Printed enough of the current-iteration corner braces for two sides (and another two braces printing). Printed a fit-check for a motor mount.
My aim is to have the belts centered on the same plane as the (upper) extrusions. (As far as possible, no torsional or off-center loads.) Structurally, the motors are “hanging” from the frame corners.
Clearly there is torsional load from the belt on the motor (normal to the plane of the belt path). Yes, this is bothering me.
Tempted to run the belts more outside the frame, to as far as possible preserve the potential print volume. Even if I lose a few centimeters off the 500mm cube, that is still a decent volume. Simpler to “hang” the belts inside the frame.
(Not to mention as yet I have no idea where to get a 500mm square heated print bed - or slightly smaller. A problem for later.)
I expect to merge the corner cube, diagonal brace, and motor mount into a single print - before done.
With just two sides of the cube braced, the cube has gone from floppy to stiff (except in the un-braced dimension). Yes, this with ridiculous light/fast prints for the corners and braces.
The test will come when I measure frame deflection with motors at full torque.
Iterating…
