MK2S Pinda probe version 2?  

Re: MK2S Pinda probe version 2?

I have upgraded my printer from MK2 to MK2S and honestly there is no big difference in using from using the old mount versus the new mount. I guess a couple differences would be that the new mount is less likely to break accidentally if you hit it somehow. Also, on the old mount the nut can unscrew over time, but on the new mount that is less likely to happen.
So is it worth it? It depends. I would say that if it's working good right now, then there is no need to print a new part. If you really want to though, you can find it here http://www.prusa3d.com/prusa-i3-printable-parts/
Download the MK2S version STLs and find the right file there.

Re: MK2S Pinda probe version 2?

So, I had the original MK2. I printed and upgraded to the MK2S (two screw) and think it is better and worth it. I recently upgraded to the MMU and it comes with a single screw version. So I guess I have done them all.

I think the S versions are significantly better than the MK2 version. I see no real difference between the one screw and two screw versions, other than needed to do two screws. Both are secure. If you can't find the files for the single screw version, don't worry about it, print the two screw version.

Re: MK2S Pinda probe version 2?

If I may add my two cents, I am not a fan of the design. As a MK2S kit owner, I set the PINDA using manual's photos that are rough at best and crashed my bed quite badly. In correcting the issue, I noticed thread scoring in PINDA clamp (mine had one screw hole) that force adjustment to "snap" per thread which was very inaccurate. Rotating the probe would yield desired accuracy as per older designs but because of the captured wire assembly turning probe causes some contortions of wire I didn't like at all. PINDA adjustment is, at the end of the day, just to keep from crashing as thermally induced inaccuracy seen all over the forums makes above criticism pedantic. But still, country-rigged design IMHO. I expected better. 😥

Re: MK2S Pinda probe version 2?

All good points, they really are. I see it as such....

I have a MK2 that is on it's third extruder body with the original PINDA mount with the two nuts. I have never had a crash or broken a mount in the original form. I do hate having to adjust it as I typically threadlock one of the nuts at the end. But in reality, I have only had to do this a handful of times. Like I said, never broken one.

The newer design, albeit the single or double screw design, seems like it would simply be easier to adjust? That is why I am considering it now.

For anyone who has ran both, did you like the newer style better for adjustment?

Re: MK2S Pinda probe version 2?

If I may add my two cents, I am not a fan of the design. As a MK2S kit owner, I set the PINDA using manual's photos that are rough at best and crashed my bed quite badly. In correcting the issue, I noticed thread scoring in PINDA clamp (mine had one screw hole) that force adjustment to "snap" per thread which was very inaccurate. Rotating the probe would yield desired accuracy as per older designs but because of the captured wire assembly turning probe causes some contortions of wire I didn't like at all. PINDA adjustment is, at the end of the day, just to keep from crashing as thermally induced inaccuracy seen all over the forums makes above criticism pedantic. But still, country-rigged design IMHO. I expected better. 😥

This is what I was hoping to learn. That newer style is using plastic threads as a guide and may not be as accurate as the two nut on the probe design.

Anyone else chime in please.

Re: MK2S Pinda probe version 2?

I have the MK2S older 2-screw design on my MK2S, and the MMU on my MK2 (one of the first batches) also has the same 2-screw MK2S-type design. The MK2S design (2 screw) makes it easier to do large adjustments (just pop it down) or small adjustments (rotate like MK2), but I don't have any experience with the newer 1-screw MK2S design to know if it's an improvement over the older MK2S. The MK2S design in general does make the PINDA more secure and less suspect to the PINDA mount itself breaking. I'm guessing that having one screw does make it even easier with one less screw to mess with, but as noted before, if it's not broke, why try to fix it? For me, I would wait until one of them breaks before upgrading to the newest design.

Re: MK2S Pinda probe version 2?

I hope this is the right place to post this. I had worked on a E3D Volcano ready PINDA adapte that also works with normal V6 hotend.
It would require complete replacement of Extruder Body part, two M3 washers and M3 x40 fully threaded screw. Others can be found in Kit's spare pack. I'm not posting it yet because I need to add PTFE tube receiver improvement as the current one is a pain to replace filament, but that is for another thread.

Input welcome.

Re: MK2S Pinda probe version 2?

Download the MK2S version STLs and find the right file there.

The STL there, and on github, is the "old" MK2S design with 2 screws instead of 1. I cant find the STL for the new one either. For most people, this probably doesnt matter, but I would like to have the STL for the new design, so I can use that as basis for a Volcano mod. I just made a first attempt based on the "old" 2 screw design, basically stretching the pinda holder:

https://www.thingiverse.com/thing:2535500

The 1 screw design might make this a little neater.

stephanpark; your design is probably even better, but frankly, I dont need adjustability, as I dont plan on swapping hotends. Once I get the volcano (and a 0.4mm nozzle for it), why would I ever want to print with the V6 again? So the original design works just fine for me. I believe you added a glass plate to your bed? That might explain why fine control over pinda probe positioning is critical for you. If you add 3mm to the bed, you lose 3mm pinda probe range (potentially even more). But for most people, the course adjustment of one groove at a time, is more than precise enough, you can do the rest with Live Z adjustment.

Re: MK2S Pinda probe version 2?

I modified the original STL to mimic the new design and I also added optional slots for optional 3mm square nuts for the extruder fan bolts.
Here is the link: https://www.thingiverse.com/thing:2541665

Re: MK2S Pinda probe version 2?

@Bob
3mm loss is due to wrong IGUS bearings. Wrong product number but it fit the chassis with aforementioned loss of Z-height. The design is for people who want the accuracy of the original design but the strength and convenience of newer design. It just happen that adapting the idea to support Volcano was easy. Live Z is great for a tinker but for someone trying to get professional work out of MK2S, resetting Z every print is problematic. An accurate PINDA Z to start would be good...that being said, PINDA is very thermally flaky so I Live Z with ABS every time.

@Harry
If you are htgani, the mesh you posted has very low STL accuracy and near unusable. I would recommend you export at a higher resolution to retain surface accuracy on curved surfaces. Not enough of an upgrade for me though. 😐

Re: MK2S Pinda probe version 2?

You should probably tell Prusa about their poor design, since all I did was modified their original STL.
I printed about half dozen variation for use on my Haribo Edition, they all came out perfect; but then again, if you know what you want and you know how to do it, you shoud have done it yourself.

Re: MK2S Pinda probe version 2?

Yup, totally agree. I've rebuilt 50% of my MK2S with "better" parts because, fun! Then again, if you have money and you have better things to do, there is a printer for every budget. MK2S is the right balance of quality vs. reputation vs. viability of warranty support for myself, and apparently many more so you can take your clone and print it. See what I did there? And yes, Prusa's provided STL is quite low res for mod work. Kind of a pain too. I prefer NURBS so for me, it is SCAD to STP to NURBS then export at high res when needed such as this particular part.

Sorry Aaron for the detour.

Re: MK2S Pinda probe version 2?

I modified the original STL to mimic the new design and I also added optional slots for optional 3mm square nuts for the extruder fan bolts.

Thanks a lot (and there is absolutely nothing wrong with the STL).

Unfortunately for me, it doesnt help for my volcano, as the single hole is still a little too far up for me to just "stretch" the vertices. Since you seem able to modify the scad (I cant even compile it for some reason), could I ask a favor? If you could make a variant with the pinda probe holder being ~8.1mm longer, stretching towards the print bed, move the screw an equal amount, and add more grooves, maintaining their relative distance, you'd probably have a perfect Volcano mod.

Also, can you tell me how you open the scad file? I have openscad 2015.03 on a pretty decent PC (core i5, 16GB ram,..) I can open and compile extruder-cover with no problems, but extruder-body just hangs when I open it. Warning: normalized tree is growing past 200K elements". Im using windows, maybe you are using linux or mac?

Re: MK2S Pinda probe version 2?

And yes, Prusa's provided STL is quite low res for mod work. Kind of a pain too.

They provide the scad files, which you can render yourself. At least some people can, I cant. But nothing useful is gained from curvy surfaces and bevelling corners; if anything, its likely to mess up the print. Your screenshot shows a design with, AFAICT, not one printable flat surface.

Re: MK2S Pinda probe version 2?

Hey Bob,
You did notice I already work in NURBS which was a near as directly from SCAD provided by mothership herself, no?
Just in case you think STL is the best driver of FDM technology, let me just state one fact. gcode supports arcs. STL does not, slicers are slave to imported models so no arc instructions are given to define surface detail adding yet another layer of compromised interpolation to finally output to our glorified robot icing bag. So you are using what amounts to a GIF when you could be using a vector file. Can you not appreciate the gob-smacking stupidity of this?

Also, you seem to be having trouble with file conversion. And in case the clone owner lurking in a manufacturer's own forum doesn't respond to you (I'm just messing with you brother), I will be more explicit on what I did to get usable files from SCAD provided.
1. OpenSCAD, compile (F6)
2. Export to CSG
3. FreeCAD export to STEP
STEP is as widely used as the obsolete STL file format (had to do it) so you should be good from there. Do take care though, the model won't arrive perfect as SCAD can export STL with clumsy markup but will produce untrimmed or non-watertight objects, some cleanup may be required to restore to a watertight NURBS model.

FYI, Intel i7-7700K, 64GB, M.2 1TB which is already considered obsolete by workstation standards and opening "extruder-body.csg" file takes a whole 10 seconds. OpenSCAD is horribly inefficient with resources as with most opensource software but you do get what you pay for and at least the door is open if just barely. If you tell me what format you want, I can try to attach it in my reply.

Again, sorry Aaron.

Re: MK2S Pinda probe version 2?

Thanks a lot (and there is absolutely nothing wrong with the STL).

Unfortunately for me, it doesnt help for my volcano, as the single hole is still a little too far up for me to just "stretch" the vertices. Since you seem able to modify the scad (I cant even compile it for some reason), could I ask a favor? If you could make a variant with the pinda probe holder being ~8.1mm longer, stretching towards the print bed, move the screw an equal amount, and add more grooves, maintaining their relative distance, you'd probably have a perfect Volcano mod.

Also, can you tell me how you open the scad file? I have openscad 2015.03 on a pretty decent PC (core i5, 16GB ram,..) I can open and compile extruder-cover with no problems, but extruder-body just hangs when I open it. Warning: normalized tree is growing past 200K elements". Im using windows, maybe you are using linux or mac?

Try this https://www.thingiverse.com/thing:2546875

Re: MK2S Pinda probe version 2?

Hi,

Prusa just updated their printed parts github files with the 'new' version. Check out:
https://github.com/prusa3d/Original-Prusa-i3/blob/MK2S/Printed-Parts/scad/extruder-body.scad
https://github.com/prusa3d/Original-Prusa-i3/blob/MK2S/Printed-Parts/stl/extruder-body.stl

Re: MK2S Pinda probe version 2?

Thanks Waldermar, will do.