Frequently Asked Questions

Most MR129 products come in two versions. Ready-to-Install is a physical part, custom 3D printed to order and shipped to you. Digital STL is the 3D print file only — no physical product is shipped; you 3D print it yourself. The product title always says which version you're buying, so check it before you order.

Most likely you purchased the Digital STL version. Digital orders are delivered as a download (link in your confirmation email and on your account order page) — there is no shipment and no tracking number. If you meant to order the physical part, it is the separate Ready-to-Install listing on the same product family; email us and we'll point you to it — and if you bought the digital file by mistake and wanted the physical version, you can pay the difference.

They're the same design, two ways to buy it: the Digital STL (you download and 3D print it yourself) and the Ready-to-Install physical part (we 3D print it and ship it to you). The title of each listing says which one it is.

Every MR129 design starts as our own CAD work for the R129 chassis. Ready-to-Install parts are custom 3D printed to order — nothing is pulled off a shelf. The product page states whether production is by our U.S. Production Partner (20–30 days) or In-House (1–7 days).

No. Parts come in their 3D printed finish, unpainted. Many customers install them as-is; for a painted, body-color finish, prep and paint are yours or your body shop's.

No — multi-piece parts ship unassembled, as printed sections with alignment pins/rods where the design uses them. Assembly, joining, bonding and paint prep are done by you or your local body shop. Shipping parts unassembled is standard practice and protects them in transit.

No. Renders and photos show the part fitted to the car's factory panel so you can see the finished look. You are buying the part itself (for example, the rear lip only), not the bumper it is shown on.

Product titles start with the platform code: PFL = Pre-Facelift (1989–1995), FLN = Facelift Non-Sport (1996–2002), FLS = Facelift Sport (1996–2002). Match the code to your car before ordering. If you're not sure, contact us first.

Yes — it directly replaces Mercedes parts 1296700108 (left) and 1296700208 (right), for all R129 models 1989–2002. It's a 3-piece assembly with the rubber grill included: $260 for the pair or $170 per side, Ready-to-Install. (Also available as a digital STL.)

You use your existing 3rd brake light. If you buy the digital file, it includes an optic lens that installs over the original light.

Lips, skirts and spoilers are add-on parts designed around the car's factory panels and mounting points. Always test-fit every part before any finishing or paint work. Assembly and finishing are typically handled by a body shop: sections are sanded, bolted/bonded together, then prepped and painted.

MR129 aero parts are designed and sold for off-road, motorsport and show use only, unless a product page states otherwise.

No — we do not currently issue formal material certificates for our parts. They are 3D printed and sold for off-road and show use.

Every physical part is made to order first: Production Partner 20–30 days, or In-House Production 1–7 days, per the option on the product page. Shipping comes after production.

Shipping is calculated at checkout with live carrier rates for your address. Add the item to your cart and go to checkout — the exact total shows before you pay. We don't quote shipping by email.

Yes — most countries worldwide; checkout shows the options for your destination. One exception: we do not ship to China.

A download of the 3D print files for that design: a multi-piece version for smaller 3D printers and a single-piece version for larger machines. No physical product is shipped.

Most designs are made for a printer around 240–256mm build volume — a Bambu Lab P1S or X1C is typical. Some larger parts are designed for bigger beds and will not fit a 220mm printer; the multi-piece versions exist for exactly that reason. The product page states the requirement where it matters.

Follow the product page for the specific part — it states the recommended material for that design. Flexible and rubber portions print in TPU. The Windshield Cowl Rain Guard's main body is a carbon fiber plastic and its rubber portion is TPU.

Your download link is in your order confirmation email and on your account order page on mr129.com. If it still isn't working, email us and we'll send the files directly to you.

Personal use: 3D print the design for your own car and projects. Non-transferable — you can't share, resell or redistribute the files, and you can't sell parts printed from them.

One purchase includes lifetime updates — if we revise a design, the updated files are sent to you free. (That's why you may occasionally get an "update available" email for a file you bought a while ago.)

A 3D scan of an original part, sold for reverse engineering and design work. Reference files are not 3D printable. If you want a design you can 3D print, buy the Digital STL version.

No — all digital sales are final. If you're unsure which version you need, ask us before you buy.

Only until production begins; made-to-order parts can't be cancelled or changed after that. See the Refund Policy.

Contact us within 7 days of delivery, with the part uninstalled and unmodified, and we'll make it right.

Email mr129shop@gmail.com or the Contact page. For a custom body kit project, use the Custom Body Kit request form.