Duender: Belt tensioners from Ender3 v2
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Re-use the belt tensioners instead of creating new ones!
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- GNU General Public License v2.0
Motivation
The Duender belt tensioners are a little fiddly to assemble. The original Ender3 does not include proper belt tensioners, but the V2 does. (And probably later versions as well.) So why not just re-use them instead of creating new ones?
I've made the original design a little more compact to save filament and ease the printing. It also shortens the belt by a couple centimeters. If you need additional space in the front, I've included some scalable standoffs, I didn't use them though.
Which do I need?
One Ender3 v2 contains two belt tensioners (X and Y). They have different bearing sizes, one is 13mm and the other is 16mm. If you have only one v2, print the left side in 13mm and the right side in 16mm or vice versa. If you have two v2, I recommend that you print both sides in 13mm since that version is less asymmetric (this is what I did as well).
Printing
Print with the big flat side down.
Assembly
Use some M5x8 or M5x10 screws to connect the belt tensioners to the extrusions. After inserting the Ender3v2 tensioner into the holder, secure it with an M4 nut or with one of the bed trimming wheels.
The sides matter! I added some small "L" and "R" inside the tensioner to make it clear which one goes where.