voron2.4 3D printer xy joints mod for M4 screws
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voron 2.4 3D printer, x y joint left and right parts, modified to use M4 screws instead of the original M5
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- GNU General Public License v3.0
This is part2 of voron 2.4 M4 screw mod.
In voron 2.4 original design, M5 screw is used as standard, however I believe M4 screw is strong enough. So using M4 for the xy joint parts.
original part name is
\Voron-2\STLs\Gantry\X_Axis\XY_Joints\
xy_joint_left_lower_MGN12.stl
xy_joint_left_upper_MGN12.stl
xy_joint_right_lower_MGN12.stl
xy_joint_right_upper_MGN12.stl
( This is Part 1 for Z tensioner bracket M4 mod.
https://www.printables.com/model/517636-voron-24-z-tensioner-bracket-use-m4-screw
)
The benefit of using M4 screw in my opinion is:
1 slightly lighter M4<M5 screw weight, I roughly measure it could reduce about 26g (for both left and right xy joints)
2 smaller holes in plastic (printed) parts, so part should be stronger.
3 Lot cheaper purchase cost for M4<M5 screw, I found that M5 screw is a lot more expensive than M4, maybe part of the reason is shipping cost for the heavier weight.
The change of design list:
1. bearing F695 changed to F604
In original Voron2.4 design it uses F695 bearing (hole = M5, body for belt diameter is 13mm, thickness 3mm for belt), unfortunately there is no such equivalent M4 hole bearing.
the closest one is F604ZZ, hole=M4, thickness same but body for belt diameter is 12mm.
F624ZZ cannot use since it's thickness is too large , even though it's body diameter is 13, same as F695.
So I chose F604ZZ, but in order to let the different diamter 12mm fits, must move the bearing hole to outside of the part by 0.5mm (x and y directions), then it shall fit as the original.
2. M5 teeth idler (20T) changed to use M4 teeth idler (20T). left and right.
3. 4X M5 40mm socket head screw, changed to use 4XM4 40mm socket head screws. left and right.
4. 1XM5 button head 30mm screw ( on the bottom of the xy joint) changed to M4 socket head 25mm (smaller and shorter). left and right.
5. 3X M5 hex nuts changed to 3XM4 hex nuts. left and right.
6. 2XM5 10mm button head screws (left upper on 2020 extrusion), changed to 2XM4 10MM.
7. 2XM5 16mm button head screw (right upper, on 202 extrusion), changed to 2XM4 16mm.
optional:
1 I recommend use nylon washer 1mm thick for bearing upper and lower to replace the M5 metal washer
also nylong 0.5mm for 20T idler upper and lower.
2 for hex nut and screw to hold bearing or idler, they cannot be tighten (otherwise will damage the bearing or idler), I recommend using nylon lock nut instead of regular hex nut , so the screw won't get loose easily.
Print material ABS, 40%, 4 wall as voron recommended.