Jooch, your post is unclear about whether you wish to buy or build a CoreXY printer. If you wish to buy, I don't know of any CoreXY for sale that are suitable for low maintenance operation. QuoteWhat feature would you guys mark as essential for a reliable core XY machine? To start with, you need the features are required for any reliable 3D printer: decent hotend, decent electronics and powerby MartinJB - CoreXY Machines
I did originally have provision in my design for X-axis support, but have found it unnecessary. X-axis flex is low because: 1. Torsion about the X axis is low because of the close pulley spacing on the Y-carriages 2. The forces on the X axis generated by the CoreXY system are generally in directions that don't flex the X-axis (apart from the torsion mentioned above) 3. MGN rails are hardened steby MartinJB - General
A 400 x 400 bed is very large. Unless you really need that size, I'd consider a smaller printer. A smaller bed heats up more quickly, and all other things being equal a smaller printer will be more rigid. I have 3 printers in regular use, the smallest has a build volume of 90 x 80 x 60mm and I print most of my stuff on that. If you really need the size, then I would consider doing the minimum upby MartinJB - CoreXY Machines
Thoughts on your rebuild 1. I wouldn't use wheels on 2020 extrusion. Although OK at first, they wear a lot quicker than linear bearings. They also take up a lot of space so require compromises in the frame design. 2. Depending on how much you want to redesign/upgrade I'd consider using linear rails rather than linear rods for the CoreXY mechanism. The print quality from well-adjusted linear rodsby MartinJB - CoreXY Machines
If you are building a CoreXY, you might want to consider the MaybeCube. It's a linear rails design that supports a high level of customisation. It's also fully enclosable. I took a lot of steps to keep the costs down (for example using standard extrusion lengths, so no custom cutting required, hidden joints are used as they are the most rigid (and self-align) and also keep the fastener count downby MartinJB - General