Anti-wobble Z-Axis Magnetic Spacer

thingiverse

The original design is great, but it has a couple of mistakes which I decided to correct. 1. It uses only 2 dots (balls) to connect 2 planes. It leads to a situation when nozzle can move along Y-axis like a pendulum. To fix this we need to use 3 balls (according to geometry rules we need 3 dots to build 2 parallel planes). 2. The holes for magnets are exactly 6mm. Almost everyone who has a 3D printer knows that printed holes turns out 0.1 - 0.4mm smaller. In my design all the holes has 0.2 - 0.5mm gap so you can print the detail without messing with settings. 3. I use 5mm (4.7 actually) neodymium balls instead of simple steal balls. It gives stronger connection without affecting the quality. You can still use steal balls from 4.6 to 5mm (4mm ain't fit) 4. I also use 8*3 magnets just cause I don't have different ones :) 5. I advice to put some lubricant in ball grooves. It makes the movement more smooth and prevents the erasure. The spacers along with the ball hack almost removes the wobble in my case. Warning: the TOP and the BOTTOM parts are NOT identical! Useful note to understand the problem: The picture down here is the illustration of the wobble mechanism. As you can see, the stripes on the wall repeats the thread of the screw. Because of the rigid connection between X-axis (or table in case of CoreXY) and screw, and the impossibility to place all parts 100% parallel, we got the situation when movements of Z-axis affects the position of print head.