Gudo Xy Core - By Charles Guy Doppia & Neotko

Last crawled date: 4 years, 2 months ago

First of all, this MOD uses ZGE as extruder but has parts that have been rebuild for this big mod that changes UMO/UMO+/UM2 gantry to CoreXY
It uses Bondtech as drivergears, Duet3D as mainboard and, to print I use TheOlssonRuby nozzles, just because for me they are the freaking best.
https://www.thingiverse.com/thing:2348263
All is ZIPPED for your maker enjoyment on one file, with step files, stl, etc.
General
Gudo and I made this, specially him but I pushed him over a year to reuse the umo/um2 frame into a CoreXY machine, since we both had many issues on UM2 gantry style to print fast, without vibrations and as fast as possible since we modded the machine into ZGE (small added weight on DD clearly shows how weak the XY gantry um2 style printers are and how limited the max speeds become)
So this mod is unfinished, but also finished, Gudo did pass away in the summer of 2018 and it took me quite some time to get strength and post all. Not just because work, but because it was a really sad thing to do, to post this without him.
But Gudo always wanted to share, create, improve and make better machines than what we have. This is an advanced mod, it requieres you to open step files, check stuff, and thing. You will need to align the parts so they print right, file MANY parts, to adjust them, insert tons of screws, get boxes of short/medium/long screws and check again and again where all goes. Thing of if as the most complex (and in the end you will see isn't that hard at all) diy-rebuild-printer.
How much stays and how much it goes from a UM2?
You keep the bed, hotend, frame, stepper motors and some pulleys and bearings. The controller board goes away, the belts, lots of smooth rods, all that goes away (except one that can be reused for the X, but I never did that, nilrog ( https://twitter.com/nilrog ) on twitter has that version from Gudo for his UM2GO-gudoXycore version. Will upload his zip for added mod fun if you are into this.
All the gantry installation is made by hand, I did design very easy corner guides for umo+ frame that help to make drills, they are very easy to make, just get the Step file with all assembled Gudo made, and do some booleans of the holes and make a printable guide, check mine for reference of what I mean. This will help you drill the holes for the hiwin/misumi rails.
To align the rails you just need to semi screw two top-bottom rails, not tight, and then adjust the distance relative to each side panel, use a fixed distance and align the rail, when is straight tight one, adjust the length and tight the other. If you did drill this correctly (remember to leave gap for screw movement so you can align all) the rest comes easily.
After setting both Y rails, when the X rails comes in, you can align the X using the panel as helper and the hotend. Push in front, check its perfectly align and tight the Y rail holders to the rains, side by side, slow and with patience.
Charles Guy Doppia, Gudo for me, made a Xy Core info that someone published onhttps://www.gecko3dprinter.com/2-assembly/5-xy-belts/
Mind that this is for the 3D Gecko, the machine we did toy with for quite sometime. Gudo tips will give you a bit of insight about what's important to keep an eye on the gudoXyCore.
More questions!??
For help and questions DONT PM me, please use public twitter post so keep info and answers public to everyonehttps://twitter.com/neotko/status/1215257844368453632
Video references that can be useful
Wiring and 5V fan cable on Duet3D 2.xhttps://www.youtube.com/watch?v=VNkVqTN0v_Y
How to change pins order on molex cables (if you need to switch motor directions can be usefull)https://www.youtube.com/watch?v=aXLPB5e71Ng
Small mod to plug PT100 cables on the Duet3D not exactly needed the 'solder' part, but usefull anyhowhttps://www.youtube.com/watch?v=GJCLiqsz_ho
How to CRIMP cables - Check minute 7+https://www.youtube.com/watch?v=tRU7LPtAVGw
FILES
Check the 'NEOTKO EXTRAS' folder
I made a Y rail holder that uses 1cm Square Aluminium bar as reinforcement, it does work great on 3 machines, but you will need to make a lot of drills and manual labour. If you want it easy, buy 2 rails for X, ofc it's more money, but....
Also check the CONFIG.G text file, it will help you setup the Duet3D faster, but not automagic, you need to read before using it.
BOM
Option A) Hiwin rails MGN9H for X x1 254mm / and 2x 275mm qty 3 ( or 275 and you cut them the wanted length)
Option B) MISUMI RAILS for Y x2 SELBV10-275-MC for X x1 SELBV10-254-MC
Note if you use MISUMI for the Y you need to adjust the front corners since their heigh is smaller, easy to boolean before printing
Bearings
F604ZZ 4x12x4 qty 18
625ZZ 5x16x5 qty 4 -
6800ZZ 10x19x5 qty 2 <- FOR zge motor holder
Motor Flex coupler
5mm x 5mm qty 2
Geared Bondtech motor qty 1
GT2 belt
You need at least 3m of GT2 6mm belts get good quality ones
Reusing UM GT2 20T pulleys
5mm motor pulley qty 2 (XY motor)
8mm pulley qty 1 (Z geared motor)
5mmx40mm motor pulley shaft qty 2 ( hobby car driving shaft could be used )
4mmx30mm Xrail bearing shaft qty 2 ( M4 x30mm set screws could be used)
Fasteners
M3 bolts and nuts :
6mm chc qty 8 (Yrail slider bloc)
8mm countersunk head qty 4 (Xrail slider bloc)
8mm chc qty 10
10mm chc qty 10
12mm chc qty 30
16mm chc qty 30
18mm chc qty 10
25mm chc qty 10
30mm chc qty 20
35mm chc qty 20
45mm chc qty 2 (XY pivot motor holder)
hex M3 nuts qty 100
square nuts qty 100
M4 bolts
30mm qty 10
35mm qty 10
square M4 nuts qty 10
IMPORTANT NOTE ABOUT BOM
Some screw numbers are APROX, Gudo never did the final BOM, but it's accurate. You might end having a few extras
Thanks to
Thanks to Duet3D for making a modern printer controler that can be adjusted easy and FAST without firmware rebuilding or boring stuff. Thanks to Bondtech for making such a highquality drivegears (just my oppinion, they never sent even a discount) and SPECIAL thanks to The Olsson Ruby, just just an amazing nozzle, but also Eric, Anders Olsson and all that cool guys that keep pushing the boundaries.
Also, special thanks to Foehnsturm. I did put Gudo and Him in contact years ago and they talked about how to improve and make the XY motors belt tensioning system, one of the key parts for this CoreXY to work as nciely as it does. If you don't know Foehnsturm, he's the guy that came with the Mark2 Tool changer and one of the most brilliant guys I know.