Pushpull feeder test print

[Jim Young]

I'm starting to print  Mark's pushpull feeder and I began by printing the test print to gauge the axle parameters. 

After printing the test nuts and axle, the axle will not fit through any of the nuts. #6 just barely allows the axle to enter. 

Do I just need to print more nuts until one fits, more than the default of 6?

What is the correlation between the nut number and the parameter that is entered in the 3D printing parameters?

[Litterio Andrea Guainella]

Hi Jim,

> Do I just need to print more nuts until one fits, more than the default of 6?

Yes... Until fit... 

I use a very cheapest 3d printer and I had to make many attempts before I was able to find a good compromise ... I suggest a precise value that you can slightly file rather than a loose one

> What is the correlation between the nut number and the parameter that is entered in the 3D printing parameters?

Maybe this post will be useful

LAG

[Jim Young]

Thanks, LAG, that helps a lot. 

After I started this posting I went back and basically figure out a process for printing the tests - print a small range of nuts, incrementally increasing the size until one fits well.

Are the pushpull feeders working well for you? 

[Litterio Andrea Guainella]

I've printed some for testing but haven't been able to get the design right in the real machine yet.  as you may have seen from the video in the aforementioned post, simulating the movement with the hands everything seems ok.  in this post is my current configuration that does not miss a beat.

LAG

[Jim Young]

I'm interested in knowing why you have the PCB and parts Z level so high? Is it because of the semi-auto feeders you use? What are those feeders? Is there a design available?

[Litterio Andrea Guainella]

>  I'm interested in knowing why you have the PCB and parts Z level so high?

This is due to a problem described here. In fact, the greater the travel downwards, therefore the greater the error detected.

It wasn't a Z-axis tilting problem (or at least I think) because when I changed the liteplacer stock cameras to elp cameras, the problem was solved.

Today I think that next time I'm doing the setup from scratch I'm going to switch the z back to the table level.

> Is it because of the semi-auto feeders you use?

Not exactly!! Indeed I had to modify them to adapt them to the Z pcb height

> What are those feeders?

Are called passive drag feeder. you can check here and also download STL or STEP file 

> Is there a design available?

Of course. My custom version is attached.

LAG

[Jim Young]

Thanks LAG, very helpful.

I'm in the middle of a LitePlacer re-install, raising the machine to allow for more feeder options and too prevent destroying my table by drilling countless holes. Here's some pictures of the progress I'm making.

[Litterio Andrea Guainella]

Well done.

Have you considered putting your feet up like in the picture?

This increases the advantage of being able to use different t39.pngypes of feeders (ex: pushpullfeeder with reel support, Siemens Schultz, 0816, etc... )

Based on this you could use side left and side right for (semi)automatic feeder, at the bottom center the uplooking camera, at the center the pcbs, at the top simple stripfeeder.

I want to clarify that it is only a suggestion. Maybe someone more experienced than me could step in to give better advice.

I think this is a good starting point to plan your work area

LAG

[Jim Young]

Not sure what you mean. Do you mean get some longer posts for the corners and raise the machine up?

[Litterio Andrea Guainella]

Sorry Jim for not explaining myself well. what you say is correct

LAG

[kevin kropp]

Hi,

I have been working on printing them the last week or 2 i also had to run .6 on the axle and .6 on the play (ender 3 s1)

the ender 3 v2 with the bowden was not working with even .6 im guessing somewhere in the .8 realm was needed

The number as best I can tell seems to refer to the diameter in mm above the original size ex: .6 would be an 8.6mm hole for an 8mm post

I printed the main body and then kept upping the axle number(final .6) and printing the lever until i was happy with the fit

another note on the right spool i needed to ream the hole with an exacto to prevent any extra drag from friction an the axle and promote friction from the friction wheel

[Jim Young]

>> Sorry Jim for not explaining myself well. what you say is correct

No problem. I'm grateful that so many here speak and write English as well as they do.

That's an interesting idea, and one that I may explore later. Right now I just want to get some basic front oriented feeders installed. There's nothing preventing me from using the venerable 0816, other than the fact that I don't have a printer large enough to print one. Does anyone know of a trimmed down 0816 feeder design that would be printable with a Prusa Mini + ?

[Litterio Andrea Guainella]

For Prusa Mini+ if I'm not mistaken the dimensions are 180x180mm for print bed so you should be consider to split parts to print some  part obliquely.

As you can see in below image this is a 0816 complete in 200x200mm print bed but 0816 dimensions are little bit smaller

LAG