PeterE builds a 3d Printer

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BillTodd:
Watching with interest here :clap: Can't wait to see the first parts (she's 25 - she can move herself ;-))

What sort of current do those little stepper drivers supply ?

PeterE:
Hi Bill,

The first bits will probably appear either tomorrow or during next week. Have to finish the filament roll carrier first.

Sure she would most certainly fix the move herself, but don't tell her mother .... (because she would totally and with emphasis disagree) I was asked to support with some internal decoration jobs as some of the work that was done by a "craftsman" is really not up to any standard :hammer: I will take a couple of pictures when we get full access. The immediate stuff is to add some trimmings between floor and wall in the closet.

Up to about 2A but then they get really hot! I think picclock is a better person to ask that question as he has already measured that if I remember correctly.

BR

/Peter

PeterE:
Sorry, no switch on this evening.

The rig for the filament bobin (roll) took a little longer than expected. It was one of those design as you go cases, and I had to do some pre-calculations to get it about right. Then it also needed some finish of course.

The filament carrier is in place.

The bracket fixing the carrier to the portal has a connector for the PTFE filament tube so the tube is secured in both ends.

I decided to give the carrier a bit of "design" as I wanted it to support and guide the roll to not fall off sideways.

It's all made of MDF this time, it does not need to be that strong.

On with the roll and thread the filament through the tube down to the extruder.

The filament is pulled out from the underside of the roll. I thought that would be the best as the angle towards the filament guide.

The roll stands on four simple ball bearings of skateboard type 8x22x7mm (IDxODxW). They are fitted to a shaft specially made for this purpose from material that was at hand. The brackets used are simple alu sheet items.

So the "fighting face" of the printer is done and now I can concentrate on getting the electronics to work.

Upcoming week will be interesting.

/Peter

PeterE:
Sorry, no pictures today.

Have spent a few days reading up on the setup and calibration processes. I am still following the instructions here: http://www.dragonflydiy.com/2010/10/building-prusa-i3-printer-testing-and.html as they turned out to be very good - for me at least.

So, I have assembled a little too much and have to unplug the stuff from the electronics board to do it properly. No harm done, I just see it as a test fit. The stepper drivers are supposed to be set to 0.40 to 0.45V DC at the trim potentiometer. That should obviously deliver around 1A to the motors and that should be enough according to the description. Driver temp etc should be in a good range.

When that is done each movement must be set up with end stops and all. First X, then Y, and finally Z. Following on with the extruder filament feed rate and the hotend temp control. The last thing will be the heatbed and its temp control.

I will split this into several days work due to other evening activities of varaious sorts.

/Peter

PS
At the end I want to make sure you don't get me wrong about the comment on my wife above. She really is a sweet and helpful person only wanting to help as far as she can. And in cases like the move of her youngest she just goes into overdrive in trying to help. So, my work here is actually more to calm her down a bit. I find it hard to describe this in a foreign language as my mother tongue is Swedish so I hope you bear with me.

PeterE:
OK, printer switched on for the first time ever and nothing blew up :ddb: :ddb: :ddb:

But, there were no measuring points at the specified position on the driver boards to set the voltage. The voltage of about 0.4V shall obviously be about equal to half the output current which is supposed to be 1 A or so. Since I couldn't measure I made the assumption that the trimmer is linear and with the wiper at half-way point I would arrive at that setting as well. I can always trim that later if needed.

Connected the X movement motor and end stop as per instruction and there were still no surprises. The electronics does not react though. :scratch: Connected the PC to the arduino board through the USB interface and started up the Pronterface application to set the movement. It connected to the printer nicely as expected and read a series of values like it should, but then ... an "Error=0" appeared obviously interrupting and stopping the startup sequence. :( What on earth is an error=0 :scratch:

Time to go through error messages .... :coffee:

But all in all it seems to start working slowly, we will see.

/Peter

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