Files (1)
Published material guidance; still check heat, UV, load, and printer compatibility.
A planning starting point only; wall count, orientation, and geometry often matter more than infill.
Slice the selected model with your final material, orientation, walls, and supports.
Saved setup guidance is used for material, infill, support, and per-file recommendation text; editable numbers are planning estimates only.
Reference shelf
Recommended filament for this print
Product references matched to the published material guidance. Confirm diameter, heat resistance, colour, and printer compatibility.
| Referenced item | What to verify | Price & availability |
|---|---|---|
| PETG filamentAmazon · Affiliate link | Amazon product page for 1.75 mm PETG; confirm colour, spool size, print temperature, seller, and delivery region. | Check price at Amazon |
| ASA filamentAmazon · Affiliate link | Amazon product page for 1.75 mm ASA; use an enclosure and suitable ventilation, and confirm seller and regional availability. | Check price at Amazon |
Affiliate disclosure: if you buy through an eligible link, 3DPrintedCarPart may earn a commission at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Confirm product specifications, compatibility, seller terms, and vehicle safety before ordering or using anything. Amazon may redirect you to a nearby supported store; otherwise the original Amazon.com page remains available.
Unsure which one fits? Read the automotive filament guide.
Smart fortwo Ignition Knob
Print this part
Use the part context as a starting point, then confirm geometry-dependent values in your slicer.
Files
1 hosted model file
STL
Material start
PETG or ASA for durability
Saved part guidance
Strength start
20-30% infill for a balance between strength and weight
Saved part guidance
Orientation / supports
verify in slicer
Exact totals
Slice for grams + time
Model geometry and final settings determine both
Vehicle exposure
Cabin/interior use; avoid high-heat zones
Open the STL, 3MF, or OBJ model in your slicer before printing. Exact grams, time, and final support placement come from the actual slice. Test-fit and heat-check the part before installing it in a vehicle.
License & use
The file license permits commercial reuse, subject to any applicable attribution or share-alike terms. License status does not verify vehicle fitment, OEM rights, design patents, or safety.
Shared by
3DPrintedCarPartDescription
I got this idea from an aluminum product sold in the UK. Yank your ignition key out of the key fob and stick it in this knob. It can now stay in the car, and most folks won't even realize the key is in the ignition. Most importantly, as Smart owners know, the remote is the immobilizer. Even if somebody were to try to start the car when you aren't around, it won't run. You can still lock the car, and basically forget the key even exists. Just unlock it, get in, and turn the knob. I set the tolerance based on my printer to be a semi-interference fit. No adhesive is required, there is enough friction to keep the key firmly in place. It's still removable with similar effort to removal from the factory key fob remote. If you want it made out of aluminum, here's a link to the UK product
Compatible Cars
Originally published on thingiverse.com by Ryan Riopel (Rioryan) · License: CC BY
Share whether this print actually fits a real car. Installed photos and material notes make the catalog more trustworthy.
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Finding specific fitment/category matches first.
