Suddenly Started printing higher than usual

Phaedrux

Is it consistent every time you home now?

jtroutt19

Yes it is. If I start a new print I have to pause the print and zero the Z at the correct height then resume printing.

Phaedrux

What do you get when you measure the trigger height with this?

https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height

jtroutt19

@phaedrux

So I get .73 reported in the head position. The very first time I did it it reported back to me in the actual G-Code console. It doesnt do that this go round.

The first time I did this I followed that exact same procedure and that is where the .73 came from. But that exact value gets reported in the head position box for Z if I do it now. Just wanted to reiterate that.

Phaedrux

So the Z position box will show whatever the G31 z offset is set to when you do a G30 because that's the height you've told it is is when the probe triggers.

And if G30 S-1 still gives you the same value it should be correct.

Can you post your homing file?

jtroutt19

@phaedrux

I dont get why all of the sudden it started doing this if nothing got changed.

And today my bed is showing 84°c when its cool to the touch....

; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Sat Sep 29 2018 12:21:44 GMT-0700 (Pacific Daylight Time)
G91                     ; relative positioning
G1 Z2.5 F6000 S2        ; lift Z relative to current position
M98 Pdeployprobe.g      ; deploy mechanical Z probe
G1 S1 X-269 Y-261 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000          ; go back a few mm
G1 S1 X-269 Y-261 F360  ; move slowly to X and Y axis endstops once more (second pass)
G90                     ; absolute positioning
G1 X51 Y20 F6000        ; go to first bed probe point and home Z
G30                     ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91                    ; relative positioning
;G1 S2 Z2.5 F100        ; lift Z relative to current position
;G90                    ; absolute positioning


M98 Pretractprobe.g     ; retract mechanical Z probe

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool on Sat Sep 29 2018 12:21:44 GMT-0700 (Pacific Daylight Time)
G91              ; relative positioning
G1 Z2.5 F6000 S2 ; lift Z relative to current position
G90              ; absolute positioning
G1 X51 Y20 F6000 ; go to first probe point
G30              ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91             ; relative positioning
;G1 S2 Z2.5 F100 ; lift Z relative to current position
;G90             ; absolute positioning

Phaedrux

@jtroutt19 said in Suddenly Started printing higher than usual:

And today my bed is showing 84°c when its cool to the touch....

That's concerning. Is the wiring and thermistor intact?

M98 Pdeployprobe.g ; deploy mechanical Z probe
M98 Pretractprobe.g ; retract mechanical Z probe

You should probably remove this from homeall.

I can't see anything else in your homing files that's amiss.

jtroutt19

@phaedrux
I reloaded the firmware and the temp is showing correct again.

I dont understand how anything has changed. But I added .4 to my trigger height and it now is at the correct height.

Hey while I am here let me ask you. Dual 5015 blowers or just one?

Phaedrux

Was there possibly a head collision at some point? All it takes is a small shift. Since nothing software wise had changed, some mechanical explanation would seem likely. Wear, damage, binding, loosening parts, etc. Give everything a really good inspection.

@jtroutt19 said in Suddenly Started printing higher than usual:

Dual 5015 blowers or just one?

That depends how much cooling you need and what shroud you're using. I use a single 5015 with a Dii cooler shroud. Depends on the 5015 as well. How powerful are they?

jtroutt19

@phaedrux

Ahead of ya there. After getting home today I double checked everything. Made sure everything was still tight and square. I couldn't find any issues. But oh well its fixed now.

I am using the Petsfang 5015 mount for the hot end cooling with a noctua fan. The blowers other than being brushless and 24v I have not clue about. I ordered them off amazon and they sent me two. I am currently printing the duct to accommodate one of them. I just didnt know of 2 were ever going to be needed.

I dont know how much cooling I am going to need. Not sure how to even start answering that question.

Phaedrux

@jtroutt19 said in Suddenly Started printing higher than usual:

Not sure how to even start answering that question.

Start printing. You'll know. One will likely be enough. I'm going to guess that the blowers from amazon are probably a little loud and pretty powerful. And they probably sent two because there's a good chance one will be DOA. So at least you have a spare.