This is an adaptation of a model from Cults3D from @Elpet,
Free 3D file Vallejo Style Wall Mount Paint Rack 36mm 🎨 ・3D printable model to download・Cults (cults3d.com)
Modified to allow me to put multiples in rows or stack them. I moved one of the wall mount brackets and created cut-outs for these to slide together.(tests pending)