Here’s a list. Note that there’s a decent amount of fragmentation due to multiple communities filling the same niche in different instances, as well as sub communities (see: functional printing and fix my print vs 3D Printing and birding and travel photography vs photography)

• !woodworking@lemmy.ca (2.02k subscribed, 70 users/month)
• !luthier@lemmy.world (174 subscribed, 2 users/month)
• !3dprinting@lemmy.world (I made a lot of my own designs and post some there) (13k.7 subscribed, 338 users/month)
• !3dprinting@lemmy.ml (842 subscribed, 44 users/month)
• !functionalprint@kbin.social (1k subscribed, 10 users/month)
• !vorondesign@lemmy.world (make your own 3D printer and modify it to there and back (271 subscribed, 2 users/month)
• !diyaudio@sh.itjust.works (65 subscribed, 1 user/month)

Not so much “I made”, but related:

• !gardening@lemmy.world (2.27k subscribed, 14 users/month)
• !photography@lemmy.world (3.81k subscribed, 49 users/month)
• !photography@lemmy.ml (925 subscribed, 32 users/month)
• !birding@lemmy.world (2.81k subscribed, 94 users/month)
• !travelphotography@lemmy.world (1.68k, 2 users/month)
• !sonyalpha@lemmy.world (145 subscribed, 1 user/month)

How about you? Always looking for communities for things I’m interested in. My default sort is subscribed + new.