Caution:
Updates:
Rev.1 (3/25 /2024): Minor adjustments to threaded insert holes after some feedback.
Overview:
The linear shaft mod seeks to fix the design oversights of the ender 3’s very finicky y-axis, more specifically the bed wobble that came with the decision to mount the bed on a thin 2040 aluminum extrusion (which were upgraded in the Ender 3 Pro and Pro v2 the 4040 aluminum extrusion) by providing a sturdy linear shaft system to replaces the v-rollers on the narrow 2020 aluminum extrusion. This mod is extremely cost effective and can easily be had for under 50$ or even less if you have you have some of these parts lying around.
The Design Process (for those who care <3):
This mod came about as I received a base Ender 3 from a friend of mine for a very good deal. However, the base ender 3 did have some issues when I used it. The biggest problem being that the V-Rollers on the Y-axis seemed to wear out after a few prints even after adjusting the two eccentric nuts on the bottom.
Being the frugal college student I am, I decided to see if I could remedy this problem with stuff I had lying around I spotted My linear shaft that I gutted from my sermon D1 (terrible printer btw don’t buy it) after doing a certain Y-axis mod from Proper Printing. I harvest the rail and linear bearings and got to work.
It took a few iterations and some time in fusion 360. By which I mean didn’t take into account the extra height from the design of the first sled and the z-axis couldn’t home. Then the heated insert didn’t fit. And of course the 3rd time around I put the wrong inserts in because of course I did. But when everything was done it was looking pretty spiffy.
(The first successful iteration) (The One with the big boi sled that doesn’t fit)
I used this mod for about a month and tossed around the idea of posting it but one issue was the the rods I used were specifically sized at 370mm for the Sermoon D1. I spent 2 minutes in Fusion 360 and adjusted it for you guys.
Materials:
All of these can be sourced from aliexpress for very cheap and many parts you may have lying around already
Note: if you're lucky enough to have a local hardware store the screws can be individually bought for 2$-3$
Printed parts:
Print Settings:
The author marked this model as their own original creation.