Prusa MINI frame and extruder screw size
M3 · 10 to 45 mm long
The screws used on Prusa MINI frame and extruder are M3 in lengths from 10 to 45 mm.
It is listed for frame, Y-carriage and extruder fasteners.
This entry is marked confirmed and comes from help.prusa3d.com.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Prusa MINI frame and extruder screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M3 | 10–45 mm | 0.5 mm | not stated | not stated | frame, Y-carriage and extruder fasteners | Confirmed |
Fitment records and sources
frame, Y-carriage and extruder fasteners
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Printer and CNC builds usually publish a bill of materials; when it lists a length, follow it, since extrusion T-nuts and motor faces have fixed thread depths.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 10–45 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- Pond/aquarium equipment manuals aimed at consumers rarely specify exact thread pitch or length for internal fasteners, since these are considered non-user-serviceable; distributor-level assembly/service manuals (e.g., Maytronics internal documents) are a better source than end-user guides.
- Grub screws (set screws) on sensor retainers are frequently M3 even when the surrounding housing uses M4/M5 fasteners — don't assume one thread size for a whole enclosure.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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M3 x 10mm Phillips Wafer Head Screw for Sim Racing Wheel Paddle Shifter - Single Replacement Black
$0.10 each · min. 50
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M3 x 10mm Phillips Wafer Head Screw for RC Car/Truck Chassis Mount - Single Replacement Black
$0.10 each · min. 50
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M3 x 12mm Phillips Wafer Head Screw for Camera Cage & Battery Slide Mount - Pack of 50 Black
$6.49 -
M3 x 12mm Phillips Wafer Head Screw for Electric Scooter LCD Dashboard - Single Replacement Black
$0.10 each · min. 50
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M3 x 14mm Phillips Wafer Head Screw for Camera Cage & Battery Slide Mount - Pack of 50 Black
$6.99 -
M3 x 14mm Phillips Wafer Head Screw for 3D Printer Extruder Stepper Motor - Single Replacement Black
$0.10 each · min. 50
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M3 x 10mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
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M3 x 12mm Phillips Wafer Head Screw for RC Car/Truck Chassis Mount - Single Replacement Black
$0.10 each · min. 50
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Devices whose records share a thread with Prusa MINI frame and extruder, closest length match first.
- VEX / Actobotics channel and gussets also M3 × 10–25 mm
- OpenBuilds gantry plate brackets also M3 × 10–16 mm
- NEMA 17 stepper motor face also M3 × 10 mm
- 2020 extrusion T-nuts (light duty) also M3 × 10–16 mm
- MGN12 linear rail also M3 × 10 mm
- Voron 2.4 gantry and carriage hardware also M3 × 10–30 mm
- Voron 2.4 / Trident also M3 × 10–30 mm
- Bambu Lab X1 / P1 / A1 frame and toolhead also M3 × 10–40 mm
Questions about Prusa MINI frame and extruder screws
- What size screw does Prusa MINI frame and extruder use?
- M3 × 10–45 mm for frame, Y-carriage and extruder fasteners.
- How long are the screws in Prusa MINI frame and extruder?
- The records range from 10 to 45 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Prusa MINI frame and extruder?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Prusa MINI frame and extruder?
- TechSpareWarehouse (our own store) lists M3 x 10mm, M3 x 12mm and M3 x 14mm, which match lengths in the records above.