ABS case to print with 3D printer - can I reduce the size of the coil?

[Furini]

Good morning to all fellow enthusiasts who, like me, love metal detectors—especially the challenge of getting them working right, building them by hand, fine-tuning the device, and—above all—heading out into fields and forests dreaming of finding a relic or even a forgotten treasure! I’ve built several metal detector models, starting with the "Tarsos" (designed by Sacho Varna—or *Emekli Amca*; I don't quite recall the author). I built the TGSL following all the forum guidelines, and I’m especially grateful to the great master Ivconic for his immense help and for the humility and camaraderie he showed in sharing the results of his valuable, hard work—covering everything from the underlying electronics and physics principles (electric and magnetic fields, noise, converters, op-amps, etc.) to practical application. I also can't forget other gurus like Carl-NC, KT315, Qiaozi, and so on. Next, I built the PI Africa (with an 80cm diameter coil), which detects metal at a range of one meter (like a Coke can). I also built the IDX Pro, which I’m still fine-tuning because it isn't detecting very well—possibly due to the quality of the op-amps, an assembly error on the board, or an issue with how the coil was made. Finally, I’m currently building the IGSL, which is my biggest challenge yet. Here is my question for the forum: Since I own a 3D printer—and haven't been able to buy one with a larger print bed (ugh, lol)—I’d like to know if I can scale down the standard coil sizes (normally around 270mm in diameter) to a maximum diameter of 220mm. I want to maintain the same inductance and frequency as the originals so I can 3D print a coil mount or housing (in ABS or PLA) to keep the coils securely seated. Right now, I’m gluing the coils to a plastic paint bucket lid (lol), and the coil keeps deforming, which throws off the detector's calibration. I’d appreciate it if anyone could help! Warm regards to everyone. Apologies if the Google translation didn't come out very clearly...

[Carl-NC]

You can make the coils any size you want. Just adjust the windings to maintain about the same inductance.