Re: Fine tune your MK3 Z axis
I mounted the Z motor mounts and it works very well. Previously, the motor was clearly of centered from the center hole and now it is perfect. It is also really handy to easily mount/remove the motors. I have attached the X axis on top of the frame with a string and then you can work on the motors without wobbly maneuvers.
Where are the new mk3 z tops you said you were working on? Am I missing something?
On my thingiverse account, here : https://www.thingiverse.com/thing:2552246
Re: Fine tune your MK3 Z axis
I mounted the Z motor mounts and it works very well. Previously, the motor was clearly of centered from the center hole and now it is perfect. It is also really handy to easily mount/remove the motors. I have attached the X axis on top of the frame with a string and then you can work on the motors without wobbly maneuvers.
Where are the new mk3 z tops you said you were working on? Am I missing something?
On my thingiverse account, here : https://www.thingiverse.com/thing:2552246
Perhaps the description indicating compatability is only up to MK2.5. Are they fine for MK3. Maybe update the text or make it clear if there is a separate file.
Re: Fine tune your MK3 Z axis
For now I do not have much time for the X axis. It is the most complex part and to do good job I have to go deep and this will takes several days/weeks. I would like to first release my Prusa i3 Bear Upgrade version 2.0 : https://github.com/gregsaun/prusa_i3_bear_upgrade/tree/dev
X axis is definitely pretty complicated.
As far as the Bear upgrade... That might be the ticket for my current Mk2. I've been wanting the removable bed, but I refuse to do anything to this printer as long as it still has the threaded rods. And $500 is a bit much for a full MK3 upgrade, so this might make more sense. So best of luck with that one!
Re: Fine tune your MK3 Z axis
I mounted the Z motor mounts and it works very well. Previously, the motor was clearly of centered from the center hole and now it is perfect. It is also really handy to easily mount/remove the motors. I have attached the X axis on top of the frame with a string and then you can work on the motors without wobbly maneuvers.
Where are the new mk3 z tops you said you were working on? Am I missing something?
On my thingiverse account, here : https://www.thingiverse.com/thing:2552246
Perhaps the description indicating compatability is only up to MK2.5. Are they fine for MK3. Maybe update the text or make it clear if there is a separate file.
You are right, done 🙂
For now I do not have much time for the X axis. It is the most complex part and to do good job I have to go deep and this will takes several days/weeks. I would like to first release my Prusa i3 Bear Upgrade version 2.0 : https://github.com/gregsaun/prusa_i3_bear_upgrade/tree/dev
X axis is definitely pretty complicated.
As far as the Bear upgrade... That might be the ticket for my current Mk2. I've been wanting the removable bed, but I refuse to do anything to this printer as long as it still has the threaded rods. And $500 is a bit much for a full MK3 upgrade, so this might make more sense. So best of luck with that one!
The threaded rods is not the only one responsible of the flex in this printer (but clearly the biggest one). I was quite surprised when I mounted my half upgrade for the first time, thas was way more strong. However the alu frame has also a bit of flex and it is visible in the prints. This is why I propose two types of upgrade with the V2.0, depending the needs of the users.
Re: Fine tune your MK3 Z axis
Please clarify :
What is version 1.0 and what is 2.0
On the github I only find full and half mod.
Thomas
Re: Fine tune your MK3 Z axis
I mounted the Z motor mounts and it works very well. Previously, the motor was clearly of centered from the center hole and now it is perfect. It is also really handy to easily mount/remove the motors. I have attached the X axis on top of the frame with a string and then you can work on the motors without wobbly maneuvers.
Where are the new mk3 z tops you said you were working on? Am I missing something?
On my thingiverse account, here : https://www.thingiverse.com/thing:2552246
Perhaps the description indicating compatability is only up to MK2.5. Are they fine for MK3. Maybe update the text or make it clear if there is a separate file.
For MK3 kit see https://www.thingiverse.com/thing:2779123
I updated the MK3 tops to match and couple other tweaks.
Thanks for Gregsaun for great design.
Re: Fine tune your MK3 Z axis
Following an idea from Prusa FB group, I have added a tab on the back to get a perfect alignment with the frame. My printer is quite busy these days so I did not test it yet, if someone have time to try that could be awesome. If everything is good, I will design the z-axis-top the same way.
Re: Fine tune your MK3 Z axis
Following an idea from Prusa FB group, I have added a tab on the back to get a perfect alignment with the frame. My printer is quite busy these days so I did not test it yet, if someone have time to try that could be awesome. If everything is good, I will design the z-axis-top the same way.
https://www.thingiverse.com/thing:2775169
Be careful with that; that's assuming the edge of the frame is taken as seriously as the screw holes.
Re: Fine tune your MK3 Z axis
Following an idea from Prusa FB group, I have added a tab on the back to get a perfect alignment with the frame. My printer is quite busy these days so I did not test it yet, if someone have time to try that could be awesome. If everything is good, I will design the z-axis-top the same way.
https://www.thingiverse.com/thing:2775169
Be careful with that; that's assuming the edge of the frame is taken as seriously as the screw holes.
mmh good point...
Re: Fine tune your MK3 Z axis
mmh good point...
Not trying to toss a turd in the punch bowl, just making a note of it. It might work out, it might not.
It reminds me of this page:
http://ottobelden.blogspot.com/2011/10/gd-multiple-datums-referenced-more-than.html
Which features were the tooling reference? We don't know. We know that the relative hole locations are important so they paid attention to those... but the edges might be a crapshoot.
Re: Fine tune your MK3 Z axis
You are totally right, we cannot guarantee the references of the holes in the frame. And if it is good now we cannot guarantee it will still be good in 6 months. I will rollback, thanks 😉
Re: Fine tune your MK3 Z axis
Following an idea from Prusa FB group, I have added a tab on the back to get a perfect alignment with the frame. My printer is quite busy these days so I did not test it yet, if someone have time to try that could be awesome. If everything is good, I will design the z-axis-top the same way.
https://www.thingiverse.com/thing:2775169
Ooh, I would not do this. I already had a discussion with someone who wanted this but I talked them out of it (I hope).
Re: Fine tune your MK3 Z axis
Ok, I am a bit lost here. There are 3 designs in this topic, made by: @RHDreambox (Originally), @gregsaun, and then @jltx.
Could someone explain what are the differences between the designs ?
Re: Fine tune your MK3 Z axis
Could someone explain what are the differences between the designs ?
I adjusted a dimension error found on Prussia's original part. The motor holder was expanded 0.5 mm so that the motor could be placed in the right place.
Gregsaun has also adjusted the motor location and added a small detachable front part so that the console can be mounted / disassembled without removing the entire Z unit.
Then Gregsaun put a bracket on the side of the motor holder, which would improve positioning and provide better support.
Personally, I think the extra support bracket is good. The frame is made of a NC cutter and the accuracy of the geometry of the frame should be within a few hundredths of mm. What can affect the accuracy is the epoxy layer (about 0.15 mm) to which the frame is treated.
Bear MK3 with Bondtech extruder
Re: Fine tune your MK3 Z axis
Could someone explain what are the differences between the designs ?
I adjusted a dimension error found on Prussia's original part. The motor holder was expanded 0.5 mm so that the motor could be placed in the right place.
Gregsaun has also adjusted the motor location and added a small detachable front part so that the console can be mounted / disassembled without removing the entire Z unit.
Then Gregsaun put a bracket on the side of the motor holder, which would improve positioning and provide better support.
Personally, I think the extra support bracket is good. The frame is made of a NC cutter and the accuracy of the geometry of the frame should be within a few hundredths of mm. What can affect the accuracy is the epoxy layer (about 0.15 mm) to which the frame is treated.
Thanks for the explanation. Do they have to be printed in PETG ? Can they be printed in ABS. I know jltx told me that printed in ABS will be too tight.
Re: Fine tune your MK3 Z axis
It should work with ABS. The dimensions of the holes have just been adjusted a little.
Should they be tight, it can be fixed with a sandpaper or a suitable drill.
Bear MK3 with Bondtech extruder
Re: Fine tune your MK3 Z axis
Ok, I am a bit lost here. There are 3 designs in this topic, made by: @RHDreambox (Originally), @gregsaun, and then @jltx.
Could someone explain what are the differences between the designs ?
Could someone explain what are the differences between the designs ?
I adjusted a dimension error found on Prussia's original part. The motor holder was expanded 0.5 mm so that the motor could be placed in the right place.
Gregsaun has also adjusted the motor location and added a small detachable front part so that the console can be mounted / disassembled without removing the entire Z unit.
Then Gregsaun put a bracket on the side of the motor holder, which would improve positioning and provide better support.
Personally, I think the extra support bracket is good. The frame is made of a NC cutter and the accuracy of the geometry of the frame should be within a few hundredths of mm. What can affect the accuracy is the epoxy layer (about 0.15 mm) to which the frame is treated.
Irawans> My design also improve the strength as top plate is 2mm thicker (and the angle brackets are longer, and some hidden features). Due to this you will need to use M3x12mm instead of M3x10mm originally. Jltx then decided to remix my design to add pocket for screws in order to use the original M3x10mm.
RHDreambox > Damned I am thinking of proposing both versions then 😀
Re: Fine tune your MK3 Z axis
Alright, I'm getting confused too... Do all these designs fix the original issue brought up by @RHDreambox?
Also, are all the designs by @RHDreambox that have been updated throughout the "Fine Tune Your..." threads available in one place?
Re: Fine tune your MK3 Z axis
Alright, I'm getting confused too... Do all these designs fix the original issue brought up by @RHDreambox?
Also, are all the designs by @RHDreambox that have been updated throughout the "Fine Tune Your..." threads available in one place?
The solution in my sig link fixes all the Z issues identified in this thread, motor offset, screw holes, smooth rod holes. Plus adds easy maintenance panel (thanks gregsaun!).
Re: Fine tune your MK3 Z axis
Have any of these issues been confirmed by Prusa? By confirmed I mean, does the Prusa R2 part release look to fix any of these issues?