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Prusa Mendel 2.0 Question

Posted by epochapex 
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epochapex
Prusa Mendel 2.0 Question
February 06, 2012 11:46AM
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.
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Mazaw
Re: Prusa Mendel 2.0 Question
February 06, 2012 03:41PM
How long are your X smooth rods? I was able to continue the build by adding an extra set of nuts on the top threaded rods spacing the Z motor mounts farther out from the vertexes to match the extra X distance. The threaded rod at the bottom was just barely long enough to clamp the Z smooth rods in the appropriate place.
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NelsonRap
Re: Prusa Mendel 2.0 Question
February 06, 2012 06:51PM
400mm instead of the normal 420mm

__________________________________________________________________________
Experimenting in 3D in New Zealand
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epochapex
Re: Prusa Mendel 2.0 Question
February 07, 2012 09:36AM
Mazaw — thanks for the input. I was thinking that might be a solution, but ended up buying a hacksaw instead of the nuts.

NelsonRap — thanks. I'm sure your answer will be helpful to others, since there's no documentation about this right now (as far as I know).
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epochapex
Re: Prusa Mendel 2.0 Question
February 13, 2012 09:46AM
OK. I cut the bars to 400mm and was able to align them correctly.

Right away I have bumped into another roadblock and have a question.

The couplings of the Prusa 2.0 build that I have, which go on the NEMA 17 strepper motors and connect to the threaded rods that drive the vertical axis, don't fit on the axels of the strepper motors. I have tightened the end of the coupling that is supposed to go on the strepper motors to it's maximum, but ithe hole is a bit too big, by a mm or two.

Anyone have any ideas what I can do to fix this? Am I missing something? Do I need to go to my local hacker space and print out the 1.0 couplings or is there another option?
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JoeDaStudd
Re: Prusa Mendel 2.0 Question
February 13, 2012 10:12AM
The Z coupling are nophead's with the 4 bolts right?

You need some plastic tubing around the motor shaft (it helps cancel the Z wobble).

My Reprap blog

jds-reprap.blogspot.com
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nophead
Re: Prusa Mendel 2.0 Question
February 13, 2012 10:46AM
[hydraraptor.blogspot.com]

[www.hydraraptor.blogspot.com]
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epochapex
Re: Prusa Mendel 2.0 Question
February 13, 2012 01:55PM
Perfect. It looks like I was missing that piece of documentation.

Now, I just hope I can find a good source for that tubing in Toronto.


Thanks so much for the help. smiling smiley

Edited 1 time(s). Last edit at 02/13/2012 01:57PM by epochapex.
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NelsonRap
Re: Prusa Mendel 2.0 Question
February 13, 2012 06:35PM
Somewhere like Home depot or the Canadian equivalent. I'm in NZ but have been to Toronto a log time ago so don't know what your hardware stores are anymore

__________________________________________________________________________
Experimenting in 3D in New Zealand
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davejones
Re: Prusa Mendel 2.0 Question
February 14, 2012 03:06AM
Aquarium air line tubing. Available from any pet or aquarium store.
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epochapex
Re: Prusa Mendel 2.0 Question
February 14, 2012 09:44AM
Thanks. I will check out those locations.

I will probably also have more questions. Using a kit for the first iteration with second iteration parts has been a challenge.
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epochapex
Re: Prusa Mendel 2.0 Question
February 27, 2012 09:38AM
OK. I have another question.

What size M3 screw do I need to attach the NEMA motor to the x-end-motor part?

It seems the small screws I have are too small and the next size up are too big.
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NelsonRap
Re: Prusa Mendel 2.0 Question
February 29, 2012 01:52AM
On mine it is m3 10mm but for the extruder motor I have to use m3 12mm

__________________________________________________________________________
Experimenting in 3D in New Zealand
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epochapex
Re: Prusa Mendel 2.0 Question
February 29, 2012 09:28AM
Thanks. I will have to go buy some more metric screws I think.
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epochapex
Re: Prusa Mendel 2.0 Question
March 12, 2012 11:46AM
I think for some reason I need a 12mm M3 bolt to fasten the NEMA motor to the x-end-motor part for the Prusa 2.0. The 10 mm ones are not working. Since, the documentation for the 2.0 is lacking I don't know for sure what I need.

Where can I find a 12mm M3 bolt? I can't even seem to find any locally. I checked two hardware stores already and looked online, but all they sell are kits, which don't have 12mm.

Argh, this is so frustrating.
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jakowisp
Re: Prusa Mendel 2.0 Question
March 12, 2012 01:35PM
I had issues finding those sizes in California. Homedepot, Lowes, and ACE did not carry them. BUT Orchad Supply Hardware had M3 sizes varying from 8mm to 20mm.
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epochapex
Re: Prusa Mendel 2.0 Question
March 12, 2012 02:02PM
Unfortunately, I don't have access to Orchad.

I found an online store for M3s bolts.

Are these the right kind?

http://www.fastener-express.com/metric-socket-head-cap-screw-stainless-black-oxide-.aspx

Edited 1 time(s). Last edit at 03/12/2012 02:05PM by epochapex.
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jakowisp
Re: Prusa Mendel 2.0 Question
March 12, 2012 02:23PM
Those look good.

A correction to my last post.
That should have been "Orchard Supply Hardware."
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epochapex
Re: Prusa Mendel 2.0 Question
March 12, 2012 03:20PM
Thanks for posting. I think Orchard is US only.

Here's a vendor that someone told me of which has outlets in Canada too:
[www.fastenal.com]
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Roboteernat
Re: Prusa Mendel 2.0 Question
March 12, 2012 07:47PM
If you need bolts quick and cant get out, another source is ebay! there often alot cheaper too grinning smiley
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NelsonRap
Re: Prusa Mendel 2.0 Question
March 12, 2012 08:02PM
That's the type of bolt I use here in NZ I use them for the whole build, if you get really stuck I could probably ship some from here

epochapex Wrote:
-------------------------------------------------------
> Unfortunately, I don't have access to Orchad.
>
> I found an online store for M3s bolts.
>
> Are these the right kind?
>
> [www.fastener-express.com]
> -cap-screw-stainless-black-oxide-.aspx

Edited 1 time(s). Last edit at 03/12/2012 08:03PM by NelsonRap.

__________________________________________________________________________
Experimenting in 3D in New Zealand
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epochapex
Re: Prusa Mendel 2.0 Question
March 13, 2012 01:44PM
Hey Jakowisp, Roboteernat and NelsonRap,

Thanks for the tips and verification. I think I will just order these from fastenal.com or ebay.

I think once I have these and some extras just for in case I should be OK to get through the rest of this build.... I hope.

Edited 1 time(s). Last edit at 03/13/2012 01:46PM by epochapex.
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epochapex
Re: Prusa Mendel 2.0 Question
March 21, 2012 09:39AM
So I skipped ahead a step to try to assemble Greg's accessible extruder and got stuck again.

The nut traps seem to be too small for the M3 nuts. How do I get them in there?
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jakowisp
Re: Prusa Mendel 2.0 Question
March 21, 2012 01:27PM
I used a small paint brush and acetone to enlarge holes on my build.
I had an issue with the hobbed bolt hex head not fitting the gear. Also the 608 bering holes were too small.
A bit of acetone applied to the edges with the bush softened the ABS and allowed me to insert the bolt head/bearings.

Same should work for the nut trap.
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epochapex
Re: Prusa Mendel 2.0 Question
March 21, 2012 01:30PM
Thanks I will try that. smiling smiley
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nophead
Re: Prusa Mendel 2.0 Question
March 21, 2012 02:27PM
I think Josef makes his nut traps deliberately tight and recommends pushing the nuts in with a hot soldering iron.

[www.hydraraptor.blogspot.com]
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epochapex
Re: Prusa Mendel 2.0 Question
March 28, 2012 12:50PM
Thanks for the suggestions. I used Acetone and it worked. I might have used a soldering iron, but don't have one.

The extruder is all done. smiling smiley
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epochapex
Re: Prusa Mendel 2.0 Question
May 30, 2012 01:08PM
After a long break, I am determined to finish this printer. I just have to get the hot end and the heated bed finished, then do the electronics.

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 smiling smiley

Edited 1 time(s). Last edit at 05/30/2012 01:09PM by epochapex.
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Attachments:
open | download - borosilicate%2520glass.jpg (86.6 KB)
epochapex
Re: Prusa Mendel 2.0 Question
June 04, 2012 01:25PM
I guess the image was hard to see or maybe hard to answer.

Maybe I should go with an arcolt hot end instead? I am at a loss for how these attach to the actual extruder though.
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nophead
Re: Prusa Mendel 2.0 Question
June 04, 2012 02:51PM
If it the same as a normal Wade's extruder it should have a 16mm hole in the bottom with two screw holes cutting through it. You insert the PTFE and drill though the holes and insert long self tappers or tap it M3 and put M3x30 bolts through.

Edited 1 time(s). Last edit at 06/04/2012 03:24PM by nophead.

[www.hydraraptor.blogspot.com]
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