calibartion issue, only the right z-axis motor is spinning, when calibrating  

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

it is possible that i destoryed little bit the wire

so that ony big voltage/current can path.

here is a pic.
so how to change the wire. or do i need a new motor. or can i solder a new one to the motor?

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

i fixed the wires.
but there is still that issue.

so i dont know. what can i do. everything looks good 🙁

any ideas?

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

so how to change the wire. or do i need a new motor. or can i solder a new one to the motor?

the answer depends on how experienced you are in soldering tiny little things. your asking let's assume that you are not grown up with a soldering iron in your cradle 😆 .

💡
anyhow, the proper procedure would be to cut the blue wire at the damaged position and strip its insulation a few (2 - 3) mm at both ends. then you pull some convenient shrinkable tubing of appox. 2cm over the longer end (you'll need it later to cover the repaired location). afterwards you first coat both uninsulated ends with tin-solder and a fine soldering iron. after both ends are coated, use some tweezers, your soldering iron and steady hands to solder both ends together. make sure that the soldering joint is shiny and not dim. then pull the shrinkable tubing over the solder joint and shrink it, using a heat gun or similar. ready 😀

for the procedure you need a small soldering iron with a clean, shiny tip. not a 80W roasting tin, whose hot tip came in contact with plastics or wood once before...
if the damaged location is to tight to the motor block itself, you need to disassemble the motor block. but i won't recommend this if you are unexperienced.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

oops... took to long to explain, you've been quicker 😉 .

❓ did you check the connector that plugs into the rambo board ?

there the wires are sometimes not properly crimped. check the motors resistance with an ohmmeter at the connector. you should get a constant value of a few ohms.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

Okay. I Will do that tomorrow. Now i am having some beers in a pub 🙂

can you explain how to measure the ohm. I mean can you give me an exapmle what is the a right value and what is a wrong value.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

at my y-motor i measured approximately 6.5 Ohm at the connector for each phase (including the cables resistance).
there are two phases, so you should find 2x two of the 4 pins where you can measure a low resistance (~ 5 - 10 Ohm), but actually i can't tell you between which colors, so you have to try it out. in case of the z-motors the value might be a little bit higher, because they are slightly smaller and have a lower torque.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

it is important that the motor are running/spinning? do they have to move?

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

hey i only mesuered 4,2 ohm between red and blue. when the motor doenst move

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

here is a video of that issue.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

4.2 ohm is pretty ok for the phase.
didn't you measure the same resistance between green and black ?

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

okay , with proterface i can move both z axis 0.02mm (move z 0.02) that is working.
so maybee the firmware hase an issue?

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

it has the same value 4.2

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

hey the issue is still there. and i dont know what i can do.
i need your help.

i only got one answer from the technicians on tuesday.
Hello,
I just checked the video and Im nto sure what is wrong with it. The calibration is failing to finish?
Best regards

so i uploaded a new video. and wrote back an email.

here is a new video.

what i have do for troubleshooting:
-i inspectet all cable
-i switch the connector form the z-axis. but it is still the right motor, who is moving
-i solder the squised cables form the left z axis motor.

the print is now pretty sad 🙁
and gets coverd in dust 🙁

lets make that printer happy again 🙂
please help me.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

Maybe its a longshot but how strong have you screwed the scews on the right Z axis that press against the X-Axis?

Maybe try to carefully remove the X-axis and the threaded trapezoid nuts and inspect them, if the left one has got any damage.
Also then check if the threaded rods have some debris in them.

Also try to use high power mode to calibrate.

Also your printer in the second video is in an unfavorable position as the Bed hit your sofa and the whole printer moved 😀

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

hey,
yes, i noticed that the printer was in the wrong position. 😀

so unscrewed left z axis but it wasn t still moving.
i also checked if there is some debris inside. but it was clean.
and i the printer is in the high power mode.
🙁

maybe some other ideas?

i dont know why is the right z axis is moving up when he trys to fine calibrate? is this maybe the issue?
i mean normaly the z axis has to go down in tiny stepts. but this on is moving up in tiny steps

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

It can't hurt to try to reflash firmware for your Prusa.

http://www.prusa3d.com/drivers/

- Download 3.0.9 firmware
-Extract prusa3d_fw_3_0_9.zip
-Extract firmware_updater_v2.zip
-Connect printer to PC/MAC/whatever
-start FirmwareUpdaterV2.exe
-Select right .hex file -> see here which one it is http://www.prusa3d.com/downloads/firmware/EN-how-to-choose-firmware.pdf
-then Flash

here is a quick rundown of how to flash directly by Prusa:
http://manual.prusa3d.com/Guide/Upgrading+firmware/66

or simply hard reset your i3
http://help.prusa3d.com/mk2-firmware/factory-reset

Also dont be afraid when you move the axis up, to let them slam against the top end. do it for 5 seconds to be absolutely sure they are in their highest position. Joseph Prusa does it too in the first spin video, so i'm pretty sure it will not damage anything.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

yes, it will not damage anything.

i tried even older firmwares and the newst one. but there is still that issue. so maybe the motor is broken.
but i dont find any broken parts. except the sqeezed cable. but i soldered it.

the technicians will send me a new motor. so we will see.

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

Swap over the two motors, if the problem changes sides you know it's the motor. If problem stays the same you know it's the controller

Re: calibartion issue, only the right z-axis motor is spinning, when calibrating

you don't need to swap over the steppers itself, it's sufficient to swap the connectors at the rambo board