Morse code practice key

I needed a simple, all in one practice key that I could use to introduce some high school students to sending and copying Morse code. This design is a riff on the design by guypl who made a single print version which used a single AA battery and a 3V active buzzer this is inexpensive and easy to source on Amazon (the 1.5 V battery operates the 3V buzzer just fine). https://www.amazon.com/QMseller-Terminals-Raspberry-Electronic-Continous/dp/B07VRK7ZPF/ref=sr_1_3?crid=3LWJQWUADY7GB&dib=eyJ2IjoiMSJ9.qEyzL2ee01JGpGr1tGW-e94aTit5t4aWyuYZkXv1Y8yh7KPiwGtALdsYItz2UTKfWGIwqjUVpEsi2YboE6acLARA0dkLXV1cD-q3Po_g-bWJaP-12oB4CC4mhIyTI9k-oxEntnZEzk7Uf_9hoVqix_FU6n4OeiA8m5ddLjODhroWp1jlqqPT6GFo858JJYxyTowrsh9SuQfKclwyQRYkyGvGv_4N4rIgIAen55w87Bg.HhgnilqMD3zhG3o7id7mAXcJzh0czJFKSwkHsLSIPWU&dib_tag=se&keywords=3v+active+buzzer&qid=1774447135&sprefix=3v+active+buzzer%2Caps%2C279&sr=8-3 I found that design a little tough to wire up using paper clips as directed and so made some modifications that make it easier to get solid connections between the battery, the buzzer and the key. The tradeoff is that it is two prints, uses scrap electrical wire rather than paper clips, needs three M3 x 6mm screws and solders the wires to the buzzer leads (although, you might be able to use alligator clip test leads to accomplish this hookup without soldering). A few assembly notes: I printed this on a Bambu p2s I chose 30% infill and 4x wall loops to make sure the screw holes had good strength. I designed in a small channel into the wall of the screw hole so that the stripped wire could just be inserted into the screw hold and held in place by the screw (earlier versions didn't have a channel, but it kept shearing the wire off). Positive battery contact is achieved by shaving the insulation off the wire once its been routed through the holes in the battery holder. So far this has been very effective at producing good contact without needing to add any metal springs. The larger holes in the bottom of the base are to make it easy to push out the battery or buzzer when they need to be removed. The design should work with a wide range of scrap wire 16-22 gauge so don't stress about getting "the right type" of wire. In the pictures I've used some scrap 16 gauge, stranded wire left over from wiring my boat trailer lights.