Wobble ring bolt on upgrade for Rat Rig V-Core 3

Wobble rings are a version of a Oldham coupler...but because they use ball bearings rather than sliding surfaces they are very low friction and can work slightly better on light industrial machinery like printers.

The key disadvantage of wobble rings is the complexity of the design. The simplest solutions usually work better and make youir printer much easier to work on and service. Wobble rings work very well,  but are a complex solution to a simple problem. 

A much simpler, and equally low friction solution are VenterMech de-couplers. I developed the VenterMechs after developing this version of wobble rings for the  Rat Rig V-Core 3 printers and have now been using them for several years on my printers.

For more info VenterMech de-couplers click here: https://bit.ly/VenterMech.

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If decide to make a donation to my coffee fund (which keeps me up late at night doing more of this stuff) I would appreciate it. There is absolutely no obligation for you to do this. My PayPal account is [email protected]

Please remember to post feed back as it is always valuable to me for future iterations.

Many thanks.
Liam Venter
MFBS Design

This version does not cost you any Z height capacity.

These arms and the integrated wobble rings are just a bolt on upgrade. the top ring is integrated into the bed arm which simplifies the design over other wobble ring inmplementations. No other modifications are required to use these.

They are compatible with my rear leadscrew guides. https://www.printables.com/model/595289-gold-series-leadscrew-guides-for-use-with-venterme

I don't claim this is an original solution. I have built upon pioneering work done by others including MirageC, Spiro Argyros and r0bb10IT.

• The top wobble ring is integrated into the arms. (reduces part count and complexity.)
• I have included a file for lead screw nut should you wish to try print one rather than purchase one. PETG is a great material choice for the lead screw nuts and has proved very long lasting.
• Each bearing ball is located by two magnets, one above and one below each ball bearing. Having a bearing on each side of the ball bearing helps keep the bearing centered. It also provides a stronger magnetic force to keep the assembly clamped together. These will help stop you loosing the bearing balls while working on the printer. The magnets in each pair should be orientated to attract each other.

Twenty four: 6 mm x 3 mm neodymium magnets. Available from Aliexpress.

Forty eight: 10mm long 3 mm diameter steel pins. You preferably want these to be magnetic. Look for GCr15 Bearing steel roller 3mm pins

Twelve: 4mm bearing balls (Specify that you want them magnetic. Do not get stainless steel ones). Available from any bearing supply shop for about 10 cents each.

Three: TR8 x 4 lead screw nuts. These are available from Aliexpress. I have also included a file for the bottom wobble ring that you can insert one of the lead screw nuts into.

Twelve: 3mm x 8mm counter sunk screws (to fasten the lead screw nuts into the bottom wobble ring.

Twelve: 3 mm x 5 mm heat inserts.

You will need to print.

1 x left arm

1 x right arm

1 x rear arm

3 x wobble rings

3 x bottom wobble rings non integrated.

Print Settings

Printer:

Rat Rig V-Core 3

Rafts: 

No

Supports:

No

Resolution: 

200

Infill:

30% Gyroid

Filament:

Any PETG, ABS 

Any

Category: 3D Printer Parts