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Ah, it was just an endstop malfunctioning. I came accros this very usefull command m119 that gives you status update of the endstops:

SENDING:M119
Reporting endstop status
x_min: TRIGGERED
x_max: open
y_min: TRIGGERED
y_max: TRIGGERED
z_min: TRIGGERED
z_max: open

[ate]

It is not a dead arm because I can move it around with the pronterface directional buttons, so it the pins must be okay. It is just during the homing that it stays dead. It seems that the issue must be in the bit of coding that pertains to the homing command? I have been sorting through the firmware but I am having trouble locating the bit that controls the homing.

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Now when I try to home, only the Theta arm moves while the psi arm remains locked in position. The psi arm does function when I move the hot end in x or y direction in pronterface.
Does this problem ring any bells?

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Alright! it worked, I just copy pasted the pins.h section for megatronics 3.0 in like you said and it worked.

Moving on to calibrating now… hopefully I can post a pic of the build next week. It is quite a radical adaptation of the original Morgan; a freakishly tall offspring (2meters)…

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Hi, I am building a reprap morgan using a Megatronics V3.0 board instead of the normal ramps. In the ‘morgan armlevel’ firmware that I downloaded from github it does have an option for the ‘megatronics’, but I fear that is might be for an older version. Because when I upload the firmware with the megatronics board selected, very strange things start happening when I switch on the power.
1) Has anyone had experience with using a Megatronics V3.0 board?
2) @Quentin; is the firmware you wrote suitable for megatronics v3.0 as well?

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ah, my mistake. I had that github page in mind when I typed that previous comment.

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@Robert Kuhlman; Thanks for the link (although that website is still puzzling me a bit).
Your concern about the structural stability of the prints is exactly why I’m building the printer, ie to look into stability issues of tall structures.
My main concern is the potential warping of the print material due to uneven cooling rates etc along the height of the of the printed model.

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@Quintin; i have a rather large modification in mind where i do away with the bottom platform and instead the whole 3d printer moves up and down along 2 rails using a rack and pinion system. If there is time today I would like to post a few images for every one to comment on.

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Nice one doctor K! If ever you get around to finishing that sketchup model you must definitely upload it. It’s very helpful to have a digital model to pan around to completely understand how all the parts are meant to fit together.

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ag fok I found it myself almost right away. Just in case the question is relevant to some one else:
http://sketchup.google.com/3dwarehouse/details?mid=cb498d810dfd31e885aaccba6f96ca0c

(model by dr K )

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I’m interested in increasing the height of the build volume (2 meters is what I’m aiming for). To save myself some time; can I get my hands on the complete digital model of the Morgan somewhere? I’ve been searching the website but must have overlooked the file.

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