No-supports version, perfect to print in PETG.
Print instructions:
To assemble, just put all parts together, super easy.
Be aware that the square version has a larger opening, so it can fit slightly larger bags:
https://www.printables.com/model/668086-spring-loaded-bag-clip-with-fully-printed-mechanis
STEP file included. Feel free to remix and share, but please use the attribution feature.
Internal spring based on obijuan's design:
https://www.thingiverse.com/thing:21234
The author remixed this model.
The entire part was redesigned on a different shape so it could be printed horizontally without any supports. Internal parts were also adapted.