This is my first reprap machine. It is a HIC Prusa I3: [www.amazon.com] I am running Marlin Firmware. I have been troubleshooting issues with this thing for awhile getting it printable. I have gotten just about everything set, but I have two remaining issues. First, the X-axis motor doesn't seem to generate enough torque to turn the belt. This occurred after I adjusted the driver pot and changed the firmware speeds based on this thread [forums.reprap.org]. I adjusted it because the motor was skipping steps really bad. I have tried putting it back to where it was originally, but still no turning. I also tried going with a really low Vref and a really high Vref, but to no avail. One time after adjusting the Z-axis motor driver, I plugged in the X-axis motor into the Z driver by accident. The X-axis motor turned no problem, and the Z-axis driver was set to the exact same Vref (0.32V) and typical Z-axis feed rate and acceleration. The last settings I had were as follows: #define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,398.269957,94.4962144} #define DEFAULT_MAX_FEEDRATE {200, 200, 6, 25} #define DEFAULT_MAX_ACCELERATION {200,200,10,200} #define DEFAULT_ACCELERATION 150 #define DEFAULT_RETRACT_ACCELERATION 150 #define DEFAULT_XYJERK 10.0 #define DEFAULT_ZJERK 0.4 #define DEFAULT_EJERK 5.0 Is there any reason the X-axis motor would work on one driver but not the other when they have the same Vref? I calculated the Vref values based on this thread: [www.nextdayreprap.co.uk] I am running this motor on the X-axis: [www.dhgate.com] Second, I have pulsing and clicking issues on both the X- and Z- axis. I have tried a range of Vref and feed rate combinations, but the pulsing still happens. I have spent hours reading up on RepRap forums as well as others to find a resolution. Any help with either of these would be huge! I've been at this way too long, haha. https://reprap.org/forum/read.php?262,494550,494550#msg-494550 Mon, 12 Oct 2026 05:21:02 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?262,494550,496273#msg-496273 https://reprap.org/forum/read.php?262,494550,496273#msg-496273
The item which needs to be replaced is on thingiverse: [www.thingiverse.com]

I have exactly the same printer, bought it from aliexpress, and had to replace the X axis carriage and some more stuff to get it to work properly.
My X axis was also slipping, which was due to the bad quality of the aluminium pulleys. I replaced the socket set screws of the pulleys with longer ones to resolve that.

I have to say, for the price, and knowing up front that the X axis carriage would be warped, it's not a bad deal. Do expect to be tuning stuff for a while though, and sometimes replacing parts for a better quality / version.

Out of curiosity, did you get a complete set of STL files with your printer? they should be on the CD/DVD that came with it, but mine didn't have them :(

If you have any further questions about this machine, feel free to ask.]]> wwolkers Printing Mon, 13 Apr 2015 09:14:22 -0400 https://reprap.org/forum/read.php?262,494550,496147#msg-496147 https://reprap.org/forum/read.php?262,494550,496147#msg-496147
As for feedrate, I'd set x and y to 150mm/s for now an z to 3mm/s. Acceleration I'd start with 1000mm/s2 for x an y. Also make sure that you eather use the lcd and eeprom setting orbturn off eeprom as the firmware settings are ignored with eeprom turned on.]]> imqqmi Printing Mon, 13 Apr 2015 02:19:33 -0400 https://reprap.org/forum/read.php?262,494550,494586#msg-494586 https://reprap.org/forum/read.php?262,494550,494586#msg-494586
You need to check the wiring of your steppers, for loose connections or crossed coils. Switch drivers position Z to X and try it, your driver might be bad.]]> ggherbaz Printing Wed, 08 Apr 2015 21:41:25 -0400 https://reprap.org/forum/read.php?262,494550,494550#msg-494550 https://reprap.org/forum/read.php?262,494550,494550#msg-494550
[www.amazon.com]

I am running Marlin Firmware.

I have been troubleshooting issues with this thing for awhile getting it printable. I have gotten just about everything set, but I have two remaining issues.

First, the X-axis motor doesn't seem to generate enough torque to turn the belt. This occurred after I adjusted the driver pot and changed the firmware speeds based on this thread [forums.reprap.org]. I adjusted it because the motor was skipping steps really bad. I have tried putting it back to where it was originally, but still no turning. I also tried going with a really low Vref and a really high Vref, but to no avail. One time after adjusting the Z-axis motor driver, I plugged in the X-axis motor into the Z driver by accident. The X-axis motor turned no problem, and the Z-axis driver was set to the exact same Vref (0.32V) and typical Z-axis feed rate and acceleration. The last settings I had were as follows:

#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,398.269957,94.4962144}
#define DEFAULT_MAX_FEEDRATE {200, 200, 6, 25}
#define DEFAULT_MAX_ACCELERATION {200,200,10,200}

#define DEFAULT_ACCELERATION 150
#define DEFAULT_RETRACT_ACCELERATION 150

#define DEFAULT_XYJERK 10.0
#define DEFAULT_ZJERK 0.4
#define DEFAULT_EJERK 5.0

Is there any reason the X-axis motor would work on one driver but not the other when they have the same Vref?

I calculated the Vref values based on this thread: [www.nextdayreprap.co.uk]

I am running this motor on the X-axis: [www.dhgate.com]

Second, I have pulsing and clicking issues on both the X- and Z- axis. I have tried a range of Vref and feed rate combinations, but the pulsing still happens. I have spent hours reading up on RepRap forums as well as others to find a resolution.

Any help with either of these would be huge! I've been at this way too long, haha.]]> kwelliott89 Printing Wed, 08 Apr 2015 19:23:11 -0400