scott.h4
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What the heck am I doing wrong with my z calibration?

Sat Jun 17, 2017 9:03 pm

I am trying desperately to calibrate my live z. I downloaded Jeff's gcode, but I can't get it right. I keep getting rips in the cube. As you can see I the picture. This was set at -.515. I have tried -450 all the way to -640. The second picture is what happened with -640. What am I doing wrong?
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scott.h4
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Re: What the heck am I doing wrong with my z calibration?

Sat Jun 17, 2017 9:19 pm

By way of example, here is how -400 turned out. WTF?
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cory.w
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 2:51 am

What temp are you using? If its the silver PLA from Prusa, around 205 works well for me. Its a very forgiving filament.

Steps to calibrate and check:
Are you using bed temp calibration? - I prefer not but I have my start GCode for every print make sure PINDA is away from bed while it heats up, and then calibrates.
Make sure bed is cooled before starting new print/calibration
Start on the lower end and slowly adjust Z until it looks smooth. Once its done printing, check for holes between infill and perimeter, if so, increase infill by about 20 until they disappear and you have a nice smooth finish.
Make sure the extruder hobby is tightened and the securing bolt is on the flat side of the motor driver.
Calibrate your extruder first (Search Forum)

scott.h4
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 3:42 pm

I am using Prusa PLA. The temp is 215c. I have having an awful time trying to calibrate my E-steps. No matter what I do I can't get the extruder to keep calibration. I have read many posts on the topic and followed the instructions and inputs on pronterface, but nothing works. I keep underextruding. This is really frustrating. My pulley is nice and tight. I don't know what is going wrong. Any ideas?

How do you increase the infil?

hendrik.s2
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 3:46 pm

Maybe your Extruder Idler Springs have too much tension.

Can you unload the filament and post a photo how the part looks like where the pulley grabbed it?

scott.h4
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 4:09 pm

I will do that this afternoon and post.

Here is the latest print. You can see the under extrusion issues.
Image

cory.w
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 6:43 pm

What interface and steps are you doing to do extrusion calibration? Make sure you send commands one at a time.

Should be something like this once you determined your new value...
M92 E(new value)
M500
M501
M503
G92 E0 ----This is important to do after saving and before trying to extrude again. This resets where the printer this the extruder is/how much its used.

scott.h4
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 6:56 pm

I am doing everything in ponterface. The only code I am missing in my calibration sequence is the M501 after the M500 otherwise I am doing everything else in the list. Here are some images of my setup and the filimint after I unloaded it. Are my screws too tight?
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cory.w
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Re: What the heck am I doing wrong with my z calibration?

Sun Jun 18, 2017 9:01 pm

Hmmm

scott.h4
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Re: What the heck am I doing wrong with my z calibration?

Mon Jun 19, 2017 12:53 am

Every time I try to calibrate the extruder following the exact steps in the post above the newly calculated E-step always under extrudes under 100mm. Something hardware must be going on. I calculated 23mm off from 100mm. That is way too big. When I then entered the calibration of a new e-step of 209.48, when I extruded 100mm it was still under extruding by at least 4mm. I am now taking down the entire extruder. I am going to take the extruder apart and see if there is a blockage or something. This is crazy.

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