Printerbot simple metal Y upgrate
thingiverse
Y-change for Simple metal its an adapter for https://www.thingiverse.com/thing:2023947 using this setup with a bowden will dramatically reduce the weight of the extruder (as seen of photos). I also recommend moving the Y end stop to the back so you don't lose any Y length and i think that the Z upgrade (https://www.thingiverse.com/thing:2011148) is a god one as well and i use this for the bowden extruder (https://www.thingiverse.com/thing:927428). For my adapter you need 10xM3 25mm screws and 8xM3 nuts.
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