This bracket is intended to be a printable replacement for the laser-cut brackets used for the threaded z-axis rods.

The side-mount bolts pass through captive nuts to lock the bearing (608-style skate bearing) in place, removing the need for precisely aligning the nuts holding the bearing in vertical position on the threaded z-axis rods. It also may allow for easier removal of the z-axis rods themselves when combined with the revised U-shaped z-platform Small Makerbot Parts (thing:926).

Note 1: My test ABS print is quite tight around the bearing so the inner radius may need to be increased by 0.1mm or so.

Note 2: The 20090928 variant increases the inner radius surrounding the bearing by 0.5mm. A 1mm ring has been added to the top to strengthen the tear-drop, side-mount bolt holes.

Note 3: Download the LaserCut variant if all you have is a laser cutter.

Parts of the Cupcake design were used to design this part so License is inherited GNU GPL.

3D Printing Instructions:

1. Download the STL.

• For a snug bearing fit, download the 20090927 variant
• For a looser bearing fit to allow for more side-mount bolt positioning room, download the 20090928 variant.

2. Raft with your favorite skeinforge settings

3. Print.

4. Clean up the print.

• Pass M3 bolts through all the holes to clear out any strands.
• Push a bearing through to ensure a clean fit.

5. Insert at least two captive nuts with M3 bolts at right angles in the side-mount holes.

• To try: Use M3 set screws, 6mm to 8mm in length (e.g. McMaster Part 91390A100)

6. Mount the bracket on the Cupcake Top.

7. Adjust the threaded z-axis bearing height to sit at the side-mount hole positions.

8. Tighten the side-mount bolts.