Was it X or Y axis that missed steps?
There are two main causes of missed steps. Loose pulley causes sudden shifts. Rubbing/friction causes gradual shifts like this. If it's a UM1 it's almost certainly the rubber belt rubbing against the wood frame - you can tell because it twists back and forth each time it changes direction. Fix by adding washers under the 4 black plastic spacers and possibly also taking the motor off and moving the pulley even closer to the motor (should be very close - about 1/2mm).
If UM2 it's also usually rubbing pulley or belt but usually right at the motor pulley. In that case the only solution I'm told is to move the pulley along the shaft closer to the motor.
I was totally a slightly loose hex. All fixed now. thanks Illuminarti
On the pulley? really? That's really good to know for future as someone asks every week almost.
What sort of printer is this?
Most likely you either have loose one or more loose pulleys, or the short belts are catching on the frame somehow.
Please post photos.
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