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Author Topic: Home Made 3D Printer  (Read 13372 times)

TommeyLeeReed

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Home Made 3D Printer
« on: December 11, 2014, 05:39:48 AM »


Hi All,

I wanted to 3d print this 2014 pulse motor build off, but I still have to calibrate it.

This is my 3D printer:

https://www.youtube.com/watch?v=PHldG8atIWY

Tom
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MarkE

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Re: Home Made 3D Printer
« Reply #1 on: December 11, 2014, 07:36:23 AM »
Tommey it looks like you are pretty close. 

One comment:  I would think that you would want something flat and dimensionally stable like a sheet of glass for the platen.

BTW what did you end up using for your step motor driver boards?  Those amazingly cheap Chinese Allegro A4988 based boards are really only good to about 1A.  I like the A3979 which can really and truly handle 2A, but a clean PCB layout really requires 4 layers.
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TommeyLeeReed

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Re: Home Made 3D Printer
« Reply #2 on: December 11, 2014, 12:38:54 PM »
Hi Mark,

I'm using at90usb1286 board, it was a pain to load but it's a good board.


My 3d printer is fast, but have problem when printing and the extruder goes very slow when running code.

When in control mode, its as fast as it can melt the plastic....
 Tom
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MarkE

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Re: Home Made 3D Printer
« Reply #3 on: December 11, 2014, 09:25:01 PM »
Tommey, I was asking about the motor drivers themselves, the devices that actually connect to the motor, not the microcontroller.

The problem with the extruder is probably a bug in the code.  If you send me what you are using I might be able to offer some suggestions.
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TommeyLeeReed

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Re: Home Made 3D Printer
« Reply #4 on: December 12, 2014, 12:25:29 AM »

Hi All,

Did a little calibration on marlin software, I think this is not bad at all.

My heat was a little too high, but it's alive

https://www.youtube.com/watch?v=4ISSi_7LK0A

Tom
 
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Pirate88179

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Re: Home Made 3D Printer
« Reply #5 on: December 12, 2014, 04:10:50 AM »
Tommy:

That looks really good to me.  I can't believe you built this for that price range.

Very well done.

Bill
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TommeyLeeReed

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Re: Home Made 3D Printer
« Reply #6 on: December 12, 2014, 04:46:07 AM »
Thanks Bill,

Mark, the  at90usb1286 board has drivers built in.

The problem was Marlin config settings of stepper speeds...

Tom
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MarkE

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Re: Home Made 3D Printer
« Reply #7 on: December 12, 2014, 06:49:44 AM »
Quote from: TommeyLeeReed on December 12, 2014, 04:46:07 AM
Thanks Bill,

Mark, the  at90usb1286 board has drivers built in.

The problem was Marlin config settings of stepper speeds...

Tom
Tom thanks.  The drivers on that board are Allegro A4982s which are 2A rated, although the board does not heat sink the drivers.  I am very pleased with the step motor drivers from Allegro.  TI has some interesting offerings and they go to 1/32 step.  But it is tough to get a motor where 1/32 steps are accurate enough to be useful, and I think that the Allegro parts are a bit better thought out.
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TommeyLeeReed

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Re: Home Made 3D Printer
« Reply #8 on: December 12, 2014, 12:20:10 PM »
Hi Mark,

Yeah, this board should will do the job, I added the cooling fan to the board because of this reason of having no heat sinks also.

It seems like a better choice then arduino and ramps, but if a driver stops working, then that could be a problem in the future.

Tom

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MarkE

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Re: Home Made 3D Printer
« Reply #9 on: December 12, 2014, 03:47:57 PM »
Quote from: TommeyLeeReed on December 12, 2014, 12:20:10 PM
Hi Mark,

Yeah, this board should will do the job, I added the cooling fan to the board because of this reason of having no heat sinks also.

It seems like a better choice then arduino and ramps, but if a driver stops working, then that could be a problem in the future.

Tom
The fan sounds like a good idea.  I am of the mind that either:  Drivers should be extremely robust, and/or they should be field serviceable.  If only those Polulu RepRap boards and their clones had a little more space for heat sinks then they would be very useful in that regard.  As they are I would not put more than about an amp through them.  It's hard to beat the five for $15.00. price.  I can't even buy the A4988 chips that they use for the $3.00 assembled price.
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TommeyLeeReed

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Re: Home Made 3D Printer
« Reply #10 on: December 12, 2014, 07:47:25 PM »

Hi All,

Just about ready to print some good 3d parts.

https://www.youtube.com/watch?v=QBd35AfQtg0

Tom
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MarkE

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Re: Home Made 3D Printer
« Reply #11 on: December 12, 2014, 08:41:51 PM »
Quote from: TommeyLeeReed on December 12, 2014, 07:47:25 PM
Hi All,

Just about ready to print some good 3d parts.

https://www.youtube.com/watch?v=QBd35AfQtg0

Tom
Instead of a fan to remove heat from the extruder I would just use a temperature controller to regulate the power to it.  You ban build one on the cheap that just PWMs the heater current to maintain a balance between a set point potentiometer and a thermistor, resistance thermometer, or an amplified thermocouple.
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TommeyLeeReed

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Re: Home Made 3D Printer
« Reply #12 on: December 12, 2014, 08:51:14 PM »
Hi Mark.

It's in the G-code software already, I had it up too high at 245c.

The fan is to cool the plastic, the extruder heater has a temperature control.

This was a good print...

Tom
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MarkE

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Re: Home Made 3D Printer
« Reply #13 on: December 12, 2014, 10:11:59 PM »
It looks like you are getting your rig dialed in.
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leo48

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Re: Home Made 3D Printer
« Reply #14 on: December 13, 2014, 07:44:17 PM »
I have assembled a 3D printer for sale in mounting box
 and now I'm experiencing with wire PLA if anyone has any
 suggestion is appreciated

Leo48
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