A subway tunnel that is free for all :) 2014-05-23 Due to problem with strength of the male-end I have added a connector, just print two female ends and us the connector it if you whant. 2013-12-23 Updated the entrance parts, the new parts got better clearance to the tunnel for better fitting. 2014-01-01 Added the tube split in two parts so it now only requires ~90 mm of z-height. Just glue them together to a full 175 mm tube.I have printed all parts with supports and 15% infill. I hade some problem with layer delamination on the tunnel but it is easy repaired with some super glue.