Whenever i start printing for the first few layers it prints properly, but then after t gets about a little ways up(30 min) the extruder starts to dig into the plastic. I believe it is still extruding, but it starts to embed itself. I think it could be that the extruder is to hot (200) degrees. Could anyone tell me what I am doing wrong? https://reprap.org/forum/read.php?4,276289,276289#msg-276289 Fri, 10 Jul 2026 06:52:22 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,276289,278359#msg-278359 https://reprap.org/forum/read.php?4,276289,278359#msg-278359 uncle_bob Reprappers Tue, 10 Dec 2013 18:10:00 -0500 https://reprap.org/forum/read.php?4,276289,278347#msg-278347 https://reprap.org/forum/read.php?4,276289,278347#msg-278347 printer_man58 Reprappers Tue, 10 Dec 2013 17:43:09 -0500 https://reprap.org/forum/read.php?4,276289,277908#msg-277908 https://reprap.org/forum/read.php?4,276289,277908#msg-277908
You do realize you're supposed to measure filament going in to the extruder, not coming out of it, right?]]> sheck626 Reprappers Mon, 09 Dec 2013 23:24:40 -0500 https://reprap.org/forum/read.php?4,276289,277877#msg-277877 https://reprap.org/forum/read.php?4,276289,277877#msg-277877
---------------

The not so easy way:

1) Leave the hot end on the machine
2) Heat it up
3) Make absolutely sure the filament is not extruding so fast the hobbed bolt is slipping
4)Mark a point on the filament 120 mm above the top of the extruder
5) Tell the extruder to do 50 mm of extrusion at 5 mm / min (come back in 10 minutes)
6) Measure the distance to the mark above the extruder
7) Take the difference between the two measurements

Ideally you would get a difference of 50 mm (first measure 120, second measure 70). You probably will get something else. Adjust the steps/mm settings in your configuration.h for the E motor.]]> uncle_bob Reprappers Mon, 09 Dec 2013 21:22:50 -0500 https://reprap.org/forum/read.php?4,276289,277863#msg-277863 https://reprap.org/forum/read.php?4,276289,277863#msg-277863 printer_man58 Reprappers Mon, 09 Dec 2013 19:29:17 -0500 https://reprap.org/forum/read.php?4,276289,277846#msg-277846 https://reprap.org/forum/read.php?4,276289,277846#msg-277846
First thing to check is the current ratings on your motors. Those should be available from the people who sold you the motors.

Second thing is to grab a DVM and check the Vref voltages on all your stepper controllers.

For X and Y, a good starting point is to give the motors 1/2 the current they are rated for. On the Z axis, start at about the current they are rated for (each motor gets 1/2 the current).

If that works out to more than about 1.2A, you will need to compromise on a setting. The normal drivers aren't very happy much over an amp.]]> uncle_bob Reprappers Mon, 09 Dec 2013 18:12:29 -0500 https://reprap.org/forum/read.php?4,276289,277497#msg-277497 https://reprap.org/forum/read.php?4,276289,277497#msg-277497 To calibrate the Extruder
1. Take the Extruder out of the Nozzle
2. Feed the ABS or PLA
3. Extrude 50 mm or 100 mm
4. Measure the Length Extruded
5. Note down the Expected length and extruded length readings
6. Change the Extruder Steps per MM in config.h in firmware by calculating Expected steps per MM in E

Here we go
x is the desired steps per mm need to be calculated (unknown)
y is the present steps per mm in config.h firmware

x = y * Expected length / Extruded Length

7. Update it in firmware and upload the new modified firmware
8. Do the above steps more than 1 time with lengthy extrusions
9. Update the repeated or average values in Extruder steps per mm

(There are some options with out changing the firmware it can be done by applying gcode directly to printer by changing EEPROM settings but I find difficult sometimes, so I don't use it)

if your firmware is Marlin you can find the steps per mm of E in the following line in configuration.h (around line no 360)
#define DEFAULT_AXIS_STEPS_PER_UNIT {126,127,5120,1800} // default steps

here
126 is X axis steps per mm
127 is Y axis steps per mm
5120 is Z axis steps per mm
1800 is E axis steps per mm

Change the last one reduce by half and try it hope it will work

"After a bit of screwing around I found that my z-axis was missing steps so when the z axis should have been 30mm, say, it was physically at 25mm or so. I fixed this by lowering the speed of my z-axis in the config file - cant remember how but it worked. I also got some dinkey alu heat sinks off ebay and stuck them on my drivers so alleviate overheating"
It is because your Z motors are built for lesser speed, when the speed goes up, motor's torque goes down so there will be struck between the rotation, good for slow printing]]> GowthamJGR Reprappers Mon, 09 Dec 2013 03:32:12 -0500 https://reprap.org/forum/read.php?4,276289,277480#msg-277480 https://reprap.org/forum/read.php?4,276289,277480#msg-277480
After a bit of screwing around I found that my z-axis was missing steps so when the z axis should have been 30mm, say, it was physically at 25mm or so. I fixed this by lowering the speed of my z-axis in the config file - cant remember how but it worked. I also got some dinkey alu heat sinks off ebay and stuck them on my drivers so alleviate overheating.

It did not entirely fix the issue though. I had meticulously measured and checked the extruder feedrate and ended up with a number of 7-hundred and something in my config file. Nevertheless, too much material seemed to come out of hot end causing it to dig into my print. I found that changing my feed rate using 'M92 e300' in pronterface when about to start printing sorted it. I play around with the 300 number if I think things are going wry during the print.

Its not perfect but I get useful object at the end of it.

I would love to know why my extruder rate is so out (50% or so) but if you still have a problem this might be a temp fix until someone-who-knows can fill me (us!) in about extruder rate eh?]]> aegis1980 Reprappers Mon, 09 Dec 2013 01:31:17 -0500 https://reprap.org/forum/read.php?4,276289,276761#msg-276761 https://reprap.org/forum/read.php?4,276289,276761#msg-276761 uncle_bob Reprappers Fri, 06 Dec 2013 22:37:44 -0500 https://reprap.org/forum/read.php?4,276289,276740#msg-276740 https://reprap.org/forum/read.php?4,276289,276740#msg-276740 calibration guide. It has just about everything you need to get your machine calibrated.]]> sheck626 Reprappers Fri, 06 Dec 2013 19:13:59 -0500 https://reprap.org/forum/read.php?4,276289,276727#msg-276727 https://reprap.org/forum/read.php?4,276289,276727#msg-276727 printer_man58 Reprappers Fri, 06 Dec 2013 18:03:46 -0500 https://reprap.org/forum/read.php?4,276289,276681#msg-276681 https://reprap.org/forum/read.php?4,276289,276681#msg-276681 GowthamJGR Reprappers Fri, 06 Dec 2013 14:43:50 -0500 https://reprap.org/forum/read.php?4,276289,276358#msg-276358 https://reprap.org/forum/read.php?4,276289,276358#msg-276358
1) The flow rate multiplier(s) in your slicing program
2) The steps / mm in your firmware for the extruder
3) The *real* diameter of your filament (it's rarely 3.0, more likely 2.84 or 2.96 or 3.06)
4) The dryness of your filament

There are many other contributors, but those are the most likely ones.]]> uncle_bob Reprappers Thu, 05 Dec 2013 18:59:10 -0500 https://reprap.org/forum/read.php?4,276289,276304#msg-276304 https://reprap.org/forum/read.php?4,276289,276304#msg-276304 printer_man58 Reprappers Thu, 05 Dec 2013 16:14:38 -0500 https://reprap.org/forum/read.php?4,276289,276295#msg-276295 https://reprap.org/forum/read.php?4,276289,276295#msg-276295
However, its more likely your Z calibration is incorrect. Have you measured that if you tell the Z to go up 100mm it actually goes up by 100mm

Also check for loose grub screws etc in your Z drivetrain]]> rogerclark Reprappers Thu, 05 Dec 2013 15:43:31 -0500 https://reprap.org/forum/read.php?4,276289,276289#msg-276289 https://reprap.org/forum/read.php?4,276289,276289#msg-276289 printer_man58 Reprappers Thu, 05 Dec 2013 15:31:15 -0500