Carrera track connector
thingiverse
This is a replacement/spare part for the carrera track connectors. I recommend it in the provided orientation to have the best strength. Although laying it flat on the back may work, too. Supports are needed both ways. If you've printed this and it is a tight fit, give blister's remix a try, he gave the connections a bit more space: https://www.thingiverse.com/thing:3341752
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