Bed Offset

[CarlGregg 1]

Hi,

 

Like most Universities, we have pooled our 3D printing resources and are producing PPE items. One of the Ulimakers that has come from a different department and it is behaving a little oddly. We are printing a shield design that needs the full bed of the Ultimaker and one one printer, it prints about 15mm forward in the Y-direction. This results in part of the design being flattened (at the extremity of the part) which is not a huge problem but occasionally we are seeing a layer shift. Amongst the printers, we are running 2 UM2+ and 3 UM2ex machines and they are all sharing the same G-Code. The rest of the printers produce identical prints that are correctly centred on the plate. I have performed a factory reset on the machine and there is no visible difference between the printers.

 

I have attached an image of the model printing in the correct and incorrect positions. Any idea what could cause this?

 

Yours,

 

Carl

[gr5 2,167]

You have less Y travel on that machine.

 

There is an end-stop switch for the Y direction.  Push the head towards the rear of the printer until you hear the switch click.  It should happen when the rod hits the switch (sometimes you have the opposite problem where the rod has slid through the sliding blocks and doesn't hit it at all).

 

Anyway you want that click that you hear to occur another mm or so farther back.

 

You can try bending the metal part of the switch but you might break it.  You can also loosen the 2 screws on the left side of the printer that hold the switch, then slide the switch towards the rear of the printer and retighten.  Go easy when retightening - there are no nuts - the threads are self-tapping in the plastic switch housing and it's easy to strip them so go a little easy on the tightening.

 

Whatever you do, make sure when you push the head to the back of the printer, you still hear the click before the head stops moving.

[CarlGregg 1]

cheers, I will give it a go.

 

Carl

[CarlGregg 1]

Sorted, thanks. There was no slack to move the microswitch when the screws were loosened. Ended up carefully bending switch bar.

 

Thanks,

 

Carl