Printed in PLA on Wanhao Duplicator I3 with compensation for normal line thickness. You must calibrate your printer before printing the LEGO compatible parts, 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. Drag the soldering-iron quickly over layer lines to increase resistance against impact, dirt and bacterias. Be careful not to overheat any region connected to LEGO, because 20 micrometers off will make it too loose or tight. Attach the Pi Zero using four M2 screws of 4-10mm length. Use nuts to shorten if you have longer screws than 4mm. Pick LEGO bottoms to solder onto any surface on the case. Align with LEGO pieces and a thin layer for error margins when soldering the first contact points. Use strings of the same filament from the brim to give additional strength along the seams where you don't need to place LEGO parts. Careful not to solder close to the actual LEGO. To use as a desktop during debugging or control a vehicle remotely, a wireless keyboard with built-in track pad allow using the Pi Zero without a bulky USB hub.