X axis length fail
Hi just completed my mk3 but it fails on the self test on x axis I can’t see anything in the way stopping it . I have updated to the lastest firmware. I would appreciate any help as I am a bit disappointed . Thanks from Wes
Re: X axis length fail
Make sure your zip ties and cables on the extruder are all oriented exactly like in the manual. A zip tie head or cable in the wrong place can make all the difference.
Re: X axis length fail
Hi thanks for replying I had removed all zip ties still the same problem . But I have fixed it by losening the x axis I must had them too tight around the bearings . Now works a treat and all axis are perpendicular
Re: X axis length fail
How do you loosen the 'x axis' ? I am having the same issue of x axis length failing is an example of what happens.
Re: X axis length fail
the Prusa Mk3 uses 'Magic' to simulate End Stops, on the Mk3... 😯
what happens is that the Trinamic Motor driver senses the electrical signals caused by driving the motor and tries to identify when it touches the extremities of motion for the X and Y axis...
it may be that your printer is seeing a false resistance to travel and reporting this error as 'X axis length fail'
check that your X axis assemble moves freely and smoothly from side to side.
Resistance can be caused by a number of things. such as :
X axis Cable bundle resisting motion, or clashing with the main frame
X axis Motor Toothed wheel, back to front, the clamping hub should be towards the front. not towards the motor.
X axis Idler bolt too tight, this causes the sides of the idler to rub against the plastic mounting.
X carriage clamping bearings badly,
X axis Belt too tight, try loosening adjuster if you have one loosen the motor screws to allow the motor to re position, then tighten the motor screws again
X axis Bearing gritty or needing lubrication, clean and re lubricate
the issue could be caused by one or more of these possibilities
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: X axis length fail
Solved my problem by removing a screw from the left hand fan. Was touching z-axis rail
RE: X axis length fail
because it looks are the distance between the 2 end stops you could also have something sticking out a bit on the right side that shortens the overall X axis travel
RE: X axis length fail
Solved my problem by removing a screw from the left hand fan. Was touching z-axis rail
I recently had a puzzling x-axis length failure. I had not recently changed anything on the machine. All the zip ties and cables were correct. Machine had passed x-axis many times previously.
Problem turned out to be a bolt head on the right side vertical. My power supply is external to enclosure. Instead a reinforcing bracket sits in the power supplies place. M4 bolts hold the reinforcer to the upright. The M4 socket bolt head was just long enough to block the x-carriage, BUT ONLY IF THE X CARRIAGE WAS AT EXACTLY THE RIGHT HEIGHT to hit the bolt head. I had finally asked the printer to do a check when z was at just the right height to create an impact.
Thankfully, a box of cap head screws was at hand.
RE: X axis length fail
I had the X axis length fail problem with my new MK3S. I found that by checking the menu Support / Belt Status there is a numerical value assigned to the X & Y Belt tensions, after every Self Test is performed. According to Prusa knowledgebase, it is best for both X & Y Belt tensions to be between 240-300. When my X belt tension read 207, I got failed X length almost every time. As soon as I loosened the belt so that is was in the range, 246 for me, the error has completely disappeared. now 20 successful prints since this.
Here is link to Prusa article I followed.
https://help.prusa3d.com/article/t0n82ib3af-crash-detection
RE: X axis length fail
This thread comes up v early in my Google results when looking for a solution to my "x axis self-test fail".
I wanted to pass along my observations. After trying some new nozzles for my printer, I discovered that my heater cartridge was wearing between the element and the wires passing into it right along the heat block. After replacing the block, thermoresistor, and heater cartridge I had significant difficulty passing the x axis self-test.
As best as I can tell, the issue was the zip ties on the umbilical cord not being tight enough on the main bundle. It is possible that the heads of the two lower zips were incorrectly positioned.
Good luck to all who find themselves here...