Preventive maintenance screws up PINDA
I have an i3 MK3S which is a year old and has been printing great! I decided to do some preventive maintenance and went through the list on the Prusa site. I tightened every bolt and screw, including all those on the back of the hot end. Full cleaning and lubrication of rods. I opened up the Einsy-case and tightened all the screws. I found that the Y belt was a bit loose and tightened it up.
The problems started when I ran the Z Calibration. The second calibration point the nozzle didn't stop and went all the way against the print bed. The PINDA had not triggered. Strange, I thought. I lowered the PINDA by a tiny amount and reran the Z calibration. Now it goes past the second calibration point but does the same thing on the 9th and final calibration point. I checked the PINDA sensor and it read 0, even with the nozzle against the bed. But it seemed flaky and would go to 1 if I moved the PINDA at all. Also it only seems flaky when the hot end is at the top right (last calibration point).
I tested the PINDA by putting a screwdriver up against it and it seems fine. No flakiness observed. But this is with the hotend in the middle.
I am looking for suggestions on what I might have done. My first idea is that tightening all the bolts on the back of the hot end was not a good idea. This might have pinched the cable from the PINDA. Second idea is that there is a partial break in the PINDA cable, anywhere along its length. Third idea is that by opening up the Einsy-case I somehow messed up the PINDA connection. I will open it up again and check the connection.
Any ideas on what the problem might be?
I should mention that I lowered the PINDA to the same level as the nozzle and the printer passed the Z-calibration. But I still think there is a problem, I don't think the printer should be run with the PINDA this low.
A quick update on my printer, in case anyone else has a similar issue. It seems to be OK now, I believe the issue was a pinched wire in the PINDA at the back of the hotend. I checked the connection of the PINDA to the EINSY board, and it was fine. I took off the back of the hot end, I didn't notice any pinched wires but I reattached it less tightly.
The printer then passed Z calibration after I lowered the PINDA. Whereas before I was running with a Z adjust of -0.5 now it is -1.5. This seems a bit odd, but it seems to be working fine now.
glad I read the last post I was going to suggest it may be a short, same thing can happen with the LCD , fan wires, thermistor wires etc,, sometimes it requires a replacment. eventually some of those components wires will wear and need replacement, so far its mostly been fan and thermistor for me but I keep extra PINDA's around also.
Having to re-adjust Z is not odd at all after a good checkup and screw tightening its normal that it might be different.
Glad you got things going again