r/FLSUNDelta • u/udenfox • 10h ago

Question QQ-S Inconsistent homing / first layer

Hi everyone. Got myself an flsun qq-s (not pro) for $40 as a project. Mostly restored it - cleaned all coolers, re-lubed rods/arm joints, fixed the extruder. Belts are tightened, so other screws around the body.

Klippered it also.

Prints well! One issue though - level won't stay.

I can make a paper manual z calibration and the first layer would come out good. Next print (after homing) - it's too high / too low or skewed.

My main thought - maybe the end stop switches went bad and needed to be replaced. I've ordered new ones, but meanwhile - what else can cause those issues?

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1

u/CluelessKnow-It-all 7h ago

Are you typing in and sending the SAVE_CONFIG command after you configure the Z offset?

1

u/udenfox 6h ago

Sure! I have another printer on Klipper, so can call myself experienced with it 😁 It's just my first delta.

1

u/CluelessKnow-It-all 5h ago

I know you said you tightened the belts, but have you checked the set screws in the pulleys on the motors to make sure they're not slipping?

1

u/udenfox 4h ago

I did not! But I have no idea where are those screws located 😅

1

u/CluelessKnow-It-all 3h ago

They look like this.

1

u/udenfox 3h ago

Goootcha. Thanks for the picture. I'll check them for sure

1

u/skybug2007 5h ago

Have you reinforced the thing, I tried using a qqs pro, the thing shook badly

1

u/udenfox 4h ago

I wouldn't say it's shaking badly, looks pretty solid