Command the print head to the XY coordinates you want to probe.This is to ensure that you can lower the nozzle all the way to the bed in step 5. Send M208 S1 Z-3 to temporarily allow Z moves down to Z=-3mm.Cancel any existing bed compensation by sending M561.Make sure there is no filament stuck to the nozzle (you may want to do this test with the nozzle hot).Measure the trigger height of your Z probe at various XY positions and make sure it is consistent. The Z probe trigger height must not vary significantly with XY position. Like any Z probe that is offset from the nozzle, if you have effector tilt that varies with the XY position of the effector, this will give rise to a corresponding variation in trigger height. borosilicate glass plates with Kapton heaters glued directly to them. Not suitable for transparent beds with variable or highly-reflective surfaces below them, e.g. It is small enough to mount close to the nozzle, below the heatsink of the popular E3Dv6 hot end. A small piece of electronics is generally used to measure the resistance of the FSRs and provide a trigger signal to the Duet or other electronics. The design of the bed supports is critical, because the bed must be constrained not to move sideways yet the weight must be taken by the FSRs and the FSRs must be protected from the heat of the bed heater. The nozzle itself is used to push the bed and the FSRs detect the force. Three force sensitive resistors (FSRs) mounted in the bed supports.This has a built-in strain gauge to detect contact between the nozzle and the bed. The most popular types of Z probe for delta printers are: It must not add appreciable weight to the effector.If it does not use the nozzle itself as the probe, it must be small enough to be mounted close to the nozzle, to minimize the effect that effector tilt has on trigger height.It must work well with your print bed surface, to give a consistent trigger height over the whole of the bed.The choice of a suitable Z probe should take account of the following factors: However, auto calibration is easier and faster if you have a Z probe. Your can run auto calibration without a Z probe if you tell RepRapFirmware that you have no Z probe, by using parameter P0 in your M558 command in config.g. Troubleshooting with heightmap visualization.Correcting for small X and Y scaling errors.Using mesh bed compensation to handle residual height errors.Running auto calibration for the first time.Adding trigger height corrections to the bed.g file.

Choosing a Z probe for auto-calibration.

Setting up your initial delta parameters.

Carriages must not be rotated or warped about the Z axis.

The two bearings on each carriage must be at the same height.The joints must have enough angle of movement to allow the nozzle to reach all of the printable area.The spacing between the bearings at the top of a pair of rods must be exactly the same as the spacing between the bearings at the bottom.All 6 rods must be the same length, measured between bearing centres.Bed should be at right angles to the towers in both X and Y directions.

Bed visualizer 3d printer