[Fig]

Of course gear motors are more expensive, but my Ultimaker may have no enough area to print larger wheels…

[Fig]

Chinese guy?
I have no idea how to modify your little Mendel to print drive wheels, but I’m sure all type of pulleys are OK, since I’m using MXL pulleys.

[Fig]

Great job on Reprap! It will enlarge folks of Morgan!

[Fig]

I have bought NEMA17 1.8 with 1：14 gear box, which means 2800 steps per turn on its drive rod.

[Fig]

Thanks!
Will gear motors work fine on X/Y axis? If so, I’m going to use them on X/Y axis instead of normal NEMA17, in order I needn’t to print larger drive wheels and still can keep high resolution. Certainly I need to calibrate step per angle as well.

[Fig]

At SCARA Settings in configuration.h, I want to change both “linkage_1” and “linkage_2” from 15000 to 25000. And at calculate_delta in Marlin_main.cpp, I want to change both “linkage_1” and “linkage_2” from 150 to 250.
Is there anything wrong with my settings?

[Fig]

Thanks Quentin, I’ll try again, and post the log in time.
And one more question, I printed new arms which are 100mm longer than Morgan’s you shared. Can I change “Length of inner support arm” and “Length of outer support arm” to fit for my new arms? Will it lead to lower accuracy?

[Fig]

DRV8825 or DRV8824 is OK, and 8824 works better on low current, RAMPS is low current.

[Fig]

Yeah, but it only moves in curve on X, on Y is in line.
And after I input M114, only current position I can get, but no step cal. How can I get the step cal to input M92?

[Fig]

The routine of hotend is in trouble, when I input G1 X 100, the hotend didn’t move as a line…So, I doubt it was the ratio trouble.
In addition, I use 20MXL pulleys, since the drive wheels you shared have no tooth, I want to design drive wheel with MXL teeth in order to prevent slipping.

[Fig]

And I’m going to design new drive wheels in order to make them more suitable for drive belts. So, drive ratio is important…

[Fig]

Thanks Quentin,
Do I need to buy sensors with boards like this? (http://www.ebay.com/itm/3-x-Hall-Endstops-react-magnetism-3D-printer-reprap-prusa-mendel-etc-/150872387181?pt=LH_DefaultDomain_2&hash=item2320b1ee6d)
Or just A3144E sensor is OK?

[Fig]

Hi Frank,
I bought hall effect sensors on Amazon, the type is same as yours. But they didn’t work fine, I linked them to RAMPS by wires directly, was I wrong? Do sensors need another electronic board?
Fig

[Fig]

Open it with AutoCAD is OK.

[Fig]

Thank you Quentin!
Awaiting for your nice video.
I’ve assembled arms, drive wheels and frame, but I don’t know where to buy the hall effect sensors. I searched them on ebay, but that seems different from your video shows… So, could you give me a hall effect sensor supplier’s link?

[Author]

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