Prusa Mendel 2.0 Question What should the length of the smooth bars between the x-end-motor and x-end-idler be for Prusa iteration 2? I bought a kit for iteration 1 and the bars are too long. https://reprap.org/forum/read.php?4,117473,117473#msg-117473 Sun, 10 May 2026 20:05:09 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,117473,163543#msg-163543 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,163543#msg-163543 epochapex Reprappers Tue, 30 Oct 2012 12:28:54 -0400 https://reprap.org/forum/read.php?4,117473,162950#msg-162950 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,162950#msg-162950 brnrd Reprappers Fri, 26 Oct 2012 15:46:54 -0400 https://reprap.org/forum/read.php?4,117473,162740#msg-162740 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,162740#msg-162740
I tried swapping the connections and the pololu boards.

I think I have some problems with my RAMPS board like this person:
http://forums.reprap.org/read.php?160,112613]]> epochapex Reprappers Thu, 25 Oct 2012 11:20:56 -0400 https://reprap.org/forum/read.php?4,117473,159823#msg-159823 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,159823#msg-159823
Thanks so much for this suggestion. I don't think I would have thought of that or found it easily. I'll give it a try.

It seems like there needs to be a lot of iteration to eliminate problems that might have multiple causes. I've definitely found that to be true. Once this thing works, I'm going to try never to move it. LOL :D

By the way, what did you mean with the statement below? I'm slightly confused.

akhlut Wrote:
-------------------------------------------------------

> And the bed is the Y-axis, and the X-axis has the
> extruder.]]> epochapex Reprappers Wed, 10 Oct 2012 13:45:15 -0400 https://reprap.org/forum/read.php?4,117473,158910#msg-158910 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,158910#msg-158910
Home the Z-axis then enter

g0 z100

into the box on the lower right side in pronterface and click send. While the Z is traveling upward adjust the pot to eliminate the stutter. DO NOT SHORT OUT THE POLOLU - BE CAREFUL. Or it could be $15 down the tubes...

And the bed is the Y-axis, and the X-axis has the extruder.]]> akhlut Reprappers Fri, 05 Oct 2012 15:30:48 -0400 https://reprap.org/forum/read.php?4,117473,158889#msg-158889 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,158889#msg-158889
I recently recorded my 3D printer on video and posted it on youtube:

https://www.youtube.com/watch?v=1Sing5S8knA&feature=plcp

(The volume is really low, so you're going to have to turn it up.)

I was wondering if anyone can give a me a tip on what's happening to the Z-motors. I've had difficulty troubleshooting them because the problem keeps changing.

First one of the motors had to be replaced, then they were shuddering, then they just didn't work; and now they work, but get stuck.

It seems to be a mechanical problem. Correct?]]> epochapex Reprappers Fri, 05 Oct 2012 13:25:41 -0400 https://reprap.org/forum/read.php?4,117473,150015#msg-150015 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,150015#msg-150015
I found a clue to my z-motor problem here: http://forums.reprap.org/read.php?13,32930 I think the motor is actually defective because when I actually turn it while disconnected it gets stuck after a few turns. The guy in the thread above has the same problem. So it looks like I need a new motor or could tinker with the old one.

The x motor seems like the potentiometer is too high and the y motor has a problem with the end stop — it seems the endstop could be connected in reverse. If they're connected in reverse the motor only goes in one direction.]]> epochapex Reprappers Thu, 23 Aug 2012 16:09:55 -0400 https://reprap.org/forum/read.php?4,117473,149459#msg-149459 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,149459#msg-149459
I tried your method, but the increments on my voltage meter are way too small to tell me if it's at .4V. It's a scale up to 300. I'm a total noob at using a voltage meter too.

I checked all the connectors again to make sure they were connecting ot the chip and it got rid of the noise for the most part.

Now the x motor works fine, but the chip gets really hot to touch.

The y motor now seems to have the buzzing/pulsing issue. When I turn the screw it goes from not working at all to sort of jerkiing but only in one direction.

The z motor gets stuck on one side and wont turn properly, but it's not the motor because I feel it getting stuck when I turn it with my hand. So I think that might be because the z axis not straight enough.


Sigh..... I just can't wait till this thing works.]]> epochapex Reprappers Mon, 20 Aug 2012 22:28:49 -0400 https://reprap.org/forum/read.php?4,117473,148724#msg-148724 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,148724#msg-148724 epochapex Reprappers Fri, 17 Aug 2012 10:06:51 -0400 https://reprap.org/forum/read.php?4,117473,148618#msg-148618 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,148618#msg-148618
If they are proper pololu drivers you measure volts between the 2 points marked in red on the attached picture and adjust till you hit 400mV or .4V thats a good starting point to then make minor adjustments to the pot to tune it correctly.

[img.photobucket.com]

If they are not true pololu's but copies then try the above, if it doesnt work go all the way down to .050V and start increasing in .025V increments till you get one motor disconnected for the belts adjusted nicely and then adjust the other to the same starting point.

hope that helps,

GaZ]]> gazob Reprappers Thu, 16 Aug 2012 21:41:57 -0400 https://reprap.org/forum/read.php?4,117473,148537#msg-148537 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,148537#msg-148537
So I finally tested my motors and there are some issues that I need to resolve.


The X motor is buzzing/pulsing. I read this thread [[url=http://forums.reprap.org/read.php?219,86951]http://forums.reprap.org/read.php?219,86951[/url]] and turned down the potentio meter, but it simply goes from pulsing to buzzing and then back to pulsing when I complete a turn. Touching the heat sink feels like it's overheating. How many times am I supposed to keep turning it?

The Y motor was working fine before, but now it just wont work. I swapped the pololu for the X motor after I stripped the screw, so maybe that caused this new problem?

The Z motor was moving in one direction but not the other. Is this a wiring/soldering issue?

How can I resolve these problems? Your help is greatly appreciate.]]> epochapex Reprappers Thu, 16 Aug 2012 10:40:53 -0400 https://reprap.org/forum/read.php?4,117473,147407#msg-147407 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,147407#msg-147407 epochapex Reprappers Fri, 10 Aug 2012 09:10:09 -0400 https://reprap.org/forum/read.php?4,117473,147349#msg-147349 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,147349#msg-147349 nophead Reprappers Fri, 10 Aug 2012 04:27:07 -0400 https://reprap.org/forum/read.php?4,117473,147172#msg-147172 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,147172#msg-147172
I will definitely hook up the ground.

Newbie question: What is the ground wire in this image connecting to? Rats Nest

Just out of interest, I have attached a photo of how the rest of my printer is looking.]]> epochapex Reprappers Thu, 09 Aug 2012 09:35:03 -0400 https://reprap.org/forum/read.php?4,117473,147077#msg-147077 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,147077#msg-147077 NewPerfection Reprappers Thu, 09 Aug 2012 02:43:42 -0400 https://reprap.org/forum/read.php?4,117473,147048#msg-147048 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,147048#msg-147048
Does it look terribly unsafe?

I turned it on and the green LED lights up, but there's no fan sound. Is there supposed to be one?]]> epochapex Reprappers Wed, 08 Aug 2012 20:40:38 -0400 https://reprap.org/forum/read.php?4,117473,145543#msg-145543 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,145543#msg-145543 epochapex Reprappers Tue, 31 Jul 2012 09:13:31 -0400 https://reprap.org/forum/read.php?4,117473,145419#msg-145419 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,145419#msg-145419 Andrew Smith Reprappers Mon, 30 Jul 2012 16:54:54 -0400 https://reprap.org/forum/read.php?4,117473,145415#msg-145415 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,145415#msg-145415
Thanks again for the fantastic reply. I think this will be useful for others as well, since I couldn't find much about this. I'll consider your advice in detail. That housing looks awesome thanks for sharing the STL.

I was wondering about connecting an on/off switch as well.
How would I connect the wires from that to the inlet/power supply? I was searching for a long time and didn't find an answer. Do I connect the live to live and neutral to neutral like a DC switch or would I connect the live wire on both sides of the switch? An the middle is ground right? So I should connect that if I don't want to trust my life to a random chinese company?

This one looks close to the one I have:


Sorry I am a total noob to electronics.
]]> epochapex Reprappers Mon, 30 Jul 2012 16:14:15 -0400 https://reprap.org/forum/read.php?4,117473,145410#msg-145410 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,145410#msg-145410 reprap.org].

In the UK Live is brown, Blue is neutral and and green / yellow is earth. If you are not in the UK the wire colours will be different.

It isn't safe in that condition because the mains connections are exposed but I like to live dangerously and there are no children or animals in our house.

I took it to a Maker Faire this weekend so I had to make it safe for the public. I printed a cover that goes over the three mains connections and has holes for a panel mounted IEC inlet, STL attached.



To be counted as safe no single fault should create a dangerous condition. That means all main wiring must have two layers of insulation between it and people and between it and the low voltage wiring. Inside the box the mains wires are insulated and the box provides the second level of insulation. The connections to the IEC inlet have heat shrink sleeving over the solder joints and at the PSU end I used insulated ring terminals.

I have seen designs that have one cover over all the connections. That would not be considered safe unless there was something to ensure that if a mains lead came loose it could not touch the low voltage leads.

I also added a link between mains earth and 0V. Electronically it is better to let the 0V rail float as it prevents ground current flowing in the USB cable. The isolation transformer inside the PSU should be certified to be safe with double insulation and separate bobbins for primary and secondary. If you don't trust your life to a random Chinese company then connect the link.
]]> nophead Reprappers Mon, 30 Jul 2012 15:49:32 -0400 https://reprap.org/forum/read.php?4,117473,145393#msg-145393 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,145393#msg-145393
New questions

How do I wire a plug outlet and rocker switch to this 12V power supply?
(I'm not sure which wires go where on the switch and outlet.)



Also, how do I make sure I wont electrocute myself? There's no plastic housing and all I have is kapton tape.
]]> epochapex Reprappers Mon, 30 Jul 2012 13:57:50 -0400 https://reprap.org/forum/read.php?4,117473,140408#msg-140408 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,140408#msg-140408 nophead Reprappers Thu, 28 Jun 2012 10:26:20 -0400 https://reprap.org/forum/read.php?4,117473,140399#msg-140399 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,140399#msg-140399
So it looks like the plain PTFE insulator will work without any additional pieces.

I didn't fully understand the bit about two versions for Greg's extruder, but I am assuming it has to do with the SCAD code on the instructions of that page.

OK, now I just have to buckle down and finish this sucker. X(]]> epochapex Reprappers Thu, 28 Jun 2012 09:28:33 -0400 https://reprap.org/forum/read.php?4,117473,140286#msg-140286 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,140286#msg-140286
Quote

Would I need to oder wooden mounting pieces from MakerGear?

Not unless you have a groove mount hot end. The mixshop one you linked to just looks like a plain PTFE insulator. The Greg's extruder you linked has two versions. The second one for Wildseyed looks like it would work.]]> nophead Reprappers Wed, 27 Jun 2012 16:21:29 -0400 https://reprap.org/forum/read.php?4,117473,140280#msg-140280 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,140280#msg-140280
Here's the extruder I have (Greg's Hinged Accessible Extruder):

[www.thingiverse.com]

I'm not sure if the mounting options are the same as Wade's Geared Nema 17 Extruder:

[www.thingiverse.com]

Would I need to oder wooden mounting pieces from MakerGear?

[www.makergear.com]
(last option)

Building this printer is way hard. It's almost been a year. I just have to get the hot end finished and wire the electronics.]]> epochapex Reprappers Wed, 27 Jun 2012 14:52:55 -0400 https://reprap.org/forum/read.php?4,117473,136136#msg-136136 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,136136#msg-136136
That seems easy enough.]]> epochapex Reprappers Mon, 04 Jun 2012 16:42:51 -0400 https://reprap.org/forum/read.php?4,117473,136121#msg-136121 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,136121#msg-136121 nophead Reprappers Mon, 04 Jun 2012 14:51:46 -0400 https://reprap.org/forum/read.php?4,117473,136108#msg-136108 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,136108#msg-136108
Maybe I should go with an arcolt hot end instead? I am at a loss for how these attach to the actual extruder though.]]> epochapex Reprappers Mon, 04 Jun 2012 13:25:56 -0400 https://reprap.org/forum/read.php?4,117473,135290#msg-135290 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,135290#msg-135290
For the hot end, I have a question:

How do I get the hot end supplied in the mixshop kit attached to the prusa 2.0 geared extruder part? (image attached)

Here's the link for the hot end instructions:
http://forum.mixshop.com/viewtopic.php?id=8

Thanks :)]]> epochapex Reprappers Wed, 30 May 2012 13:08:47 -0400 https://reprap.org/forum/read.php?4,117473,126332#msg-126332 Re: Prusa Mendel 2.0 Question https://reprap.org/forum/read.php?4,117473,126332#msg-126332
The extruder is all done. :)]]> epochapex Reprappers Wed, 28 Mar 2012 12:50:57 -0400