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Prusa-Belt 624 X-Carriage for Mendel

by 4ndy Nov 30, 2011
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I just upgraded my standard mendel X carriage to the open-x carriage and am very impressed with it - you should consider that as an option.

Yeah I saw it ages ago, though I'm not sure about buback's method of clamping the belt with printed teeth, that's the main sticking point for me, having had trouble with backlash whenever the belt got slack before.

Besides that, I like the original x-carriage design for its robustness, heavier as it may be, I'd rather have overkill for the best accuracy that I can get than be minimalistic when I already have a printer running. I'm not exactly sure about that single dangling bearing either, and this way I can mount an extruder in whichever direction suits. :)

I figured you'd add your prusa belt attachment method to the open-x carriage rather use the open-x directly. (I agree, I'm not fond of the current open-x belt attachment either.)

The single dangling bearing is fine, in fact it could probably be removed altogether - gravity plus extruder weight holds the carriage down fine (although maybe if your filament spool was high friction and causing pulling up on that side of the carriage it could be a problem).

The regular mendel
carriage really sucks for accessibility, whenever I wanted to remove my extruder I found myself cursing trying to poke at nuts past the rods on the inside.

Odd that, I think it depends on print quality, but the captive nuts for mounting an extruder always stayed in place under the carriage for me, and I could easily remove an extruder in seconds by releasing two bolts on top with an M4 allen key.

Also, I just had a bad experience with the theory of gravity holding a carriage down on this; the PLA bushings on my temporary carriage softened up with the heat of printing ABS, and due to not perfectly calibrating my extruder when I changed it, a little too much plastic was coming out and pushin
g the nozzle up, or otherwise dragging it through in places, on full layers. I ended up holding the carriage down for most of the print, just so that I could get parts to the standard pictured above; practical in the end, yet fugly as hell.
Hoping there won't be a significant force pushing the carri
age up off the rails? Never again.