The Original Prusa i3 MK3 is the successor of the award-winning Original Prusa i3 MK2 3D printer.

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Mk3 X-axis belt length

Hi folks,

I’ve just received my Mk3 and am proceeding through the build manual. My query is around the length of the X-Axis GT2 belt for the Mk3 as mine will not reach the X carriage again, even with minimum overlap at the start and correct routing. The belt that was in the Z-Axis hardware package for this purpose is 795mm long.

My Y-Axis belt appears correct length. All assistance appreciated.



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Hi Scott,

belts for MK3 should be the same length as for MK2, therefore:

Y-axis: 650 mm

X-axis: 850 mm

I'm sorry yours is only 795 mm, which isn't enough. Please contact our support team ( and we will send you replacement.

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Scott will be eternally grateful.
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