Solidoodle SD4 ballscrew/nut adapter
thingiverse
The ballscrew and nut combo bought from aliexpress, specifically SFU 1204-3, offers a straightforward installation on the existing aluminum bed. This upgrade was acquired for $19 plus shipping, covering even custom end milling to 8mm diameter. It was well worth the expense :). I purchased this part from store #920371 at aliexpress. A potential drawback of this mod is the reduced maximum print height. When installed, it adds 6mm on top of the bed in comparison to a direct mounting of the ballscrew.
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