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Updates from the 3Drag 3dprinting contest: Roland Hoffert’s Hacks

By on October 18, 2014
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z-wobble solution from www.eytec.de

http://www.thingiverse.com/thing:135151

Roland Hoffert, from www.eytec.de, submitted us this 3Drag (Velleman K8200 version) hack to improve the z-wobble issue, one of the most known problems affecting the RepRap family printers.

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Roland identified one of the weak points that could cause the z-wobble in the fixed coupler of z-stepper motor. With the standard fixing, when the z-stepper moves the z-axis rod it starts shaking and this unwanted movement pushes the z-axis up and down, causing the wobble.

As a solution, Roland replaced the coupler with a flexible one; the elastic support absorbs part of the rotational force and stabilizes the z-axis. In addition, also the top z-axis holder has been replaced with a more stable one, in order to absorb better the vertical vibration. This hack is necessary since the flex coupler is a kind of preloaded spring and it couldn’t keep the weight of the arm and axis itself.

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Here you can find more pictures and the downloadable project.

You can still provide your submission to our 3D Contest!

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