Double Shear Addon for the SV08 3D Printed Gantry – Stepper Shaft Support with 625ZZ Bearing

This is a Double Shear support addon for our original 3D printed XY gantry for the Sovol SV08. It introduces an upper bearing mount that locks the stepper motor shaft between two points, forming a double shear support setup – perfect for reducing deflection and improving mechanical stability.

If you're using long-shaft stepper motors, this mod helps reduce shaft wobble, vibration, and long-term wear, especially on fast and heavy toolheads.

🛠 What’s New in This Addon:

625ZZ bearing mount for upper shaft support (double shear config)

Reinforced upper AB motor covers to hold the bearing

Backward-compatible: only replaces upper parts of AB motors

🔁 Upgrade Instructions:

If you've already printed the gantry, simply reprint the AB motor upper parts and add the new bearing support bracket.

Use the same print specs as the original gantry, project see below.

📦 BOM – Bill of Materials:

2x 625ZZ bearings
https://amzn.to/43xhWcu
https://s.click.aliexpress.com/e/_oot3Xuo 

6x M3x35mm screws (3 per motor assembly)
https://s.click.aliexpress.com/e/_oD3OvC0
https://amzn.to/4mJpekJ 

2x stepper motors with long shafts (shaft length ≥ 35mm)

📦 Good news for US users:
We partnered with KB3D, a trusted supplier stocking high-quality LDO motors with 35mm shafts, ready to ship!

🌀 Tested with:
✔ LDO 42STH48-2804AH (S55) – AliExpress

Check these out (these are affiliate links — by purchasing through them you also help support our work):

🔗 LDO NEMA 17 42STH48 2504AH S35 – High Temp, Super Power
https://kb-3d.com/store/stepper-motors-servos/2603-ldo-stepper-motor-high-temp-nema-17-42sth48-2504ah-s35-speedy-power-1651971790698.html?affp=30949

🔗 LDO NEMA 14 35STH52 2004AH S35
https://kb-3d.com/store/stepper-motors-servos/4479-ldo-stepper-motor-nema-14-35sth52-2004ah-s35-1723662613552.html?affp=30949

🔗 LDO NEMA 17 42STH48 2804ACS35 Super Power
https://kb-3d.com/store/stepper-motors-servos/1380-ldo-stepper-motor-nema-17-42sth48-2804acs35-super-power-1723665948119.html?affp=30949

🔗 Amazon Option (affiliate) – Confirm shaft length before purchase!

⚠ Other options (not tested):
🔗 AliExpress Option
 

⚠ Print Settings:

Material: PETG, ABS, ASA or better (No PLA)

Supports: Not required

Orientation: All parts are pre-oriented for best results, with the following recommended print settings:

• Material: ABS/ASA we recommend Polymaker
    https://us.polymaker.com?aff=806   ←AFF
• Infill: 30% gyroid
• Perimeters: minim 4 ideal 5
• Top Layers: 5
• Bottom Layers: 5
• Layer Height: 0.2mm

❤ Support Our Work

If you enjoy our content and want to help us keep creating:
🔹 Join as a YouTube Channel Member
🔹 Become a supporter on Printables
 

Every bit of support means more upgrades, more reviews, and more content for the maker community. Thank you!