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Set up RepRap Pursa i3 Printer? Answered

I have completed the build of my RepRap Pursa i3 printer. Where do I go from here? How do I set up the printer to make it ready to plug into my computer and start printing?

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Downunder35m

3 years ago

So you are saying I should finally write a calibration guide for 3D printers? ;)

Well until then let's try the basics first:
Endstops, motor directions.
Set the axis manually to an area free of the end stops.
Check in the printer software if the corresponding axis moves in the right direction.
If not change the setting in the firmware.
Now be ready to hit the emergency stop!
Home each axis and if it moves away from the endstop hit the Emergency button before the crash happens.
They home fine? All good, if not reverse the homing direction in the firmware.
Now you should be able to move all in the printer software without getting a crash or wrong direction.
Next step is the travel limit.
From the homing postion move the axis until very close to the end - note the mm it took to get there and use them in the firmware for the max travel on that axis.
Last but not least the calibration of the motor stepping.
This is a very improtant step as it is the difference between good and useless prints!
You'll need digital calipers.
Move the caliper out and place them so the pin for checking depths is placed against the axis.
Press zero on the calipers and let the axis move 10mm.
Adjust the stepping through the GCode commands until satisfied, then set the same values in the firmware permanently.
If unsure about the right GCodes please refer to the Reprap Wiki as it is very well documented.

All up and done properly should take about 4 to 5 hours.
After that it is bed levelling and getting the endstop for the z-axis positioned and you are good to go :)

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liquidhandwashDownunder35m

Answer 3 years ago

Thanks downunder, your instructions helped, and its working correctly now. Most of it was there was an asterisk * in the steps per mm code for some reason, making every thing go nuts

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Downunder35mliquidhandwash

Answer 3 years ago

Problem with standard firmwares is that they re never optimised for your machine.
But as you noticed getting it right is relatively simple.
Hard part is to adjust the motor stpes so they are really accurate but it is a step you will enjoy one you start printing.

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liquidhandwash

3 years ago

I have a student who has just built one and he his also having some problems with the software side of it. So we would both be interested in some guidance, or a good web link.

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Downunder35m

3 years ago

By doing some reading in the Reprap forums.
With no clue there is little use to spent several days here explaining the basics of 3D printing.
Start with the basic calibrations and work your way up from there.