Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
Threaded on the rear trapezoidal nut, and it doesn't match pic 2 in step 4.30: there's not enough room for the nut's "protruding section" to fully seat and get the nut flange flush. Picture 2 of step 4.30 appears to show the nut flush with the heatbed carriage, which ain't happening in my case; picture attached.
Wondering if this is normal/correct, or if I should be backing up and figuring out where I went wrong.
Best Answer by vjarnot:
It helps if you place the bed spacer right-side-up, apologies for the trash thread.
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
It helps if you place the bed spacer right-side-up, apologies for the trash thread.
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
I guarantee that someone else is going to find this thread answers their question.
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
I’m also stuck at the step where I have to screw the nuts onto the trapezoidal lead screws.
One of the three nuts runs smoothly, while the other two are very stiff. The smooth-running nut works easily on all lead screws, whereas the stiff ones run hard on all lead screws.
So the problem can clearly be attributed to the nuts.
Does anyone know a trick to make them run smoothly?
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
Check the tight ones for burrs, but I think you need to contact Prusa. I can't imagine a good way to loosen them up as you don't want to embed anything abrasive in them, nor is multi-start tap anything available or affordable. The printer will not work right with tight nuts!
RE:
Thanks, that’s what I was afraid of. I’ll do that.
I’ll report back on how it turns out.
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
I’m also stuck at the step where I have to screw the nuts onto the trapezoidal lead screws.
One of the three nuts runs smoothly, while the other two are very stiff. The smooth-running nut works easily on all lead screws, whereas the stiff ones run hard on all lead screws.
So the problem can clearly be attributed to the nuts.
Does anyone know a trick to make them run smoothly?
A handful of users have reported nuts that were not threaded properly, all somewhat recently (last month or two?). And when I contacted Prusa with a different lead-screw issue, they initially were quite biased to assume that one of the nuts must be bad. It seems likely that they have used a bad batch of parts with quite a few outliers recently.
If you contact Prusa support, they will probably send you replacement nuts without much debate. They sent me three extras with my replacement leadscrews, just for good measure.
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
Following the live chat just now, I will now receive a new set of lead screws.
RE: Assembly step 4.30: rear trapezoidal nut - is it supposed to sit flush with the heatbed?
Now I received the nuts yesterday. Only a 2-day shipment from Prague (Czech Republic) to Dresden (Germany).
The new nuts are fine.