The garage journal

Make the part your car is missing.

Practical field notes for printing replacement parts, choosing materials, dialing in a printer, and turning a broken plastic piece into a tested fit.

Start with the guides Explore the STL library

Community STL files: 1,000+
Materials made practical: PETG–ASA
Automotive focus: Real fit
Open parts library: Free

Latest from the workshop

Guides, tests & hard-won fixes

Written for the moment between finding a broken part and holding a replacement that actually fits.

Workshop guide

Issue 01

How to Make Money 3D Printing Car Parts

Make money 3D printing car parts with original STL files: what sells, paid downloads, Stripe payouts, safety limits, and seller CTAs.

33DPrintedCarPart

July 9, 2026

Workshop guide

Issue 02

25 Car-Part STL Ideas You Can Design and Sell

Find car-part STL ideas to sell: trim clips, caps, bezels, brackets, adapters, holders, restoration pieces, and IP-safe paid listing tips.

How to Price Paid STL Files for Car Parts

Price paid car-part STL files by buyer value, rarity, fitment proof, support burden, platform fee, Stripe adjustments, refunds, and trust.

From Broken Trim Clip to Sellable STL: A Creator Workflow

Turn a broken trim clip into a sellable STL: measure, CAD, test-print, document fitment, avoid safety/IP risks, and submit for review.

How Stripe Connect Payouts Work for STL Sellers

Stripe Connect for STL sellers: Express onboarding, paid download checkout, 20% platform fee target, entitlement access, refunds, and disputes.

A 3D Printing Side Hustle for Car Enthusiasts

Build a 3D printing side hustle for car parts with original STLs, niche fitment knowledge, free uploads, paid listings, and no inventory.

Legal and IP Checklist Before Selling Car-Part STLs

Sell car-part STLs legally with an IP checklist: original files, licenses, OEM logos, safety-critical parts, attribution, and review limits.

Free vs Paid STL Files for Car Parts: When to Charge

Choose free vs paid STL files for car parts: use free uploads for reach, paid downloads for original tested designs, and avoid risky paywalls.

How to Make STL Listings Buyers Trust

Sell STL files online with trusted listings: clear titles, fitment, photos, print notes, material limits, refunds, and honest compatibility.

Sell Automotive STLs Without Shipping Inventory

Sell automotive STLs without shipping inventory: digital paid downloads, fitment trust, Stripe checkout, seller review, and support limits.

How to Design 3D Printed Car Parts: The Complete CAD Guide for Automotive Makers

Master automotive CAD design from complete beginner to confident designer. Learn software selection, design principles, tolerances, step-by-step workflows, and advanced techniques for creating perfect-fitting car parts.

33DPrintedCarPart

15 Best 3D Printed Parts for Nissan Owners [240SX, 350Z, GTR & More]

Workshop guide

Issue 12

15 Best 3D Printed Parts for Nissan Owners [240SX, 350Z, GTR & More]

Complete guide to 3D printed parts for Nissan vehicles including 240SX, 350Z, 370Z, Skyline GT-R, Frontier, and more. Covers cup holders, gauge pods, HVAC vents, shift knob adapters, and NISMO Heritage Parts.

3D Printed Oil Catch Can Bracket: Complete DIY Guide [2026]

Learn how to 3D print custom oil catch can brackets for your engine bay. Complete guide covering ASA/PA-CF materials, design considerations, STL sources, print settings, and installation.

3D Printed Brake Bleeder Adapter: Complete DIY Guide [2026]

Learn how to 3D print brake bleeder adapters for pressure bleeding. Save 95% vs commercial kits. Material guide, STL sources, print settings, and safety tips.

3D Printed Car Battery Tray: Complete DIY Guide to Custom Mounts

Complete guide to 3D printing custom car battery trays for lithium conversions, Optima swaps, and classic car restoration. Covers materials (PA-CF, ASA), design principles, print settings, and installation.

3D Printed Car Steering Wheel Covers: Complete DIY Guide to Grips, Buttons & Accessories

Learn what you can actually 3D print for your steering wheel: TPU grips, button covers, paddle extensions, and center emblems. Complete material guide with ASA, ABS, and TPU comparisons.

3D Printed Car Glove Box Parts: Complete DIY Repair Guide [2026]

Learn how to 3D print replacement glove box parts including latches, hinges, dampers, handles, and custom organizers. Complete guide with materials, STL sources, and step-by-step instructions for any vehicle.

3D Printed Car Headliner Clips: Complete DIY Guide to Interior Fastener Repair

Learn how to 3D print car headliner clips that outlast OEM parts. Complete guide covers materials (ASA, ABS, Nylon), print settings, STL sources, and step-by-step installation.

How to 3D Print Car Armrest Parts: Complete DIY Guide [2026]

Learn to 3D print car armrest parts - complete replacements, organizer inserts, hinge repairs, and more. Covers ASA materials, CAD design, print settings, and cost savings of 85-95%.

33DPrintedCarPart

March 26, 2026