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I designed these parts to mount linear guide rails on the Y axis of my Elegoo Neptune 3. This kit could be used for any 235x235 machine with 4040 Y axis extrusion.

The linear rail adapter is universal left and right, which is why it's shaped the way it is. You need 2 adapters and 2 jigs. The jigs use the same M3 x 8mm screws and T nuts as the rails, so everything can be done with basically one screw size. You need 4 M5x16mm long screws to mount the adapters to the bottom of the table. Leave them loose until you secure the adapters to the linear trucks with the M3 x 8mm screws so the adapters are mounted securely to the trucks, then adjust and tighten the 4 M5 lock nuts to secure the table. The jigs are used on the underside of the 4040 extrusion to align and center the rails.

Youtube - https://www.youtube.com/watch?v=5DlCFSf0o3Y&t=69s

Here are the parts used:
(2) adapters
(2) jigs
m3x.5x8mm socket head cap srews - https://amzn.to/3SBXM8U
m5x.8x16mm button head cap screws - https://amzn.to/3LIxSxT
(2) 12mm x 300mm linear rails - https://amzn.to/3SjD6CI
m3 drop in T nuts - https://amzn.to/3SBewwY

Please note
This kit took a long time to design, test, revise and implement, so if you wouldn't mind, drop me a tip! :)

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