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Xnaron Printable Magnetic u-joint option for Rostock Max

Posted: Tue Apr 23, 2013 11:45 pm
by xnaron
After seeing the awesome Berrybot3D by Werner Berry I got magnet fever and had to have one. I did not have the time to cnc mill and lathe the required parts out of metal so I decided to see if I could make a printable part set. Well I did and it worked better than I could have ever hoped. I'd like to share it with the community so they can benefit from it. Please find the details below. Don't hesitate to post any questions you have in this thread. The details below are a work in progress and I will continue updating them as required.


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STL's:

https://github.com/xnaron/Xnaron-Magnarms-for-Rostock (openscad files to be uploaded in due course)


Parts:

- Magnets http://shop.revolutionmachines.com/3-8- ... 8-12pc.htm (BE CAREFUL NOT TO LET THE MAGNETS SNAP TOGETHER AND NEVER USE PLIERS ON THEM. THEY ARE FRAGILE AND CAN EASILY BREAK)
- Balls http://www.ebay.com/itm/380140413083
- Alum or carbon fiber tube x 6 @ exactly 240mm long
- 12 x 3mmx6mm cap head allen screws to be jb welded to the balls. Important: Clean the balls and the screws in an acetone bath before gluing.
- JB Weld (Mix it well)
- Assorted 3mm screws, washers and locknuts to mount the components
- CA glue

Optional Parts:

- Squirrel cage fans for cooling PLA. http://www.ebay.com/itm/180389680237
- os1r1s squirrel fan mount https://github.com/os1r1s-/misc-parts

Instructions/notes:

- Use a small dab of jb weld to glue the 3mmx6mm screw to the ball. I use one of the boom ends with the magnet in it in a vice to hold the ball. The magnet will help suck the screw down when you are gluing it. Let it cure under a lamp about 12" from the bulb.
- Use a 3mm washer under every ball on the effector and the cheapskate mounts.
- Use 3mm cap head screws to secure the cheapskate ball mounts to the cheapskate carriages.
- Use a longer 3mm screw to cut the threads for the balls in the effector and cheapskate ball mounts. Don't try and thread with the ball
- Use CA to glue the ball ends to the tubes if you don't have a push fit (don't forget to put the magnets in). Make sure all the arms are the same length.
- make sure you use 3/8" outer diameter tubes for the arms cut to exactly 240mm. This will match the firmware #define DELTA_DIAGONAL_ROD 269.0 // mm in configuration.h
- You need to #define END_EFFECTOR_HORIZONTAL_OFFSET 36.5 in configuration.h for the new effector. (if you don't do this you prints will be too large)
- The stock seemecnc hot end will work in this but don't use the standoffs. You want to keep the hotend away from the printed effector.
- I used 1/4" light ply to laser cut the all the dxfs EXCEPT for the J-Head groove mount which is thinner material.

BOWDEN Extruder:
- This bowden extruder derived from tscdan's excellent design.
- Files on my github
- Uses same ptfe pushfit that are on SeeMeCNC Rmax.
- Stepper Kysan 1040222 http://www.kysanelectronics.com/Product ... ordID=8318
- Gear on stepper from Stock Drive products. Part number: s10t05m022s0508 https://sdp-si.com/eStore/Catalog
- I am getting 60mm/s retracts with Rambo current set to 115. It is ultra quiet.

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Re: Printable magnetic u-joint option for Rostock Max

Posted: Wed Apr 24, 2013 12:57 am
by Flateric
Very nice!

Are the files up anywhere?

Re: Printable magnetic u-joint option for Rostock Max

Posted: Wed Apr 24, 2013 11:04 am
by xnaron
Flateric wrote:Very nice!

Are the files up anywhere?


Thanks. I will put them up after I run the first test which should be very soon. Stay tuned. :)

Re: Printable magnetic u-joint option for Rostock Max

Posted: Wed Apr 24, 2013 8:09 pm
by xnaron
Need to verify the geometry is correct in the firmware but it works great!




Re: Printable magnetic u-joint option for Rostock Max

Posted: Wed Apr 24, 2013 11:19 pm
by Flateric
Looks good, I wouldn't be too concerned about geometry if you have verified arm length, mounting position of balls.

I'd love to have a go at those files soon! LOL

Is holding power fairly decent? Think that it could support a dual hotend setup?

Re: Printable magnetic u-joint option for Rostock Max

Posted: Thu Apr 25, 2013 12:41 pm
by jesse
Nice, I'm interested in trying it.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Thu Apr 25, 2013 4:29 pm
by cambo3d
looks nice, I'm going to mill some mounts out of 1/8" aluminum to try out, similiar to the berry bot but based on the seemecnc plateform.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Thu Apr 25, 2013 10:29 pm
by xnaron
I'll release the files soon guys. I just want to get it printing first. this should happen this weekend.

I calibrated the bed to within 1/1000". The left tower needs a slight adjustment but the other 3 positions are dead on.


Re: Printable magnetic u-joint option for Rostock Max

Posted: Fri Apr 26, 2013 12:49 pm
by aerouta
nice

Re: Printable magnetic u-joint option for Rostock Max

Posted: Fri Apr 26, 2013 7:00 pm
by xnaron
First print in progress


Re: Printable magnetic u-joint option for Rostock Max

Posted: Fri Apr 26, 2013 8:20 pm
by xnaron
and the results


Re: Printable magnetic u-joint option for Rostock Max

Posted: Fri Apr 26, 2013 9:20 pm
by xnaron
Here is the first try on the pyramid.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 12:15 am
by xnaron
Some pics

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 3:32 am
by elqisqeyano
xnaron wrote:I'll release the files soon guys. I just want to get it printing first. this should happen this weekend.

I calibrated the bed to within 1/1000". The left tower needs a slight adjustment but the other 3 positions are dead on.



We need those files. I have been pondering this same idea, your a genius man. An affordable upgrade to the Rostock Max.

Thanks a bunch.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 4:18 am
by Flateric
xnaron wrote:Some pics


That last print sample is mouth watering its so nice.

Testing over, time for public beta test! LOL

Files......files......files.....Can you tell I am anxious for them.

Oh ya, one more thing....




FILES!

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 4:21 am
by ApacheXMD
Xnaron, so you had to drill new holes in the cheapskates to mount your printed pieces, right?

The print results look amazing!

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 8:28 am
by xnaron
ApacheXMD wrote:Xnaron, so you had to drill new holes in the cheapskates to mount your printed pieces, right?

The print results look amazing!


No I used 3mm screws in the existing holes. I used the outside holes rather then the inside ones.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 8:32 am
by xnaron
Flateric wrote:
xnaron wrote:Some pics


That last print sample is mouth watering its so nice.
!


Yeah I think that is arguably the best print I have ever made on any of my printers.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 10:46 am
by aerouta
Nice print! Looks like those joints are working out. I think your hot end also as a lot to do with the quality of the prints you are getting.
Can you post a link to that last file you printed? I would like to give that a shot soon. Also I am assuming you are using KISS?

Are the following features on or off:
Z-lift
wipe
jitter
retract

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 11:08 am
by xnaron
aerouta wrote:Nice print! Looks like those joints are working out. I think your hot end also as a lot to do with the quality of the prints you are getting.
Can you post a link to that last file you printed? I would like to give that a shot soon. Also I am assuming you are using KISS?

Are the following features on or off:
Z-lift
wipe
jitter
retract


Its the Vica Illusion Sculpture here http://www.thingiverse.com/thing:5700

zlift 0.05 (artifact of previous config. I should turn it off. 0.05mm doesn't really do anything as it is so small.)
Prime/Suck/Wipe 5/5/5
jitter 0

It does have a lot to do with the hot end. I couldn't get retraction working properly with PLA on the stock hot end. I'm running the J-Head with the 0.5mm nozzle.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sat Apr 27, 2013 11:12 am
by xnaron
elqisqeyano wrote:
xnaron wrote:I'll release the files soon guys. I just want to get it printing first. this should happen this weekend.

I calibrated the bed to within 1/1000". The left tower needs a slight adjustment but the other 3 positions are dead on.



We need those files. I have been pondering this same idea, your a genius man. An affordable upgrade to the Rostock Max.

Thanks a bunch.


Thanks! I'm writing up an article on my blog with details and I'll have the files up when I'm done.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sun Apr 28, 2013 12:05 am
by bvandiepenbos
Nice work on the printable magnetic joints. Great design.

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sun Apr 28, 2013 11:14 pm
by truenorthtrader
OMG that's amazing the print results speak for itself I didn't even think that was possible to get such good quality

Re: Printable magnetic u-joint option for Rostock Max

Posted: Sun Apr 28, 2013 11:39 pm
by xnaron
Thanks guys! I am am extremely happy with this setup. I've made a number of prints now and they all come out incredibly beautiful.

Here is an earlier video.


Re: Printable magnetic u-joint option for Rostock Max

Posted: Mon Apr 29, 2013 12:10 am
by elqisqeyano
xnaron wrote:Thanks guys! I am am extremely happy with this setup. I've made a number of prints now and they all come out incredibly beautiful.

Here is an earlier video.




Files up yet?