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Complete TronXY X5S CoreXY Y-Gantry Set
Linear rail (MGN12) on 2020 profile conversion with stacked belt idlers3D printer parts and enhancements
A permissive Free Software license that lets this work be widely shared with few restrictions.
Deprecated, upgraded to Hemera and overhauled gantry there:
=> https://libre3d.com/category/708/CoreXY/listings/1307/TronXY-X5S-CoreXY-MGN12-linear-rail-on-2020-profile-conversion-with-E3D-Hemera.html <=
Documentation of build at: https://burningbecks.wordpress.com/2018/12/25/new-y-gantry-stacking-the-pulleys-again/
This OpenSCAD file generates parts for the linear rail conversion of a TronXY X5S (or potentially any other CoreXY printer made from 2020 aluminium extrusion).
The pre-compiled STLs are meant for another 450mm long rail on the X axis (the .scad can generate a variant for 400mm rails) and threaded sleeves as idler axles.
If you can't find threaded sockets / sleeves with outer diameter 5mm, length 30mm and M4 inner thread you can still fall back to M5 screws - just compile it accordingly with OpenSCAD version 2015.03-2.
The "ABS_support" parameter and the ...ABS.STL are meant for tricky materials like PC-ABS (Lilypads and extra support are designed in).
Remove or exchange logos according to your gusto.
If you don't have "GT2-20T-6-5B" (GT2 pulleys with 20 teeth, 5mm bore for 6mm wide belts), change parameters to yours, but watch for alignment with motor and corner pulley mount! (Suggested read before designing yourself: https://drmrehorst.blogspot.com/2018/08/corexy-mechanism-layout-and-belt.html - I know my carriage is off! It's up next. ;-) )
EDIT 2 - Just uploaded some more rugged motor mounts: https://www.youmagine.com/designs/reinforced-motor-mounts-with-bushing-for-shaft
Materials and methods
I'm expecting you to have a rail alignment piece at hand - if not you can find one e.g. as "rail_too.stl" at https://www.thingiverse.com/thing:3247870/files or at https://www.thingiverse.com/thing:2804412
You will also need one " Tronxy x5s reinforced left motor mount by xxdanmurphyxx" from https://www.thingiverse.com/thing:3200434 - AND ONE OF THE MOUNTS NEEDS TO BE PRINTED MIRRORED!
Besides threaded sleeves, idlers (eight with teeth, two without), a belt that is still long enough and the usual mounting material (M4 screws and T-nuts for the 2020 extrusion) you will need M3x16 screws and nuts to mount the idler plate to the gantry plate (also M3x20 if you want to add the X-profile-brace) and for each axle an M4x16 and an M4x20 screw. (Cylinder- or pan head prefereably.)
Issues are used to track todos, bugs or requests. To get started, you could create an issue.
You're right, Mark.
The text already said "I know my carriage is off! It's up next. ;-)", but I was too lazy to exchange the photos of my old carriage.
The fitting carriage is https://www.youmagine.com/designs/tronxy-x5s-x-carriage-for-mgn12-linear-rail
In looking at the photos of the printer I noticed that the belt connections to the extruder carriage do not keep the belts parallel to the X axis guide rail. That is going to lead to variable belt tension depending on extruder carriage location and distorted prints. See: https://drmrehorst.blogspot.com/2018/08/corexy-mechanism-layout-and-belt.html