Should increasing print speed percent also cause a shift of the print forewards or backwards?

[gareee 39]

I've been trying to troubleshoot some issues, and came across this in the last day or so on my U2+ extended.

If I increase print speed say, to 150%, the entire print shifts forward 1/8th of an inch or so. If I slow it back down, it shifts back to where it originally started. This shouldn't be happening, should it? Is there a way to correct this?

I've also been having a possibly related issue of late as well. It seems one of the set screws on one of my pulleys that moves the head front to back keeps coming loose every other day. This shouldn't be happening either, correct?

I haven't come across any other posts about this issue anywhere else.

[yellowshark 153]

150% of what? sort of important! Big difference between 60mm/s and 90 mms/s and not much between 20mm/s and 30mm/s

I have never seen what you describe but I do not print particularly fast.

[ultiarjan 1,223]

correct, you need to tighten the set screws, REALLY tight. If you use the allen wrench that came with the machine it needs to flex.... that hard. I personally use a torx screwdriver on the pully screws as I find the allen wrench to damage the screws to easily....

[gareee 39]

I'll pick up a torx in that size, since it seems it seems they really need a bit more. Does anyone use screw lock liquid to make sure they don't loosen?

If this is that big an issue, I'd think they would be assembled with it in place.

[ultiarjan 1,223]

never use it, in 2 years I only had a loose pully issue once on my UM2

[gareee 39]

Thats why I'm concerned.. I've had to tighten mine probably 10 times in the last 3 weeks.

And speed wise, it was 130% of cura's 50mm speed setting. It doesn't make sense to me that you could even adjust print speed manually, if it caused this effect all the time.

[neotko 1,417]

Did you tight also the motors pulleys?

[gareee 39]

I'm having problems getting to them.. BUT according to my local support, if you use home head in advanced on the printer, and you cannot move the head, then those are tight.

I'm thinking I need to use more torque tightening the front to back pulley set screws. I'm also digging up my screw lock, and will add some of that as well, since this seems to be an ongoing issue for me, and that can't hurt at all.