Has anyone actually made Adoptabot...? [SOLVED]

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Has anyone actually made Adoptabot...? [SOLVED]

Postby lairdb » 2018-Mar-Thu-10-Mar

[SOLVED: see below update.]

I've been at it for about a month, and (after modifying about 75% of the parts) have a printer that works as long as print time is under an hour or so. If the print time exceeds an hour, the Z rod block, which next to and held in place by the X and Z steppers, gets warmed to the point where it deforms under the weight of the Y arm, leaning the hot end into the bed/print.

If you've gotten Adoptabot to work, how?

I've beefed up the Z rod block some; that doesn't seem to help. I'm considering a full Z block redesign that would beef it up enormously, but I'm concerned that would just just further delay the issue. I've also thought about changing the print head to a Bowden-style design, so the Y arm is not so front-heavy; not sure that would be enough either.

Thoughts?

Cutaway of Adoptabot; Z rod plate shown in green:

Image
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Last edited by lairdb on 2018-Mar-Fri-12-Mar, edited 1 time in total.
Simple Metal Kit, heated bed
Mods: blower fan with self-remixed blower duct
Usually PLA on kapton with AquaNet.
Usually Cura.
lairdb
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Has anyone actually made Adoptabot...? [SOLVED]

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Re: Has anyone actually made Adoptabot and gotten it to work

Postby cbxbiker61 » 2018-Mar-Thu-16-Mar

Did you print that part in ABS? That's what I would do.
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Re: Has anyone actually made Adoptabot and gotten it to work

Postby lairdb » 2018-Mar-Thu-18-Mar

cbxbiker61 wrote:Did you print that part in ABS? That's what I would do.


I'm reluctant to do so because part of the theory is that the printer can self-reproduce, and printing ABS is likely not on the table without a heated bed. (Also, I don't really have good luck with ABS, even on my Simple Metal.)

I did crosspost to /r/printrbot, and /u/MS3FGX has suggested that if my motors are that warm, I should probably turn down my motor current; I haven't tried that, but it's a good thought and I'll experiment with that next.
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Simple Metal Kit, heated bed
Mods: blower fan with self-remixed blower duct
Usually PLA on kapton with AquaNet.
Usually Cura.
lairdb
Waiting for extruder temp...
 
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Re: Has anyone actually made Adoptabot and gotten it to work

Postby lairdb » 2018-Mar-Fri-13-Mar

lairdb wrote:I did crosspost to /r/printrbot, and /u/MS3FGX has suggested that if my motors are that warm, I should probably turn down my motor current; I haven't tried that, but it's a good thought and I'll experiment with that next.


That did it. I turned motor current down from X50 Y50 Z60 to X15 Y15 Z15 and the test print worked fine, and there was no perceptible plate or case distortion. I'll probably up that to 25, just because 15 seems a little low.

There's a little more detail at the /r/printrbot thread.
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Simple Metal Kit, heated bed
Mods: blower fan with self-remixed blower duct
Usually PLA on kapton with AquaNet.
Usually Cura.
lairdb
Waiting for extruder temp...
 
Posts: 81
Joined: 2015-May-Tue-13-May
Reputation: 3

Re: Has anyone actually made Adoptabot...? [SOLVED]

Postby cbxbiker61 » 2018-Mar-Fri-13-Mar

Sounds good, yeah you should be able to get away with pretty low current since the moving mass is so small on that little printer.
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