Thanks a lot for sharing! Looks like a good additional idea after aligning everything as good as possible.by cos4 - CoreXY Machines
Interesting idea. The belts just run on the flat outer surface then? Do you see any negative effects compared to using idlers with teeth (where applicable)? I received shoulder screws and 3mm steel rods. Unfortunately my Powge idlers have something around 2.95mm inner diameter. Using standard bearings would be nice since they are available with documented tolerance classes to get a real proper fby cos4 - CoreXY Machines
Quotethe_digital_dentist The pulleys have two bearings each so should not "tilt" as they turn. If they are tilting, it is likely that the shaft is too small in diameter. You should probably use either a 3mm steel rod, cut to length, or get shoulder screws that have 3mm diameter shoulder. You will find they fit tightly in the pulleys and do not allow them to tilt. Thank you for the feedback. I orby cos4 - CoreXY Machines
I built a self-designed core-xy printer inspired by the Hypercube. The prints come out fine but when I move the extruder I get a rattling sound from the pulleys, mostly from the idlers in the back. For the pulley mounting I used m3 washers which I sanded down to the diameter of the inner bearing ring of the pulleys. I put these on the above and below each pulley on the screw providing equal distby cos4 - CoreXY Machines
Thank you very much for the detailed answer. I'm using a direct drive E3D Hemera, so the extruder carriage will be relatively heavy. As for the acceleration/jerk values I need to have a look what is the maximum that makes sense taking the limitations of the extrusion process for a good print quality into consideration. I plan to calculate the resulting forces then before choosing the actual dimenby cos4 - Mechanics
I'm planning to build a printer in with CoreXY kinematics based on the Hypercube evolution design. For the X and Y axis I want to use MGN linear rails. In the installation manuals it seems that these rails are meant to be always mounted on a stiff, flat surface. However I see quite some designs using an unsupported rail as X axis (e.g. here: ). Since I'm planning for a relatively small build voluby cos4 - Mechanics