@Whosa_whatsis I’m finally printing off a Wallace and want to know how well the stock z couplers work?
They work great when used with nyloc nuts on the ends of the Z screws, as long as the bearing resistance is low and the machine stays more-or-less upright (they rely heavily on gravity, and the X axis isn’t terribly heavy). In addition to working as flexible couplers, the Z screws are designed to separate both from their couplings and from the X ends in the case of a head collision (this actually means that the Z screws can be removed completely without disassembling anything). This belt-and-suspenders approach was really unnecessary, and if I was building another one today I would just use tube couplers instead.
That is some excellent engineering if I might say so, I had my Prusa almost destroy itself when the z endstop failed.
Do you think that the top brace (that joins the two z rods) is necessary with a print height under 100 mm, or is the necessity of it more or less print speed related?
I wouldn’t recommend building without it. If you’re configured for 8mm rods and printing under 100mm tall and moving slow, you can probably get away with it, but personally I wouldn’t. They help keep the whole frame square.
Alright, I’ll definitely use them, I have no clue what speed the guy I’m making it for will be printing at, so better safe than sorry.
Thank you for your help!