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H Configured 3D Printer

by librav, published

H Configured 3D Printer by librav Jan 2, 2013
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OK! .......I was so very impressed by the initial design that ckaos initiated with his http://www.thingiverse.com/thing:27202 , that I decided to take it to the next level. I utilized some of his parts except for the X-Carraige , which I increased in height to provide better support for the my Bowden Hot End.

I used Stock Drive Products (sdp-si.com) largest G2 belt which is 87.323 inches (2218 mm) long (P/N A 6R51MB09060) as well as their 10mm Self Lubricating Acetal Bearings for the 10mm Z-Axis (P/N A 7Z44MPSD10MAF), as well as a Z-axis LM10LUU version bearing holder. Use whichever you prefer.

I used http://www.thingiverse.com/thing:20850 Taylors Gregs Wades MK6 filament feed for Ultimaker, by Taylor Alexander, and designed a Bowden feed mounting bracket (short and long) to accept the filament feed system. With my Filament feeder (3mm), I was trying to utilize Wired1's http://www.thingiverse.com/thing:31322 dove tailed design in my Hot end slide.This will require additional effort since my fit did not work out as anticipated.

I was shooting for a build volumn of 10"x10"x10" (394 mm x 394 mm x 394 mm). The belt length was a limiting criteria. I'll spend more time on this issue at a later time. I wanted to get a prototype platform working at this time. I'll post the Alibre files for those of you that may be using Alibre as your 3D modeling software and choose to modify my work as well as a .dxf assembly layout drawing.
Being that this is my first thingiverse publication, I kindly ask your forgivness for any mistakes I may have made. I will work toward making future postings more professional.

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I also did a corexy,
(h - bot) because he has some defects

So do you detect any skewing of the gantry during movement? I suggest actually printing objects because then any tiny irregularities in the motion will show up.

Also, what made you choose the H-bot as opposed to CoreXY belt layouts?

Not much activity on this project until school ends. I choose the H configuration because it requires less belting but I am taking a second look at Core XY.

Can you provide more info on the hot end, maybe post the design files ?

Sorry for the delay! I use the J-Head MK-IV or V. Is that what you needed Ed?

yes thanks for the information.

Can you add the X-axis rail mounts to the download, please

I used the X-axis mounts initially published by ckoas at http://thingiverse.com/thing:27202thingiverse.com/thing:27202. If that is not what you meant, explain further. Thanks

Doboz 2 (H-Bot 3D printer)
by ckaos

What make and model of stepper motors did you use for the H X&Y drive and the Z drive?

Thats what I'm after, cheers

I used 'SURE STEP' Stepper motors by Automation Direct. P/N STP-MTR-17040. I paid $16.50 each about 1 year ago.


I used Automation Direct P/N STP-MTR-17040 SURE STEP stepper motors. http://www.automationdirect.com/static/specs/surestepmotors.pdfhttp://www.automationdirect.co...

any videos or photos of output prints

Sorry, I've just been 'air printing' so far. I'm working on belt termination and tension control.

Hi, thank you for sharing this nice design. I am trying to build it. Could you please explain what did you use to mount z-motor and lead screw? The parts seem different from printed parts. Thanks in advance

I had some aluminum bar 1/4" x 2.0" which I cut into two pieces 2.5" long. I mounted the stepper motor to the top plate, and on the bottom, I bored a hole out to house a 10x22x6 bearing. I sandwiched the plate and bearing with a Misumi thrust washer (JZW10) and shaft collar (SCSJ10-6) on each side of the bearing plate. This fixes the lead screw shaft to chassis to eliminate any z-axis motion. I added three photos of the above. Should be getting back to the build shortly. Incidentally, before I started in 3D printing, I built a CNC machine which allows me to fabricate in various material medias.

Thank you for your swift reply. I am going to design something similar since I do not have CNC machine.

Sorry All, Sort of stepped aside from the build due to Holiday obligations and a couple of school science projects for a couple of neighbor children. Should be getting back into it some time in February.

Any update on your build of materials?

This is very cool. I especially like your tiny hot end! Makes my ultimaker's hot end look huge by comparison. I still have the same question as I had with ckaos' design: How badly does the cross bar skew out of square when you make fast motions? Have you considered turning the X-bars horizontally and using three linear bearings (two on one side, one on the other) for this reason?

That is a excellent printer you have engineered. Thank you for sharing it. Do you know when you will print with it, some videos would be awesome. Do you have any estimates of the travel speed in the X-Y plane?

Looks very nice, I got excited about ckaos and CoreXY in general, but never got beyond building the upper gantry.

Solidoodle printers use the H configuration if you're looking to buy instead of build. They're cheap too.

its more of replicator design then h

Isn't the replicator H too? Perhaps I don't understand what a H design is. I thought it was the shape the XY axis bars make. So XY motion for the extruder and Z motion for the bed.

Marlin software has a feature in the start of the Mechanical Settings section called define corexy which allows a single continuous belt being actuated by both motors simutaneously as opposed to one belt and motor for each or the X and Y Axis (hence the figure H). Many commercial large scale CAD plotters use this principle.

Ah I see! That's ingenious. Yes, both the replicator and solidoodle are pushing the X axis motor around when moving in the Y.

I own a solidoodle and love it! if you are looking for a high quality cheap printer this it it.