So, I was thinking to myself... what if I used the longest closed-loop GT2 belt that RobotDigg had to offer?

That would be the 1524mm-long 762 Tooth GT2 belt:

http://www.robotdigg.com/product/160/1524mm-long-762-tooth-6mm-wide-2gt-endless-belt


It resulted in a vertical build space of about 650 mm!

I figure I might as well do it this way - the springs are long enough.

I also upgraded the rods to 10mm diameter, with 10mm KFL000 pillow block bearings.


The vertical V-slot supports would need to be cut to about 838 mm long - which is fine since I already have 1000mm-long lengths.

 

Designed an adapter part to mount a 5015S blower fan to the back of the hot end carriage.

The fan gets screwed to the plastic part (the white piece) with 20mm M4 screws, or some other coarse-thread screw that's about 4mm in diameter.

And then the adapter plate just snaps on to the back of the gantry plate with press-fit snap pegs.


I'm still working on an air duct to direct the air from the cooling fan to just under the extruders.

 

Thanks - the pegs printed nicely in ABS, flexible enough to be squeezed without snapping.

Don't have a plate yet to test the fit, but I'm sure it will be fine.

The widest part of the pegs comes out to 5.2 mm.

 

Managed to get a Machinekit / LinuxCNC image running on my BeagleBone Black with the CRAMPS cape...

Even though they have a BBB/Cramps configuration pre-loaded, it will take some work to customize it for CoreXY on the X/Y axis.

Also, I've been contemplating two different methods of homing for the Z axis - with dual motors, it's possible to configure it with two endstops in a gantry configuration, so that each end of the Z gantry homes to two independant switches - a form of auto-leveling, so to speak.

The other method is the Z bed probing with the hot end and piezo sensors, like we discussed earlier.

I'm not entirely sure if it's an and/or scenario - possibly both can be used, maybe.


There's some logic in Machinekit / LinuxCNC for gantry homing, so I'll have to check that out...

 

Sorry, started a new job about a month ago and haven't had time recently.

I will probably catch up with it in a few weeks, and maybe order some parts so I can start building the frame.

 

Resurrecting an old/dead build thread, now that I have both time and money to actually do something about it.

Core XY on top, and 4 x Openbuilds 8mm Lead Screws for the Z axis.

I've found that the Nema 17 motor plate fits perfectly in the middle of the X/Y carriage, so it should work pretty well with one of the new E3D Titan Aero geared extruders - either with a v6 head, or a Volcano..


One aspect I'm trying to stick with this build is NO printed parts in the mechanics - I don't have a functional printer right now, so printing parts is out.