Review on 🔪 Dremel 678 Circle Cutter and Straight Edge Guide: Rotary Tool Attachment for Dremel Models 4300, 4000, 3000, and 8220 by Nelson Calafell

I used it to cut holes in a 1/8" sheet of MDF to use as a template and two 1/4" thick sheets of 6061 aluminum. You really need to make sure all the screws are tight or you'll end up with a lot of wobbling. Don't use this if you really need to use circles. The actual hole is cut more accurately than the rest of the material. You're more likely to ruin circles than holes. Do this slowly and hold the tool steady, otherwise the Dremel bit may catch on the material and ruin the cut. The drill that comes with the tool corrodes wood very easily, but when working with metal you must be patient and work very slowly or the drill may break. The description says you can cut up to 3/4" in diameter, but the smallest I was able to cut was just over 2" in diameter. The screws on the tool holder interfere with the center pin which makes the tool really wobbly and unstable when I choose a size smaller than 2". The plastic holder that you screw the tool into is very flimsy and easily breaks if you accidentally overtighten it. your instrument. Also, the mechanism for adjusting the instrument's height is quite flimsy and doesn't seem very reliable. I get strong vibrations in the instrument if I set the pitch too high, but that could also be because I mainly work with aluminum 6061. In general it's not bad if you want it to be fast and cheap, but for anything serious If work is required, just use a drill or even better a router, you'll save some time and do a better job.