Y tensioner for 4040 (revised) - for printer similar to ender3v2, ender3max neo (Patreon)

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Download here (shop area)

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No print support

The front of the extrusion must have M5 threaded holes (like ender3v2 and ender3max neo), not sure ender3pro has those tapped, but should be easy

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I had made a version keeping compatibility with ender3v2 stock slider part, but tolerance were a bit loose, so redesigned it from scratch with a new slider

This has decorative "wings" to match the end of the linear rail, but included one without as well

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You will very likely need a longer belt. (about 10~20mm longer than stock, I don't have an exact number to give you, but on ender3v2, about 90mm long, on ender3max Neo, about 120mm should be enough, then you can trim the excess )
I included belt ends, but you can use any other you find
 

M4x20 lengthwise in the slider - socket head (button head won't have enough friction)
If you what a hex head let me know (I need dimensions)
you can use a longer screw but you'll need to use the tensioner_wheel_through_hole version

depending on the bore hole of the GT2 20teeth idler (socket head, but button head should work too)
M4x16 - for 4mm bore
M5x16 - for 5mm bore

M4 heat inserts for the hand wheel, I reused the one from th ender3v2 stock hand wheel.

To secure the outer shell, use the stock M5 screws, or anything greater or equal to M5x12

Install step:

• screw the M4x20 into the slider

• place the idler on the belt

• slide in the slider onto the idler

• secure the idler with appropriate 16mm long crew based on the idler bore size (do not over tighten, the idler should spin without friction, as long as the screw head doesn't stick out, it's good)

• slide the slider in the the tensioner outer shell  

• secure the tensioner outer shell to the Y extrusion

• install a wheel (stock hand wheel from ender3v2 will work otherwise install a heat inserts into the one I provided, I used the one from the stock wheel)