms a sort of gill, your nozzle is too close and a vertical gap results between layer 1 and where the printer starts layer 2.3. Observe layer 3. If you had to accept minimal peeling/gills to keep layer 1 sticking, ensure layer 3 at least squishes them back down.Relevant SettingsNote: Currently set to calibrate a .25 nozzle. To adjust, set to 3x the layer height you are after, then adjust the settings below.--------------------------------------Fill Density: 100%Layer Height: 0.2mmFirst Layer Height: 0.2mmPerimeters: 1Solid Layers: 1Minimum Shell Thickness: 0.2mm Photo:In the photo you can see where I started with a printer that was set with a nozzle offset that was too low. It is progressively adjusted to reduce the “gills" effect on prints from left to right.