I have a delta printer set up witha capacitive z-probe and glass bed.
I've previously had the printer running without a z-probe but got tired of reconfiguring the endstop offsets after each print to account for variations when I removed and replaced the printbed for cleaning/part removal.
I followed the setup guide here [www.repetier.com] although I am a bit confused about the section which describes moving all the sliders to a set distance from the base of the printer; my printer is built from aluminium extrusion and the max endstops and fixed to the top of the frame, they are activated by printed parts on the sliders which are all identical and not adjustable so when the axes arfe homed having sent the m322 command, the sliders are all the same distance from the base of the printer? I've tried using a ruler as described to position the sliders but this just seems like a less accurate as it introduces my human error.
This is my calibration procedure:
I have removed the endstop offsets I used when I did not have a Z probe.
After sending m322 I home the axis
then I send G1 Z10 f4800 to bring the end effector close to the print bed, m,y printer has a Z height of 450mm so if I do not perform this step, the printer does not touch the bed at the first point, I think it only moves down a set distance before aborting the measurement.
Finally, I send G32, this probes the points near the extent of my print surface at X129.9 Y-75, X129.9 Y75 and X0 Y-150
Having done this I find that small objects, up to about 80mm in diameter print well and have good bed adhesion.
For larger objects, it becomes clear that the homing process was not accurate and the nozzle is either smooshed into the bed or in other areas of the bed over 1mm from the bed surface.
I know that when I originally calibrated the printer, I did not get the "horizontal radius "eeprom setting perfectly correct and there was a deviation of perhaps .25mm across the bed so that when I printed very large objects, about 300mm in diameter, there would be excessive adhesion in the center of the bed and inperfect adhesion at the edges.
So my question is, does the g32 command effect the "horizontal radius" setting and if not what steps should I take to impove the accuracy of the probe?
Another point which might be key is I am unsure how the x,y z-probe offset function works, if my probe is 20mm from the nozzle in the positive X direction, should the offset be x+20 or x-20 ? I have tried both settings but there does not sem to be a significant impact on my issue.
I've previously had the printer running without a z-probe but got tired of reconfiguring the endstop offsets after each print to account for variations when I removed and replaced the printbed for cleaning/part removal.
I followed the setup guide here [www.repetier.com] although I am a bit confused about the section which describes moving all the sliders to a set distance from the base of the printer; my printer is built from aluminium extrusion and the max endstops and fixed to the top of the frame, they are activated by printed parts on the sliders which are all identical and not adjustable so when the axes arfe homed having sent the m322 command, the sliders are all the same distance from the base of the printer? I've tried using a ruler as described to position the sliders but this just seems like a less accurate as it introduces my human error.
This is my calibration procedure:
I have removed the endstop offsets I used when I did not have a Z probe.
After sending m322 I home the axis
then I send G1 Z10 f4800 to bring the end effector close to the print bed, m,y printer has a Z height of 450mm so if I do not perform this step, the printer does not touch the bed at the first point, I think it only moves down a set distance before aborting the measurement.
Finally, I send G32, this probes the points near the extent of my print surface at X129.9 Y-75, X129.9 Y75 and X0 Y-150
Having done this I find that small objects, up to about 80mm in diameter print well and have good bed adhesion.
For larger objects, it becomes clear that the homing process was not accurate and the nozzle is either smooshed into the bed or in other areas of the bed over 1mm from the bed surface.
I know that when I originally calibrated the printer, I did not get the "horizontal radius "eeprom setting perfectly correct and there was a deviation of perhaps .25mm across the bed so that when I printed very large objects, about 300mm in diameter, there would be excessive adhesion in the center of the bed and inperfect adhesion at the edges.
So my question is, does the g32 command effect the "horizontal radius" setting and if not what steps should I take to impove the accuracy of the probe?
Another point which might be key is I am unsure how the x,y z-probe offset function works, if my probe is 20mm from the nozzle in the positive X direction, should the offset be x+20 or x-20 ? I have tried both settings but there does not sem to be a significant impact on my issue.