Leveling feet with centre holes
thingiverse
The chassis on the Geeetech A30T I got rocks on a flat surface. I have always put a little shim there. I saw these and modified the pieces to accept a screw and the rubber foot from the bottom of the machine base. I will set the base solid and not be messing around with a shim. and as an added bonus, there is better airflow through the chassis for cooling.
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