Gear for the garage, the toolbox & everyday carry.
Small-shop 3D printing out of Michigan. Every printed piece is designed, printed, and shipped by R.J.C. Additives — no warehouses, no middlemen.
Shop best sellers Full Etsy shopPrinted gear
Printed in-house and shipped free in the US. Checkout is handled securely on Etsy.
3D Printed Sneaker Keychain
Mini shoe keychain for sneakerheads — backpack charm, party favor, and stocking stuffer in one. Pick your color.
Magnetic Toolbox Cup Holder
Sticks to your toolbox and holds your drink, your phone, and the bolts you would otherwise lose. Every tech needs one.
Lip Balm Holder Keychain
Textured chapstick case with charm — heart, flower, or butterfly. Your lip balm stops disappearing into the truck console.
Halloween fishing hoodies
Skeleton crew energy for the night bite. Printed on demand on Gildan heavy blend hoodies, S–3XL.
Hooked on Nightmares Hoodie
The one that started it. A nightmare bite on a black heavy blend hoodie.
Printable wall art — instant download
Buy once, print at home, frame it in the garage tonight.
Garage Wall Art Bundle
Ten printable man-cave and garage signs in one pack.
Funny Garage Warning Signs Bundle
Warning signs your shop actually deserves.
About the shop
R.J.C. Additives is a one-bench 3D-printing shop in Michigan making useful, giftable gear for people who work with their hands — mechanics, anglers, sneakerheads, and garage dwellers. Printed orders ship free in the US, and every order is backed by a 30-day return window through Etsy.