I bought one of these side cutter "safety" can openers. Cutting through the can's rim requires more force than a regular can opener.
I'm not weak, but I like things to be easy, and sometimes operating this opener is a strain. So extending the handle for more leverage seemed like a possible solution.
The print has some spring to it, and fits securely over the slightly tapered handle, while being easy to remove. It probably won't fit anything else without modifications..
This opener is from Amazon. It is listed as: "ONME Can Opener, Manual Can Jar Opener, Smooth Edge Can Openers, Stainless Steel Can Opener" by ONME $5.99
16 grams ABS, 40 minutes, 0.3mm Z, medium fill with a raft.
I design in inches. If metric software imports a tiny file, try the included Metric .stl. The only difference is scaling. The factor is 25.4. (There are 25.4 millimeters to the inch.)