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A small alternation that took a bit more time than I thought 😅 So yes you can try printing the current ones really small but the spring will probably be to small and fragile to work properly. With this version I increased the size of the spring inside while leaving the box at the same size - I also removed the bolts, added a ring behind and changed the scale of the handle so it's not too fragile and a bit shorter. I printed 3 of these one at 90% (about 2.7cm in size!) and they all work.
Keep in mind that this is really tiny so printer has to be really tuned, Also because of the size I would assume results may vary depending of PLA type and printer settings in terms of how smooth the handle will really work.
They too have internal 1-string "supports" to keep the spring and handle in place. If you want them printed then change wall generator type to Arachne in Bambu slicer - I printed one without and it also worked, so your choice.
When print is done push the handle inwards to release it.