Pinda wire disconnected/unplugged?
Hi,
I was printing relatively a big object with ABS and I set the bed temperature at 110'c so that the plastic able to stick better onto the bed and reduce the chance of peeling off. I was trying to print another part and the bed originally heated up to 100'c and during the mesh bed leveling sequence, on second point the printer tells me that the pinda wire was disconnected/unplugged.
I used "calibrate z" and the printer able to sense left and middle but not on the right most points were the printer kind of skipped it for unknown reason. Pinda did emit that red led light to indicate that it is working and off if it sensed the probe point. I did the "calibrate z" again, same thing happening again and I tried to bring down z to 0mm, pinda's led turned off to indicate it sensed the bed probe point at point 9 rear right position.
I tried to do the "first layer calibration" but i was stuck at bed leveling sequence of "wire disconnected/unplugged". I haven't done the initial test/setup or calibrate xyz yet though.
My assumptions was that pinda's internal thing were slightly damaged or the bed itself. But from my observation both are working fine
Any suggestions?
Re: Pinda wire disconnected/unplugged?
If everything's fine and it still fails to trigger, could be your bed is tilted. If I understand correctly your left and middle points trigger so your right side is probably too low. In principle your bed could be bent, but since it's left/right it's more likely your belt is not sitting correctly. Can you confirm it is centered and the front&back pulleys are in a straight line? If you move the bed to both extremes, the belt should do no left-right movement on the pulleys.
Re: Pinda wire disconnected/unplugged?
The thing is, on the left probe points, the printer simply increase the z-height without ever trying to probe it by about 1-2mm I think while others probed normally.
Nevertheless, I will try what you suggested when I got back
Re: Pinda wire disconnected/unplugged?
A quick check for the problem: drive up Z to max until the carriages on both sides push against the top brackets. Then drive Z down manually (careful) until the nozzle almost touches the bed. Switch off motors (or printer), you should now be able to push X (Y at minimum) to both extremes without change in the nozzle-bed distance. Rinse and repeat at Y/2 and full Y.
I do this with a piece of cardboard between nozzle and bed to feel the resistance, if you have one you can of course also use a dial indicator.
Since you printed ABS before, it is indeed possible the previous print warped and parts of it impacted the probe. In that case check the clamp is not broken and for good measure reseat the probe once more as during assembly.
Especially at higher temps it is good practice to drive up Z to 50+ mm before starting the print. The probe drifts and if you keep it too close to the bed during warmup it might deliver unreliable values. Pinda2 is supposed to fix that but I don't own one.
Re: Pinda wire disconnected/unplugged?
the pinda wiring is part of the extruder wiring bundle, that runs from the back of your X carriage to the Rambo casing,
During normal printing this bundle flexes backward and forward this motion will cause the wiring to fatigue,
prusa changed the configuration of the cable strain relief between the Mk2 and the Mk2s derivitives.
it is likely that one of the wires in the Pinda bundle has broken
there are three wires, Vcc(5volts) signal and ground(0volts)
if you turn the printer on, and raise the extruder at least 10mm, you should see a red glow around the top of the Pinda housing glowing RED
as in the picture above,
if you move the X carriage from left to right, the LED Should stay lit, if the led goes out or flickers towards the right side, there is a fault in the cable bundle,
if the LED Does not go out or flicker, try moving a pair of pliers, knife or any other metal item, against the plastic cap on the bottom of the pinda, the light should go out... if it doesn't, then there is a fault i the wiring...
led is dark in the picture below...
also check the endstop test on the LCD, the Z endstop value should change when you touch the metal against the pinda, but not change when you move the X carriage from side to side.
if this is your problem, you can check the cable bundle, make sure that the Nylon filament is still attached to the back of the X carriage, and not broken...
unwrap the bundle and check the cable from the pinda, if it's damaged it may feel limp, at the point where the cable bundle leaves the backof the X carriage (other points are possible but less likely....if you can identify where the danage is, you can remove the outer insulation and repair the broken wire inside, this will be a temporary repair.
you should consider either replacing the pinda,probe and wiring, or at least moving the cables so that the flex point is in a different position.
I know these pictures are of a Mk3 prusa, but the issues are the same, regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Pinda wire disconnected/unplugged?
Gee, does that really happen? Haven't been a big fan of that sort of probe to start with, but what a nuisance. I've put a layer of shrink wrap around my wire harness in all spots where cable ties sit, it seemed paranoid at the time but probably was a good idea.
Re: Pinda wire disconnected/unplugged?
@nils
During printing, I never had any abs curling and eventually hit the pinda probe until the pinda holder broke. I am using the mk2s r1 extruder set.
@joan
The pinda probe does light up when outside the range of the probe point but off when close at the probe point. I will give update
Re: Pinda wire disconnected/unplugged?
I'vej identified the issues where it is actually the pinda probe's internal wiring fault. I did an extra bit of testing and when the pinda probe moved to the middle of the x axis, pinda probe got triggered automatically, lesser than 50% of that it behaves normally.
Seems like the pinda probe's internal wiring are somewhat sensitive or easily broken