Trolley Chain Key
thingiverse
Bring a coin or printed substitute to engage this key and release it, searching keywords "trolley key". July 28, 2017 Update Added a version without built-in support. August 4, 2018 Update Added versions without the hole. This modification was requested by a gracious maker but doesn't work for me. The hole seems necessary to allow the lock to complete its rotation and release the coin. Print Settings: Printer: FlashForge Creator Pro Rafts: No Supports: Yes Resolution: 0.20 mm or finer is better. Infill: 25% Notes: Support for the key end is built into the model, connected by an array of dots. Take care when removing support.
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