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prusa i3 printing exactly 20% smaller than sliced

otter5555

prusa i3 printing exactly 20% smaller than sliced
October 18, 2015 08:33PM

Registered: 10 years ago
Posts: 14

i've built a ton of printers

i run a large bank for a living and have done so for many years

thought i'd seen every problem you could see with a 3d printer......nope smiling smiley

just finished a new aurora i3 (my current favorites)

no matter what you slice every print turns out 20% smaller on the x and y than sliced

the z prints exactly as sliced, perfect

anybody got any ideas?

thanks in advance

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Qdeathstar

Re: prusa i3 printing exactly 20% smaller than sliced
October 18, 2015 08:46PM

Registered: 9 years ago
Posts: 338

not an expert but the first thing I would suspect is that the steps per mm is set up wrong or maybe one of the jumpers for the micro steps is loose.

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gmckee

Re: prusa i3 printing exactly 20% smaller than sliced
October 18, 2015 10:58PM

Registered: 9 years ago
Posts: 182

I agree with Qdeathstar. Confirm steps per mm with the Prusa Calculator.

Prusa i3 Rework - Ramps 1.4 - E3d Lite6 - Full Graphic LCD Controller

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o_lampe

Re: prusa i3 printing exactly 20% smaller than sliced
October 19, 2015 04:18AM

Registered: 9 years ago
Posts: 5,232

Number of teeth on the GT2 pulleys is 16 instead of 20. That's exactly 20% difference.
-Olaf

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otter5555

Re: prusa i3 printing exactly 20% smaller than sliced
October 20, 2015 05:07PM

Registered: 10 years ago
Posts: 14

it was the pulleys

i didnt think i even had any 16 t pulleys smiling smiley