Linear bearing turned into one way bearing issue  

Re: Linear bearing turned into one way bearing issue

Hi jyri.

Did you lubricate the bearings when you built the printer??

People often build without lube.

However the bearing should not jam.in one direction.

Have you had a word with prusa support via Chat?

Joan

Re: Linear bearing turned into one way bearing issue

Hi Joan,

I have not contacted chat yet. I gues I'l do that when I have time and I'm next to printer again. I did add some thick oil in linear bearings before adding them on smooth rods. Rod feels oily slippery when in use.

/Jyri

Re: Linear bearing turned into one way bearing issue

Hi all,

New with printing and now solving my first serious issue...

after about 15h of printing my X- channel failed mid printing (3S kit). It had shifted about 10cm and printing was stopped after X- collision. First it seemed just a bug but when running calibration wizard again and again it failed constantly. First tought it must be PINDA height issue but adjusting it didn't solve problem. Then noticed that occasionally X- move did'n reach it end stopper and too short X- move was the result.

Now when disassembled extruder and bearings hang free on rod I noticed that two of the bearings move well but upper right one is more like one way bearing and grabs into rod when moving left. Kit was built about a week ago and seemed ok for a while. I have already ordered spares but... Is this just a broken bearing or have I messed up something on assembly?

BR,
Jyri

I am experiencing this exact same issue word for word, new kit, new to printing, reported a collision, bearings getting stuck:

It would be great for Prusa to take ownership of this and send new bearings.
Sounds like faulty bearings are being shipped out.
I have started a thread of my own and hoping for some help.
regards
Gavin

Re: Linear bearing turned into one way bearing issue

Hi all,

New with printing and now solving my first serious issue...

after about 15h of printing my X- channel failed mid printing (3S kit). It had shifted about 10cm and printing was stopped after X- collision. First it seemed just a bug but when running calibration wizard again and again it failed constantly. First tought it must be PINDA height issue but adjusting it didn't solve problem. Then noticed that occasionally X- move did'n reach it end stopper and too short X- move was the result.

Now when disassembled extruder and bearings hang free on rod I noticed that two of the bearings move well but upper right one is more like one way bearing and grabs into rod when moving left. Kit was built about a week ago and seemed ok for a while. I have already ordered spares but... Is this just a broken bearing or have I messed up something on assembly?

BR,
Jyri

I am experiencing this exact same issue word for word, new kit, new to printing, reported a collision, bearings getting stuck:

It would be great for Prusa to take ownership of this and send new bearings.
Sounds like faulty bearings are being shipped out.
I have started a thread of my own and hoping for some help.
After doing some research, apparently the right lubrication might alleviate this, but there is nothing mentioned in the manual about this.
regards
Gavin

Re: Linear bearing turned into one way bearing issue

Not going to comment about ownership but good to hear my simple question helped others all ready!

To be honest i didn't chat with them after all. I just ordered replacements and installed them in silence. Took an extra beer when finished. (I ran out of those gummy bears 😯 ) Now it has worked flawlessly for a whole weekend. So it was the bearing and nothing else.

Buying few parts is no big deal to me and building from the kit was excellent choice to getting to know your printer... still sticking in to that. But because of courier costs had to order some extra stuff for the same costs. Just a small dent in very good reputation of i3 printer for me.

/Jyri

RE: Linear bearing turned into one way bearing issue

Hi.

Just thought I would add my story.

After around 300 hours of trouble free printing on a new MK3 I suddenly started to get layer shifting on the x axis. I had noticed a lot of grease on one smooth rod even though I don't grease them, I oil them. The other smooth rods were all clean. I took it apart to move the bearings independently and it was clearly one bearing that was in a bad way. After talking to chat who had helped me to find the problem, they have sent me 10 new bearings and new 1 smooth rod (the seized bearing had put some impressively deep scratches in it) free of charge.  

I had previously  had a MK2S and I found both kits had good quality components. Maybe they could have gotten a bad batch from their supplier? I guess that can happen sometimes to any manufacturer. 

But the point is that once they knew what the problem was, Prusa did replace all the damaged parts without me even asking.