First project: draw your own design or grab a free file?

I drew my own stuff from day one and I'd do it again, scrap wood and all. When I got my little 10W diode unit last winter I never even cut a downloaded file. First thing I made was a coaster with my dog's name on it, and I ruined three pieces of birch plywood getting the power and speed right for engraving. That cost me maybe six bucks of material, which felt like cheap tuition compared to what I learned. The reason I pushed myself to design early is that the machine side only makes sense once you have a reason to care. Kerf meant nothing to me untill I drew a box joint that wouldn't go together and had to shrink the slots by a fraction of a millimeter and try again. After two or three rounds of that I understood the whole picture, because I'd made the mistake myself instead of just reading about it. That said, there's no shame in a hybrid. My neighbor cuts files from thingiverse-style sites constantly and he's gotten excellent at dialing in settings for diferent materials. He just gets bored drawing. I get bored cutting things I had no hand in making. So honestly the right order depends on which part you actually enjoy. If the drawing is what pulled you toward the hobby in the first place, start there and accept the wastebasket full of test cuts.

I went the other way around, and honestly I think the downloaded files saved me from quitting. My machine is an older 40W CO2 unit I picked up secondhand, and for the first month I cut ornaments and puzzle files off a sharing site while I figured out how the thing actually behaved. I kept a spiral notebook next to the machine and wrote down every speed and power combo for each material, pine, 3mm ply, acrylic, so I built up a little reference before I ever drew a line myself. Once I started designing, that notebook did most of the heavy lifting. When I drew my first box joints I alredy knew how much the laser chewed away from each edge, so my first attempt actually fit. My neighbor wanted a simple shelf for his spice jars and I got it right on the second try. I do get the point about designing early teaching you why things fit. But for me the frustration of a cut that barely scorched the wood, or one that torched straight thru my honeycomb bed, woud have killed the hobby before it started. Cutting proven files kept the wins coming while I learned the machine's moods. The drawing part came easier later beacuse the machine side was already boring and predictable.

Agreeing with the second poster here, those downloaded files taught me the machine side without the heartbreak. I did the same thing with my little desktop unit, ran a bunch of free files for a month before touching the design software. The one thing that stuck with me most was learning that my beam cuts differently across the bed, left side burns deeper than the right. I only caught that because a shared ornament file kept coming out lighter on one corner and I had to actually hunt down why. Would never have noticed that on my own creations, I'd have just blamed my drawing.

I split the difference by re-drawing a downloaded file from scratch in my CAD program, measuring the joints with calipers and copying every slot, then cutting my version against the original to see which fit better. That exercise taught me more in one evening than a week of blind cutting, because I had to figure out why the designer made each choice. The pedantic part of me also insists you shold measure your actual material thickness with calipers rather than trusting the label, since nominally 3mm plywood is often closer to 3.2 and that alone will make tabs sloppy. Did your house file account for that, or did the joints just happen to land loose enough?

Funny timing reading this, because I've been doodling little shapes on graph paper all week trying to decide if any of them could become real cuts. I can barely draw a straight line by hand though, so I'm wondering how people even get their ideas into the computer in the first place. Is there a free program most folks start with for drawing simple shapes, or do you all pay for something proper?

For what it's worth, the line between the two camps blurs faster than you'd think. I started with downloaded files too, but within a couple weeks I was resizing every slot and adding my own little tabs, and eventually I'd changed so much I basicly owned the design. I run an 80W tube and found early on that most shared files assume a weaker machine, so you end up slowing everything down 20 percent anyway. So don't stress about which order. Just keep the scrap, because a stack of failed joints is honestly the best reference book you'll ever have. How thick is the ply you've been cutting?

Update: took the redraw suggestion from the fourth reply and it clicked for me. Picked one of the house files, measured every slot with calipers and drew my own version from scratch, then cut both and compared the fits. Mine needed a hair more clearance but it went together. Feels like I actually learned something this weekend instead of just running someone else's drawing.