Ender Extender 400 Strain Relief for Cable Chain - AC Heated Bed
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This protects the high voltage wires from fatigue and is very sturdy.
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Model information
- Source
- Printables
- Category
- Creality Parts & Upgrades
- License
- Creative Commons — Attribution — Noncommercial
This is a modification for an Ender Extender (400 x 400) with the AC heated bed. The original strain relief included with the kit started to droop / creep after a few months of use, and I did not feel this would adequately protect the high-power wiring going to the bed.
The design is based around the following cable chain, (Befenybay 10mm x 11mm, Outside Open):
https://www.amazon.com/dp/B07QLGWQ1L
However you could modify the native file as needed to accommodate others.
Another point to note is the mounting. The inner-most point goes over the bed leveling spring just like normal. However there is a secondary mounting point, which uses one of the unused holes in the main aluminum bed (see photo with build surface removed).
Not all Ender Extenders have this 2nd set of holes, I believe it was introduced sometime in 2022 or 2023 in support of the “Ultimate Y-Axis Upgrade” also offered by EE. If you are in this situation, you could either omit this second mount location, or drill a hole there and countersink it, so that the bolt head does is flush with the top of the bed.
You will need to use 3x M4 lock nuts at the is second mount location. The 1st one simply retains the M4 screw in position and should contact the bottom of the bed. Then add another lock nut, 1-2 cm higher than the first nut (will need to be adjusted so that this strain relief is horizontal between the 2 mounting locations). The part slips onto this lock nut, suggest using a wide washer first. Then you use a washer and the last locknut to retain the strain relief.
I printed this in CF PETG and it has been fine at 100 C bed temperatures. Check the print orientation in Cura, you may need to rotate it. I used 4 perimeters and 30% infill.