Printed in PLA on Wanhao Duplicator I3 with compensation for normal line thickness. You must calibrate your printer before printing the bottom, or it won't fit on your LEGO. Then measure to see if your settings need a modification to the inner and outer thickness to the model. Wait for the print to cool off and shrink, then use fine sandpaper until it fits with lego without seams. Hold your laser module in place when soldering the cylinder holders onto the lego mounts to make sure that it has the exact length. Wider modules will need more length because the conical inside is made to work with multiple dimensions without getting stuck. Drag the soldering-iron quickly over layer lines to protect against dirt and collisions.