Hello all, I'm about to endeavor to print my first copy of a Prusa. I know there are so many designs, especially the derivatives from thingiverse: [www.thingiverse.com] So heres the question: What would you include in your next Prusa build to make it more efficient? Which extruder design would you use? Please keep it a plastic discussion. I personally don't like the z-axis motors with the couplings, just the idea of the print bed hanging from something is asking for trouble. So what do you think? https://reprap.org/forum/read.php?1,89213,89213#msg-89213 Mon, 18 May 2026 06:23:40 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,89213,89683#msg-89683 https://reprap.org/forum/read.php?1,89213,89683#msg-89683 but i found that the instructions are not to my liking the hobbed bolt i got was hobbed on the threads but if i reverse the bolt
and hob the shoulder my printed parts fit much better motor mount screws clear the big gear much better and drive gear meshes nicely
i like my big head hot end as it fit my printed part first try. like its made for a Wade extruder .]]> spad007 General Thu, 07 Jul 2011 10:16:03 -0400 https://reprap.org/forum/read.php?1,89213,89681#msg-89681 https://reprap.org/forum/read.php?1,89213,89681#msg-89681
Well keep your feedback coming. More questions below:

How about your choice of X carriage for the hot tip to ride on?

Which extruder design do you prefer?

Which electronics do you prefer? (and where can I order the best cheapest one)

What x axis holders do you use? I saw this on thingiverse: [www.thingiverse.com]

Thanks again.]]> owism8 General Thu, 07 Jul 2011 09:47:06 -0400 https://reprap.org/forum/read.php?1,89213,89679#msg-89679 https://reprap.org/forum/read.php?1,89213,89679#msg-89679 www.thingiverse.com] . In fact, it uses two bits of tubing, as it connects the PVC sleeved motor shaft to the 8mm rod with a 3/8" tube. I've had no problems with slipping. BUT my motors are at the bottom on my 1X2, so the weight of the X-axis is not trying to pull them apart, so I would advise using the 1/4" sleeving and nophead's clamp for a normal Prusa with the motors at the top.

As an aside, I'm starting to print a Prusa, and it's going to have LM8UU bearings running on 8mm linear rod, which I've found very smooth and accurate on my 1X2. There are Prusa part variations on Github and thingiverse to mount bearings rather than the PLA bushes. But I don't like the motors at the top design of the Prusa - despite nophead's new coupler, I would prefer the motors at the bottom. I think this could be easily achieved by adding an extra rod at the bottom, moving the motor mounts from the top to the bottom, and using the Huxley top clamp for the Z rods. This would eliminate what I see reported as the biggest problem of the Prusa.
Anyone built a Prusa like this, or can think of any problems? To the original poster, as you can see, the most up-to-date Prusa is only limited by your imagination!]]> droftarts General Thu, 07 Jul 2011 09:26:42 -0400 https://reprap.org/forum/read.php?1,89213,89665#msg-89665 https://reprap.org/forum/read.php?1,89213,89665#msg-89665
How about the x axis holders? I saw this one: [www.thingiverse.com]

Any thoughts?]]> owism8 General Thu, 07 Jul 2011 07:21:03 -0400 https://reprap.org/forum/read.php?1,89213,89664#msg-89664 https://reprap.org/forum/read.php?1,89213,89664#msg-89664 jcabrer General Thu, 07 Jul 2011 07:20:01 -0400 https://reprap.org/forum/read.php?1,89213,89661#msg-89661 https://reprap.org/forum/read.php?1,89213,89661#msg-89661 owism8 General Thu, 07 Jul 2011 06:36:40 -0400 https://reprap.org/forum/read.php?1,89213,89655#msg-89655 https://reprap.org/forum/read.php?1,89213,89655#msg-89655
How about your choice of X carriage for the hot tip to ride on?

Which extruder design do you prefer?

Which electronics do you prefer? (and where can I order the best cheapest one)

Thanks again.]]> owism8 General Thu, 07 Jul 2011 05:26:37 -0400 https://reprap.org/forum/read.php?1,89213,89619#msg-89619 https://reprap.org/forum/read.php?1,89213,89619#msg-89619
edit: by 'slightly less' i mean the drill bit way maybe .1 of a mm less or maybe they were the same.]]> mlagana General Thu, 07 Jul 2011 00:10:09 -0400 https://reprap.org/forum/read.php?1,89213,89608#msg-89608 https://reprap.org/forum/read.php?1,89213,89608#msg-89608 Just cross drill it and the coupling and insert carter key or roll pin?
Now the motor shaft that's a different thing it's much smaller and has that flat side it seems to be slick with not much purchase.
But from what I can see no one is having a great deal of problems with it.
So if I am going to cross drill my threaded shafts I would clock the thread index* and remove one element for error.
(*That is try and drill in the same way both shafts and couplings.)
In olden times there were Two kinds of errors. Compensating error and cumulative error.
I hope that two motors will compensate for each others errors.
I have spent way too much money and time/gas. on my threaded rod finding a very straight chunk to cut two or three peices from.
So I picture the rod running true but a roll pin or carter key will allow some wobble in a not too tight clamp and not drop out.
"Henry" would have used many(hundreds in a "T".) carter keys and castellated nuts all over the thing.
and some would safety wire most every hot or moving part.
Any who that's my opinion or two cents worth..]]> spad007 General Wed, 06 Jul 2011 20:54:54 -0400 https://reprap.org/forum/read.php?1,89213,89509#msg-89509 https://reprap.org/forum/read.php?1,89213,89509#msg-89509 -------------------------------------------------------
> awesome.
>
> So Im assuming that this two motor thing has a
> reason to it right? I currently have 1 motor on
> the huxley using the gear cog system to lift the
> Z's
> What led to this two motor on top deal?
>
> Thanks for any more input. Keep it coming.


Getting everything aligned is hard enough, adding the belt/pulley combos just makes it more so. I've found the dual motor setup works pretty well, but adjusting the current properly was a little tricky. It works great during prints, but sometime pauses while given large (10mm) step changes using repsnapper. Honestly I prefer buying an extra motor and not having to worry about one more belted axis to tune regularly.]]> germanicus General Tue, 05 Jul 2011 20:57:18 -0400 https://reprap.org/forum/read.php?1,89213,89508#msg-89508 https://reprap.org/forum/read.php?1,89213,89508#msg-89508
ok so goal was simplification.]]> owism8 General Tue, 05 Jul 2011 20:54:07 -0400 https://reprap.org/forum/read.php?1,89213,89507#msg-89507 https://reprap.org/forum/read.php?1,89213,89507#msg-89507 -------------------------------------------------------
> What led to this two motor on top deal?

No need for a belt for the z-axis, simplifies things somewhat at a cost of needing an additional motor.]]> NewPerfection General Tue, 05 Jul 2011 20:17:54 -0400 https://reprap.org/forum/read.php?1,89213,89505#msg-89505 https://reprap.org/forum/read.php?1,89213,89505#msg-89505
So Im assuming that this two motor thing has a reason to it right? I currently have 1 motor on the huxley using the gear cog system to lift the Z's
What led to this two motor on top deal?

Thanks for any more input. Keep it coming.]]> owism8 General Tue, 05 Jul 2011 18:54:12 -0400 https://reprap.org/forum/read.php?1,89213,89492#msg-89492 https://reprap.org/forum/read.php?1,89213,89492#msg-89492 richrap General Tue, 05 Jul 2011 15:15:07 -0400 https://reprap.org/forum/read.php?1,89213,89225#msg-89225 https://reprap.org/forum/read.php?1,89213,89225#msg-89225 www.thingiverse.com]. Josef tells me he is putting it in his repository.]]> nophead General Sat, 02 Jul 2011 08:44:28 -0400 https://reprap.org/forum/read.php?1,89213,89218#msg-89218 https://reprap.org/forum/read.php?1,89213,89218#msg-89218 www.reprap.org]]]> owism8 General Sat, 02 Jul 2011 06:59:16 -0400 https://reprap.org/forum/read.php?1,89213,89217#msg-89217 https://reprap.org/forum/read.php?1,89213,89217#msg-89217 www.thingiverse.com].]]> Rook General Sat, 02 Jul 2011 06:41:37 -0400 https://reprap.org/forum/read.php?1,89213,89213#msg-89213 https://reprap.org/forum/read.php?1,89213,89213#msg-89213
I'm about to endeavor to print my first copy of a Prusa. I know there are so many designs, especially the derivatives from thingiverse: [www.thingiverse.com]

So heres the question: What would you include in your next Prusa build to make it more efficient? Which extruder design would you use? Please keep it a plastic discussion.

I personally don't like the z-axis motors with the couplings, just the idea of the print bed hanging from something is asking for trouble.

So what do you think?]]> owism8 General Sat, 02 Jul 2011 06:02:44 -0400