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OpenBuilds - H-Bot based 3D Printer

by swe3tdave, published

OpenBuilds - H-Bot based 3D Printer by swe3tdave Sep 20, 2013
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In this build i am using a WTF2040-2 Ball Bearing Nut with associated linear screws and FF15, FK15. I got them cheap on ebay, that's the only reason i'm using them here. Its probably a good idea to modify the design for acme screws, that way you can replace the 80 tooth pulley with something smaller. I needed a 4:1 ratio to slow things down, the screws are just too fast. You wont have this problem with acme screws.

For the rest of the build, its gonna require drilling about 4 holes on the openrail gantry plates. i still have to figure out how to attach the timing belt to the print head and i'm probably going to have to modify the jhead mount.

The rest of the mount can be found here: http://www.thingiverse.com/thing:108273

The rest of the parts are from OpenBuilds: http://openbuilds.com/

You can see the H-bot, movement here: http://youtu.be/ei4lPk_aM9Y

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hi, what are the dimensions of the build plate? And can u post some link for the belt you use? It looks nice, more like tape

Look at the bottom for the link to the model, the belt i used is there, i just copied and resized(streched) to the size i needed. http://openbuildspartstore.com/smooth-idler-pulley-kit/http://openbuildspartstore.com...

The build platform could be resized to 565mm X 385mm. There is a V-slot extrusion in the way of the Gantry, removing that would provide more space for the platform but i dont think its a good idea. The Z axis has 310mm of freedom. That said, the V-Slot and OpenRail system is versatile enough, and with available lenght of 1500mm, you could build this thing to be pretty large. Screws that would fit the THK WTF-2040-2 Nuts i use are available to lenght of up to 2060mm.

The gantry plate can be found here: http://openbuildspartstore.com/openrail-gantry-plate-universal-mount/http://openbuildspartstore.com...

This is an H-bot; which is not the same as CoreXY.

i originally saw this on the Buccaneer from Pirate3d and they where refering to it as a CoreXY movement. Thank You for correcting me.

It uses the same kinematics, but the CoreXY belt design eliminates the "racking" that is typically seen in H-bot designs. It's likely you'll experience this at some point and may end up redesigning the gantry to be horizontal instead of vertical to accommodate for it.

This is very similar to a design I've had in my head for quite a long time now... I've been thinking about it for over a year but still haven't committed to paper, let alone started building anything.
Anthony, can you tell me what you man by "racking"? I really like the H-Bot gantry design and it's basically the same as CoreXY, but so much cleaner without the crossed belts... I don't like the idea of the belts crossing eachother in CoreXY.


From what i can tell, that "H" is gonna have a mind of its own, the 90 degree angle of the Y axis is gonna move a few degree up and down as the Axis move. With that said, i tried both design, with a piece of cord, a ruler and a few improvised pulleys... i did see the problem with both setup. It was less of a problem with coreXY, but it was still there. I think both design require good pulleys, as smooth as possible, and the belt must be as tight as it can be without obstructing movement. i wonder if it would be better with 4 motors...